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Two tennis players are rallying a tennis ball. Describe the forces (draw a FBD)…

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

Normal Force

3 Activities

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

Free Body Diagrams

4 Activities

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Two tennis players are rallying a tennis ball.
Describe the forces (draw a FBD) on the ball when it is:
a) In flight
b) Being hit by a racket. How does the force the ball exerts on the racket compared to that of the racket on the ball (>, < or =).
More Normal Force Questions:
A 45 kg45\ kg man is standing in an elevator. Find his apparent weight in each case: (that is, find the normal force on the man in each case):
a) The elevator is traveling steadily at 3.0ms3.0\frac{m}{s}
b) The elevator is still.
Ferris wheel
A 65 kg man is riding a Ferris wheel with radius of 15 m, that moves at speed 2.355 m/s. Determine the normal force that the man experiences at the top of the ferris wheel and at the bottom.
A 45 kg45\ kg man is standing in an elevator. Find his apparent weight in each case: (that is, find the normal force on the man in each case):
a) The elevator is traveling steadily at 3.0ms3.0\frac{m}{s}
b) The elevator is still.
A person with a 50 kg50\ kgmass is standing on a scale in an elevator which moving upward.
a) What is the reading on the scale when the elevator moves upward with a constant velocity of 10 m/s10 \ m/s?
b) The elevator is going to stop with a deceleration of 4.0 m/s24.0 \ m/s^2. What is new reading on the scale?
Dave is standing on a scale in a descending elevator for some reason. As the elevator is moving at a constant velocity, the scale reads 85kg. As the elevator approaches his floor, it starts to decelerate at 4m/s2. What does the scale read now?
A 45 kg45\ kgman is standing in an elevator.
Draw a free body diagram of the system then find the normal force and the apparent weight of the man for the following cases.
a) The elevator is traveling steadily at 3[ms]3\left[\frac{m}{s}\right]
Forces: Normal force
A person is standing on a scale in an elevator. How does the reading of the scale changes when the elevator is stationary, moving with a constant speed up, and is accelerating downward?
Note! The same question can be asked by a mass hanging on a spring in an elevator.
Example: Weightlessness
Consider an accelerating elevator. (If the elevator is accelerating, is there a net force on the elevator?) A 50 kg person is standing on a scale in the elevator.
a) What would be the reading on the scale if it was not accelerating?
b) What would be the reading on the scale if the acceleration was 3.0 m/s2m/s^2upward?
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.
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
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
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.
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?