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Kinematics: Braking Distance
Related Topics
Wize University Physics Textbook (Master) > Motion in 1/2/3D: Kinematics
One-Dimensional Kinematic Equations
3 Activities
A car can decelerate at 4.0
m
/
s
2
m/s^2
m
/
s
2
. If somebody is driving this car at 110 km/h and human reaction time is 0.45 seconds, what will the stopping distance be for the driver?
130 m
117 m
120 m
125 m
I don't know
Check Submission
More One-Dimensional Kinematic Equations Questions:
Dave drives a truck at a constant 20 m/s and passes me on my stationary motorbike, at which point I lay on the gas and accelerate at 8.0 m/s
2
. How far has my motorbike driven when I pass Dave?
Practice: Drone flight
A drone was controlled as follows:
I. At
t
=
0
s
t=0\ s
t
=
0
s
, the drone was stationary on the surface of the ground (
y
=
0
y=0
y
=
0
)
II. At
t
=
5
s
t=5\ s
t
=
5
s
, it was raised up at a constant speed of
4
m
/
s
4\ m/s
4
m
/
s
Motion in 1D and Acceleration
A car is travelling at 20 m/s and the driver applied the brake for 10 seconds before the car comes to a stop.
Kinematics
Your dog, Buttercup, sees your neighbour's cat (Waffles) running at its maximum speed of
4
m
/
s
4\ m/s
4
m
/
s
. If your dog can go from 0 to 60 km/h in a time of 15 seconds, will Buttercup catch Waffles before the
35
m
35m
35
m
driveway ends? Show your work.
Kinematics
A bike speeds up from
10.0
k
m
/
h
r
10.0 km/hr
10.0
k
m
/
h
r
to
32.0
k
m
/
h
r
32.0 km/hr
32.0
k
m
/
h
r
in
15.0
s
15.0 s
15.0
s
. The acceleration is constant.
a) What is the acceleration of the bike? Enter your answer in m/s
2
.
b) How much distance was traveled in that time? Enter your answer in meters.
Using the equations and problem-solving steps: Police chase
Let's illustrate the use of kinematic equations and problem-solving steps with an example.
A vehicle travelling 130 km/h passes a police car at rest. As soon as the vehicle passes the police car, the police car turns its lights on and begins to accelerate to its maximum speed of 140 km/h.
A drone was controlled as follows:
I. At
t
=
0
s
t=0\ s
t
=
0
s
, the drone was stationary on the surface of the ground (
y
=
0
y=0
y
=
0
)
II. At
t
=
5
s
t=5\ s
t
=
5
s
, it was raised up at a constant speed of
4
m
/
s
4\ m/s
4
m
/
s
A car is travelling at 20 m/s and the driver applied the brake for 10 seconds before the car comes to a stop.
A block is sliding on gym floor. The coefficient of static and kinetic friction between the block and the floor are
0.4
0.4
0.4
and
0.07
0.07
0.07
respectively. If the block is initially traveling at
3
m
/
s
3\ m/s
3
m
/
s
find the total distance the block must travel to stop. Draw and label a FBD for both the initial state and the final state.
If a bullet leaves the muzzle of a rifle at 600.0 m/s, and the barrel is 0.90 m long, what was the acceleration of the bullet while in the barrel?
Enter your answer in scientific notation in the following form: 1.0x10^2. Don't include units in your answer (units are in m/s
2
)
Practice question: kinematic equations
A bullet is fired through a board 10.0 cm thick in such a way that the bullet’s line of motion is perpendicular to face of the board. If the initial speed of the bullet is 400 m/s and it emerges from the other side of the board with a speed of 300 m/s, find (a) the acceleration of the bullet as it passes through the board and (b) the total time the bullet is in contact with the board.
A ball is thrown with an initial upwards velocity of
v
0
v_0
v
0
from a height
h
h
h
(both of these values are positive).
a) What is the maximum velocity during the motion?
b) What is the point of minimum acceleration?
Practice: Acceleration
A drone was controlled as follows:
I. At
t
=
0
s
t=0\ s
t
=
0
s
, the drone was stationary on the surface of the ground (
y
=
0
y=0
y
=
0
)
II. At
t
=
5
s
t=5\ s
t
=
5
s
, it started to raise up at a constant speed of
4
m
/
s
4\ m/s
4
m
/
s
Your dog Buttercup sees your neighbour's cat (Mr. Waffles) running past at its top speed of
4
m
/
s
4\ m/s
4
m
/
s
. If your dog has an impressive
0
−
60
k
m
/
h
0-60\ km/h
0
−
60
k
m
/
h
of
15
s
15 s
15
s
will Buttercup catch Mr. Waffles before the
35
m
35m
35
m
driveway ends?
Two runners (Bob and Alice) are racing. Alice is much faster than Bob and is placed such that she starts
25
m
25\ m
25
m
behind Bob. She is
1.5
1.5
1.5
times faster than Bob who runs at
8
m
/
s
8\ m/s
8
m
/
s
.
a) If they both start at the same time, when are these runners at the same point on the track?
b) Who will win in a
1000
m
1000\ m
1000
m
race if Alice has to start
200
m
200\ m
200
m
behind?
A bike accelerates constantly from
10
k
m
/
h
r
10km/hr
10
k
m
/
h
r
to
32
k
m
/
h
r
32km/hr
32
k
m
/
h
r
in
15
s
15 s
15
s
. What is the acceleration of the bike? How much distance was traveled in that time?
Dave drives a truck at a constant 20 m/s and passes me on my stationary motorbike, at which point I lay on the gas and accelerate at 8.0 m/s
2
. How far has my motorbike driven when I pass Dave?
I over-packed a box and it weighs 50kg. I'm pulling it across a rough surface at an angle of 45 degrees above the horizontal with a force of 280N. The coefficient of kinetic friction of the floor is 0.5. I pull for 10 seconds, the box speeds up from rest, I release it and it continues to slide to a halt. What is its maximum speed? How long until it stops? What is the box's total displacement?
Kinematic equations
If a bullet leaves the muzzle of a rifle at 600.0 m/s, and the barrel is 0.90 m long, what was the acceleration of the bullet while in the barrel?
Enter answer in m/s
2
Practice question: kinematic equations
A bullet is fired through a board 10.0 cm thick in such a way that the bullet’s line of motion is perpendicular to face of the board. If the initial speed of the bullet is 400 m/s and it emerges from the other side of the board with a speed of 300 m/s, find:
(a) the acceleration (in km/s
2
) of the bullet as it passes through the board and
(b) the total time (in sec) the bullet is in contact with the board.
A speeding car is traveling at a constant 50 m/s when it passes a stationary police car. If the police car delays 2s before starting, what must be the magnitude of the constant acceleration of the police car to catch the speeding car after the police car travels a distance of 500 m?
A car is travelling at 20m/s and the driver applied the brake for 10 seconds before the car comes to a stop. What is the net acceleration (deceleration) of the car?