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A 65 kg man is riding a Ferris wheel with radius of 15 m, that moves at 1.5 rpm…

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Wize University Physics Textbook (Master) > Circular Motion

Centripetal Acceleration and Centripetal Force

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Wize University Physics Textbook (Master) > Work and Energy

Conservation of Energy

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Wize University Physics Textbook (Master) > Newton's Laws of Motion: Forces and Dynamics

Free Body Diagrams

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A 65 kg man is riding a Ferris wheel with radius of 15 m, that moves at 1.5 rpm. Determine the normal force that the man experiences at the top of the ferris wheel and at the bottom.

Top normal force
More Centripetal Acceleration and Centripetal Force Questions:
Two strings on a spinning rod - solving
Practice: Two Strings on Spinning Rod
The 4.00-kg block in the figure is attached to a vertical rod by means of two strings. When the system rotates about the axis of the rod, the strings are extended as shown in the diagram and the tension in the upper string is 80.0 N.
Vertical circular motion
Practice: Vertical String
A box of mass 2.50 kg is attached to a string and whirled in a vertical circle of radius 1.0 m. At the exact top of the path, the tension in the string is 3 times the ball’s weight.
Ball on a string at an angle
Practice: Ball on String at an Angle
A 2.0 kg ball is suspended by a 1.20 m long string. A girl grabs the string and swings it downwards in front of her at a constant speed. The string makes an angle of 35º with the vertical. Determine the speed of the ball.
Because of Earth's rotation about its axis, a point at the poles has no centripetal acceleration. (Assume Earth is a uniform sphere and take g=9.800 ms2. g=9.800\ \frac{m}{s^2}.\ )
A wheel of radius 14.0 m is turning about a horizontal axis through its center. The linear speed of a passenger on the rim is constant and equal to 7.00 m/s.
(a) What are the magnitude and direction of the passenger's acceleration as she passes through the lowest point in her circular motion?
(b) Repeat part (a), but for the highest point instead of the lowest.
Ball on a string at an angle
A 2.0 kg ball is suspended by a 1.20 m long string. A girl grabs the string and swings it downwards in front of her at a constant speed. The string makes an angle of 35º with the vertical. Determine the speed of the ball.
A puck of mass m slides on a frictionless table while attached to a hanging cylinder of mass M by a cord through a hole in a table. What is the angular momentum of the puck?
(Hint: find the speed of the puck by considering uniform circular motion - what is the force providing the centripetal acceleration?)
Practice: Sliding off of a globe
A child is sliding on a spherical pile of snow of radius R. The child is initially at rest at the very top of the hemisphere, but is given a slight push to start sliding down. Neglect friction.
Energy conservation and circular motion
A compressed spring is used to propel a 25-gram ball-bearing along a frictionless horizontal track which contains a circular vertical loop of radius 0.30 m in a vertical plane. The spring obeys Hooke's law and is compressed 20 cm by a force of 5.0 N.
a) What is the speed of the ball-bearing at the top of the loop? Treat the ball bearing as a point mass.
b) What is the minimum spring compression required to have the ball-bearing complete a full loop?
Tension and centripetal force
The 4.00-kg block in the figure is attached to a vertical rod by means of two strings. When the system rotates about the axis of the rod, the strings are extended as shown in the diagram and the tension in the upper string is 80.0 N.
Two strings on a spinning rod - setup, approach
The 4.00-kg block in the figure is attached to a vertical rod by means of two strings. When the system rotates about the axis of the rod, the strings are extended as shown in the diagram and the tension in the upper string is 80.0 N.
Set up the problem (a free-body diagram, find unknown angles and distances, define coordinates) and then go to the next activity. Ask yourself: how do we deal with the rpm quantity in part (b)?
Vertical circular motion
A box of mass 2.50 kg is attached to a string and whirled in a vertical circle of radius 1.0 m. At the exact top of the path, the tension in the string is 3 times the ball’s weight.
For the following systems, draw free-body diagrams and explain what real force(s) is/are providing the centripetal force.
The moon orbiting around the earth
Being in the Gravitron amusement ride (inside, the people are stuck against the walls while the ride spins extremely fast - see picture below)
A small car with mass 0.800 kg travels at constant speed on the inside of a track that is a vertical circle with radius 5.00 m (Fig.). If the normal force exerted by the track on the car when it is at the top of the track (point B) is 6.00 N, what is the normal force on the car when it is at the bottom of the track (point A)
Driving in a circle
You are driving around a sharp corner, going clockwise. There is a box in the middle of your back seat. If you are driving fast enough, the box will slide to a side of your car. Which side will it slide to? Why?
(Hint: even if questions do not ask you to draw a sketch or picture, you should draw one anyway! It makes life easier for both you and the exam marker.)
air puck problem
An air puck of mass m1=0.25 kg{\small m_1=0.25\ kg} is tied to a string and allowed to revolve in a circle of radius R = 1.0 m on a frictionless horizontal table. The other end of string passes through a hole in the center of the table, and a mass of m2=1.0 kg{\small m_2=1.0\ kg} is tied to it (Fig.). The suspended mass remains in equilibrium while the puck on the tabletop revolves.
Ball on a string at an angle
A 2.0 kg ball is suspended by a 1.20 m long string. A girl grabs the string and swings it downwards in front of her at a constant speed. The string makes an angle of 35º with the vertical. Determine the speed of the ball.
Circular Motion
A 20-g marble is free to slide on a frictionless wire loop with radius of 15 cm. The loop starts to rotate about its vertical axis until the bead slides up to θ=60∘ as shown below. What is the angular velocity of the loop at this moment?
A point object travelling in a circle must always have a net force acting on it.
Centripetal force
When an object experiences uniform circular motion, the direction of the net force is
A ball of mass 5 kg and charge Q is performing uniform circular motion on a horizontal surface. The radius of rotation is R=1m and the period of rotation is T=5 s.
If the ball is attached to a spring with equilibrium length of 0.5 m, what is the spring constant?
Assume we put another charge with the same magnitude at the origin for maintaining the circular motion. What is the type and magnitude of the charge?
The 4.00-kg block is Fig. is attached to a vertical rod by means of two strings. When the system rotates about the axis of the rod, the strings are extended as shown is the diagram and the tension in the upper string is 80.0 N. (a) What is the tension in the lower cord ? (b) How many revolutions per minute does the system make ? (c) Find the number of revolution per minute at which the lower cord just goes slack. (d) Explain what happens if the number of revolutions per min is less than in part c.
In the 'Giant swing' , the seat is connected to two cables as shown in Fig. , one of which is horizontal.The seat swings in a horizontal circle at a rate of 32.0 rpm (rev/min).If the seat weighs 255 N and an 825 N person is sitting in it, find the tension in each cable.
A boy standing in one spot swings a box on a string in a horizontal circle of radius 2m around him as fast as he can. If the force of tension in the string is 100 N and the mass of the box is 30kg, how fast is the box moving? How many revolutions per minute does it make?
A ball of mass M is released from rest at a vertical height h above the ground. The ball rolls down a frictionless inclined plane and makes it to a loop the loop of radius R.
What is the velocity of the ball as it reaches to the bottom of the incline?
What is the normal force at the bottom?
A 2.0 kg ball is suspended by a 1.20 m long string. A girl grabs the string and swings it downwards in front of her at a constant speed. The string makes an angle of 35º with the vertical. Determine the speed of the ball.
If the angle that the string makes with the vertical increases, what happens to the ball speed?
Vehicles must be able to traverse a curve of radius 60.0 m safely at speeds up to 80 km/h. If the average vehicle weighs 1000 kg, what minimum coefficient of friction is required to make this possible?
A boy standing in one spot, swings a box on a string in a horizontal circle with the radius of 2m around him as fast as he can. If the force of tension in the string is 100 N and and the mass of the box is 30kg, how fast is the box moving? How many revolutions per minute does it make?
More Conservation of Energy Questions:
conservation of energy
Practice: Conservation of Energy
A 2 kg2\ kgboy is dropped by firefighters from a height of 10 m10\ m to be caught by a team of rescuers on the ground. Determine the velocity of the boy before he reaches the ground level.
work and energy
A 1.60-m tall person lifts a 2.10-kg book from the ground so it is 2.20 m above the ground. What is the potential energy of the book relative to
(a) the ground
(b) and the top of the person’s head?
Problems on Work and Energy
A 2.00-kg block is pushed against a spring with negligible mass and force constant k= 400 N/m, compressing it 0.220 m. When the block is released , it moves along a friction-less , horizontal surface and then up a friction-less incline with slope 37.0∘37.0^{\circ}(Fig).
(a) What is the speed of the block as it slides along the horizontal surface after having left the spring?
(b) How far does the block travel up the incline before starting to slide back down?
Problems on Work and Energy
A 2.00-kg block is pushed against a spring with negligible mass and force constant k= 400 N/m, compressing it 0.220 m. When the block is released , it moves along a friction-less , horizontal surface and then up a friction-less incline with slope 37.0∘37.0^{\circ}(Fig).
(a) What is the speed of the block as it slides along the horizontal surface after having left the spring?
(b) How far does the block travel up the incline before starting to slide back down?
work and energy
A 1.60-m tall person lifts a 2.10-kg book from the ground so it is 2.20 m above the ground. What is the potential energy of the book relative to
(a) the ground
(b) and the top of the person’s head?
Example: Releasing two repulsive charges (harder)
EX: Two point charges are 20 cm apart and each carry 3 µc of positive charge. At a moment, they are released to move along connecting line, repelling each other. What is the velocity of the charges when they are 60 cm apart? Consider the mass of the charges to be 0.3 grams. Give your answer in m/s.
Graphical problem
Practice: Graphical Problem of Conservation of Energy
A 1.2-g particle is moving along x-axis under the influence of the following potential energy. The particle turns around at x=6mx=6m. What is the maximum speed of this particle?
Problems on Momentum Conservation and Collisions
Practice: Conservation of Momentum with Spring
A 15.0-kg block is attached to a very light horizontal spring with spring constant 500 N/m and is resting on a friction-less horizontal table. It is struck by a 3.00-kg stone traveling horizontally at 8.00 m/s to the right. The stone rebounds at 2.00 m/s horizontally to the left. Find the maximum distance that the block will compress the spring after the collision. Enter the answer with 3 significant digits.
Problems on Work and Energy
Practice: Block with Spring and Ramp
A 2.00-kg block is pushed against a spring with negligible mass and force constant k= 400 N/m, compressing it 0.220 m. When the block is released , it moves along a friction-less , horizontal surface and then up a friction-less incline with slope 37.0∘37.0^{\circ}(Fig).
(a) What is the speed of the block as it slides along the horizontal surface after having left the spring?
conservation of energy
Practice: Conservation of Energy
A 2 kg2\ kgboy is dropped by firefighters from a height of 10 m10\ m to be caught by a team of rescuers on the ground. Determine the velocity of the boy before he reaches the ground level.
conservation of energy
Practice: Conservation of Energy
A 2 kg2\ kgboy is dropped by firefighters from a height of 10 m10\ m to be caught by a team of rescuers on the ground. Determine the velocity of the boy before he reaches the ground level.
Releasing two repulsive charges
Two point charges are held 20 cm apart and each carries 3.0 µc of positive charge. At the same time, they are released, and they begin to move straight apart from each other. What is the velocity of the charges when they are 60 cm apart? Consider the mass of the charges to be 0.3 grams. Give your answer in m/s.
conservation of energy
Practice: Conservation of Energy
A 2 kg2\ kgboy is dropped by firefighters from a height of 10 m10\ m to be caught by a team of rescuers on the ground. Determine the velocity of the boy before he reaches the ground level.
Practice: Spring constant
A 300-gram ball starts to roll down 4 meters on a 30 degree incline. (That is, the distance it travels along the slope is 4 meters.) The ball then rolls 2 meters on flat surface and hits a plate, connected to a spring. The spring is compressed 25 cm. If the kinetic coefficient of friction of all surfaces is 0.1, what is the spring constant?
Conservation of energy
A 1.2-g particle is moving along x-axis under the influence of the following potential energy. The particle turns around at x=6mx=6m. What is the maximum speed of this particle?
A 2 kg2\ kgball is dropped from a height of 10 m10\ monto the ground.
a) If the balls experiences no losses find the velocity of the ball right before it hits the ground. (in m/s)
b) If the ball loses 25% of its energy when it bounces, what height will it reach on its first bounce? (in m)
Two balls of equal mass are thrown from the top of a building with height10.0m10.0 m. One is thrown straight up at 10 m/s10\ m/s(call this ball A) and the other is thrown horizontally at 10 m/s10\ m/s (call this ball B).
a) Which balls has a greater speed when it reaches the ground? Why? Make sure you include conservation of energy in your answer.
b) Your friend tries to tell you that the ball thrown horizontally would have greater speed, because it has both an x-component and a y-component, and so the speed (magnitude of the velocity) should be higher. Why is he wrong? (Calculation not required, but you can do one if you want.)
A marble starts from rest and rolls without slipping on the loop-the-loop track in the figure. Find the minimum starting height h from which the ball will remain on the track throughout the loop. Assume the marble's radius is small compared with R. The moment of inertia for a solid sphere is 25Mr2\frac25Mr^2.
Find your answer by using R = 70 cm (radius of the loop) and r = 1.0 cm (radius of the marble).
The system below initially starts from rest, with a spring constant of 28 N/m.
At t = 0, the 3 kg block is removed. If the 2 kg block is not attached to the spring:
A box of mass m is pressed against (but is not attached to) an ideal spring of force constant k and negligible mass, compressing the spring a distance x. After it is released, the box slides up a frictionless, smooth incline, as shown in the figure, and eventually stops after reaching a certain height.
If we repeat this experiment but instead compress the spring a distance of 2x, what will happen? Explain your answer.
A spring with a spring constant k=340 N/m is used to launch a 1.5kg block along the horizontal surface whose coefficient of kinetic friction is 0.27. If the spring is compressed 18cm, how far does the block slide?
A frictionless roller-coaster track is guiding a car from point A to point D as shown below. The car at A is at rest and slowly starts its journey. Which set of energy diagrams does correctly represent the energy at indicated points?
A mass is on a spring. The spring is stretched and then released so that the mass bounces back and forth. There are no other forces in the system. At what point is the block moving the fastest?
A 20.0kg cart is moving at 10.0m/s before it goes down a hill. It ends up 2.0m below where it started, and travelled a distance of 15.0m. What is the speed of the car? There is friction, and it applies an average force of 2.00N over the course of it's motion.
Give your answer in m/s.
Problems on Work and Energy
A 2.00-kg block is pushed against a spring with negligible mass and force constant k= 400 N/m, compressing it 0.220 m. When the block is released , it moves along a friction-less , horizontal surface and then up a friction-less incline with slope 37.0∘37.0^{\circ}(Fig).
(a) What is the speed of the block as it slides along the horizontal surface after having left the spring?
(b) How far does the block travel up the incline before starting to slide back down?
Graphical problem
A 1.2-g particle is moving along x-axis under the influence of the following potential energy. The particle turns around at x=6mx=6m. What is the maximum speed of this particle?
Problems on Momentum Conservation and Collisions
A 15.0-kg block is attached to a very light horizontal spring with spring constant 500 N/m and is resting on a friction-less horizontal table. It is struck by a 3.00-kg stone traveling horizontally at 8.00 m/s to the right. The stone rebounds at 2.00 m/s horizontally to the left. Find the maximum distance that the block will compress the spring after the collision. Enter the answer with 3 significant digits.
Two cylinders of the same size but different masses roll down an incline, starting from rest. Cylinder A has a greater mass. Which reaches the bottom first?
conservation of energy
A 2 kg2\ kg ball is dropped from a height of 10 m10\ m onto the ground. If the balls experiences no losses find the velocity of the ball right before it hits the ground. If the ball loses 25%25\% of its energy when it bounces, what height will it reach on its first bounce?
work and energy
A 1.60-m tall person lifts a 2.10-kg book from the ground so it is 2.20 m above the ground. What is the potential energy of the book relative to
(a) the ground
(b) and the top of the person’s head?
A box of mass m is pressed against (but is not attached to ) an ideal spring of force constant k and negligible mass, compressing the spring a distance x. After it is released, the box slides up a frictionless incline as shown in the figure and eventually stops. If we repeat this experiment but instead compress the spring a distance of 2x.
A horizontal rod of length L and mass M has a mass m at one end. It is supported by pivot P on the wall at the left end and a cable at angle θ\theta of at the other end as shown.
a) Find the tension in the cable
b) If the cable snaps, with what angular velocity will the rod swing down and slam into the wall?
A pendulum with length of 0.80m is raised to an angle of 25° below the horizontal and released. What is the velocity of the pendulum as it swings past its lowest point?
A person with mass of 75kg is doing bungee jumping such that he jumps down from rest form the top of a bridge. If the natural length of the bungee cord is 20m and effective spring constant for this bungee cord is 5N/m, what is the speed of the person 20m below the bridge? What is the lowest position of the person respect to the bridge?
A marble starts from rest and rolls without slipping on the loop-the-loop track in the figure. Find the minimum starting height h from which the ball will remain on the track through the loop. Assume the marble's radius is small compared with R.
A ball of mass M is released from rest at a vertical height h above the ground. The ball rolls down a frictionless inclined plane and makes it to a loop the loop of radius R.
What is the velocity of the ball as it reaches to the bottom of the incline?
What is the normal force at the bottom?
A 200g mass block is released from rest at a height of 25 cm on 30o incline. The incline is frictionless. It slides down the incline and then a frictionless surface until it collides elastically with an 800g block at rest 1.4 m from the bottom of the incline as shown in the figure. How much later do the two blocks collide again?
A ball of mass 0.5 kg is attached to a string of length 26 cm. The ball is raised so that the string is taut and horizontal. Now the ball is released such that it swings and undergoes an elastic head-on collision with a stationary ball of mass 0.20kg that is free to roll horizontally. a) Find the speed of the swinging ball just before the collision. b) What is the speed of the 0.20 kg ball just after the collision?
A car accidentally enters a playing ground at a velocity of 14m/s. A child tosses a ball at the car at 18m/s. What is the ball's speed after it rebounds elastically from the car?
A ballistic pendulum is used to measure the speed of a bullet. It consists of a wooden block of mass M = 10kg suspended from a vertical string. A bullet of mass m = 100g strikes and embeds itself in the block and the block swings upward through a vertical distance of 0.10m. What is the bullet's speed?
A 12 g bullet moving horizontally at 30 m/s is fired into a vertically suspended pendulum of mass 2.5 kg. The bullet becomes embedded in the pendulum.
As shown below, a ball of mass m with an initial velocity 10 m/s collides with an initially stationary ballistic pendulum of mass M=3m, hanging from a string. The two sticks together and system deflects from vertical position to angleΘ=60∘\Theta=60^{^{\circ}} What is the length of string?
Mechanical energy
When a rollercoaster cart moves towards the ground, what happens to the PE that it has?
A block of mass m is released from rest at the top of a semi- circular frictionless track of radius R.
Which of the following expressions most accurately represents the speed of the block at the bottom of the track?
g is the acceleration due to gravity.
You drop a 5 kg ball from a height of 2 m. Just before it reaches the ground, how much kinetic energy ( in N) does it have?
Mechanical energy
An object is lifted to some height and then dropped. During the drop, which of the following is increased? Neglect air resistance.
Releasing two repulsive charges
Two point charges are 20 cm apart and each carry 3 µc of positive charge. At a moment, they are released to move along connecting line, repelling each other. What is the velocity of the charges when they are 60 cm apart? Consider the mass of the charges to be 0.3 grams. Give your answer in m/s.
Conservation of Energy & Momentum
A 12-g rifle bullet is fired with a speed of 380 m/s into a ballistic pendulum with mass 6.00 kg, suspended from a cord 70.0 cm long. Compute (a) the vertical height through which the pendulum rises , (b) the initial kinetic energy of the bullet, and (c) the kinetic energy of the bullet and pendulum immediately after the bullet becomes embedded in the pendulum.
A 15.0-kg block is attached to a very light horizontal spring of force constant 500 N/m and is resting on a friction-less horizontal table (Fig.). Suddenly it is struck by a 3.00-kg stone traveling horizontally at 8.00 m/s to the right, where upon the stone rebound at 2.00 m/s horizontally to the left.Find the maximum distance that the block will compress the spring after the collision.
A 5 kg chunk of ice is sliding at 12.0 m/s on the floor of an ice-covered valley when it collides with and stick to another 5.00-kg chunk of ice that is initially at rest.(Fig.) Since the valley is icy, there is no friction.After the collision, how high above the valley floor will the combined chunks go?
A 0.15 kg frame, when suspended from a coil spring, stretches the spring 0.070 m.A 0.200-kg lump of putty is dropped from rest onto the frame from a height of 30.0 cm(Fig). Find the maximum distance the frame moves downward from its initial position.
Two identical masses are released from rest in a smooth hemispherical bowl of radius R from the positions shown in Fig. You can ignore friction between the masses and the surface of bowl. If they stick together when they collide, how high above the bottom of the bowl will the masses go after colliding in terms of R?
A ball is thrown from the top of a 10m tall building with a speed of 5m/s. What is its speed as it hits the ground?
A frictionless roller-coaster track is guiding a car from point A to point D as shown below. The car at
A is at rest and slowly starts its journey. Which set of energy diagrams does correctly represent the
energy at indicated points?
A 1.2-g particle is moving along x-axis under the influence of the following potential energy. The particle turns around at x=6mx=6m. What is the maximum speed of this particle?
A compressed spring is used to propel a 25-gram ball-bearing along a horizontal track which contains a circular vertical loop of radius 0.30 m in a vertical plane. The spring obeys Hooke's law and is compressed 20 cm a force of 5 N. What is the speed of the ball-bearing at the top of the loop?
More Free Body Diagrams Questions:
Practice: Three books on a table
Three books are sitting at rest on a table.
a) Draw a sketch.
b) Draw a complete free-body diagram for each book.
Example Problem: force of tension
Two blocks of mass m1=2Kgm_1 = 2Kg and m2=3Kgm_2 = 3Kg linked by a string through a pulley, where the block of mass m1 slides on the frictionless table. We assume that the string is massless and the pulley is massless and frictionless
a) Find the magnitude of the acceleration of the two masses b) Find the tension in the string
Two tennis players are rallying a tennis ball. Draw a free body diagram for the ball when it is in flight between the two players. Neglect air resistance.
Practice: Three books on a table
Three books are sitting at rest on a table.
a) Draw a sketch.
b) Draw a complete free-body diagram for each book.
A 45 kg45\ kg man is standing in an elevator.
Draw a free body diagram of the system then determine whether the statements about the apparent weight of the man are true. Let upward be +y.
Practice: Inclined Plane Theory
Inclined Plane
Sliding down an inclined plane is another example of motion with constant acceleration.
Source of the motion is still gravity of earth but only part of it is affecting the sliding of the object
Two tennis players are rallying a tennis ball.
Describe the forces (draw a FBD) on the ball when it is:
a) In flight
A 2.0 kg ball is suspended by a 1.20 m long string. A girl grabs the string and swings it downwards in front of her at a constant speed. The string makes an angle of 35º with the vertical. Determine the speed of the ball.
If the angle that the string makes with the vertical increases, what happens to the ball speed?
A block of mass 4 kg is suspended on two strings between two walls. The angles each string makes below the horizontal is 30°. What is the tension forces in each string? Provide an answer in Newtons and 1 decimal place.
Normal force
A man pulls 200Kg crate with rope angles 30 o above the horizontal with force 200N. The crate sits on the frictionless surface. Calculate the normal force. Enter answer in N.
Example Problem: force of tension
Two blocks of mass m1=2Kgm_1 = 2Kg and m2=3Kgm_2 = 3Kglinked by a string through a pulley, where the block of mass m1 slides on the frictionless table. We assume that the string is massless and the pulley is massless and frictionless
a) Find the magnitude of the acceleration of the two masses b) Find the tension in the string
New Practice Question
An engineer plans to design a levitating piston which can support loads up to 500kg. He decides to make a cylindrical chamber with radius of 0.5m with a moving piston which weighs 20kg. The chamber is filled with 10 moles of a diatomic ideal gas which is initially kept at 200K. By adding loads on the piston, the gas underneath is heated such that the height of the piston remains unchanged. (Assume that heating process is happening extremely fast such that the height of the piston remains constant while the gas is heated)
a) When there is no load on the piston, what is the pressure of the gas inside the chamber?
b) What is the temperature of the gas when maximum load is added to the piston?