Font size
WorksheetsAP Physics 1: Work and Kinetic Energy
Total questions: 45
Worksheet time: 11hrs 15mins
A dude drags a car mass M across a rough floor with a force of magnitude directed at an angle theta of above the horizontal as shown. If he drags the crate for a distance D, which of the following is equal to the work by the force of friction?
−FcosθD
−μmgD
−μ(mg−Fsinθ)D
−μ(mg+Fcosθ)D
A car of mass m is traveling at a speed of when the driver applies the brakes. The car moves a distance of d before it stops completely. What is the magnitude of the braking force required?
v22d
2dmv2
d2v2
dmv
A beat is dropped from the edge of a cliff. Which of the following graphs best represents the beat's kinetic energy KE as a function of time t?
By what factor will the kinetic energy of an object increase if the velocity of the object is tripled?
The kinetic energy will stay the same.
3
6
9
A kg-m2/s2 is otherwise known as a(n)
Newton
Joule
Watt
Displacement
A rocket of mass m begins to ascend vertically at v m/s. The work that gravity does on the rocket is:
Negative
Zero
Positive
Undefined
How much work is done?
9 J
18 J
27 J
36 J
The graph shows the Force related to displacement of a lady pushing her daughter in a stroller. How much work was done by moving the buggy from 0-2m?
80J
-100J
20J
40J
The graph shows the Force related to displacement of a lady pushing her daughter in a stroller. How much work was done by moving the buggy from 2m to 7m?
80J
-100J
20J
40J
The graph shows the Force related to displacement of a lady pushing her daughter in a stroller. What is the TOTAL work done from 0-7m?
80J
-100J
-20J
20J
Find the work done by moving the box from 10m position to 30m position
-200J
200J
2J
20J
Find the work done by moving the box from 0m position to 20m position
-200J
200J
150J
50J
Find the work done by moving the box from 10m position to 40m position
250J
200J
150J
50J
A student creates a ramp by stacking four blocks and then leaning a meter stick against it. She releases four different balls from the same position on the ramp and calculates their speeds. Based on the information in the table below, which ball would you predict to have the LEAST kinetic energy when it reaches the end of the ramp?
Golf
Tennis
Baseball
Softball
A graph showing the kinetic energy of a 10 kg object at different speeds is provided. Based on the information in the graph, we can predict that the kinetic energy of the object at 2 m/s would be ...
0 J
5 J
20 J
60 J
In order for an object moving at 10 m/s to have a kinetic energy of 750 Joules, the object must have a mass in the range of–
0-10 kg
10-20 kg
20-30 kg
30-40 kg
Kinetic energy depends on the ________ and ________ of the object.
Height (position)
Mass
Speed
Friction
What is the unit of measurement for energy?
Newton
Watt
Joule
Metres
Which of the following has the largest kinetic energy?
A person carries a mass of 10 kg and walks along the +x-axis for a distance of 100m with a constant velocity of 2 m/ s. What is the work done by this person?
OJ
20J
200J
None of the other choices is correct.
A 100 kg object is pulled vertically upwards by a constant force of 4000 N for a distance of 20.0 m. What is the work done by the applied force on the object?
60,400 kg m/ s2
80,000 kg m/s2
80,000 kg m2/s2
60,400 kg m2/s2
An object of 1.0 kg mass is pulled up an inclined plane by a constant force of 10 N that causes a displacement of 0.50 m. The angle of inclination with the horizontal is 30°. Neglect friction and use g=10 m/s2.
What is the work done by the net force on the object along the inclined plane?
4.3J
4.3 kg m/s2
0 J
2.5 J
An object of 1.0 kg mass is pulled up an inclined plane by a constant force of 10 N that causes a displacement of 0.50 m. The angle of inclination with the horizontal is 30°. Neglect friction and use g=10 m/s2.
What is the work done by the 10 N force on the object along the inclined plane?
4.3J
4.3 kg m/s2
5 J
2.5 J
How much work is done in lifting a 20 kg object through a distance of 0.40 m? Use g = 10 m/ s2
80 kgm/s
80kgm2/s
80kgm/s2
80 kg m2/s2
An object of mass 10.0 kg is initially at rest. A 100 N force causes it to move horizontally through a distance of 6.00 m. What is the change in the kinetic energy of this object?
0J
200 J
60.0 J
600 J
A boy throws a ball to another boy who throws it back with half the original speed. What is the ratio of the final kinetic energy to the initial kinetic energy of the ball?
0.25
0.50
2.00
0.75
The ratio of the kinetic energy of object A to the kinetic energy of the object B is 2:1. The mass of object A is 2 kg and the mass of object B is 4 kg. If the object A has a speed of 4 m/s, what is the speed of object B?
8.0m/s
6.0 m/s
1.4 m/s
2.0m/s
A 1.0-kg object moving in a certain direction has a kinetic energy of 2.0 J. It hits a wall and comes back with half its original speed. What is the kinetic energy of this object at this point?
2.0 J
1.0 J
0.50 J
4.0 J
An object is under the influence of a force as represented by the force vs. position graph in Figure 7-5. What is the work done as the object moves from 4 m to 6 m?
20 J
30 J
0 J
40 J
An object is under the influence of a force as represented by the force vs. position graph in Figure 7-5. What is the work done as the object moves from 0 m to 4 m?
20 J
30 J
0 J
40 J
Work is done ___________
only when force is applied
on an object
cause the object to move
into the opposite direction
as applied force.
only when force is applied
on an object
cause the object to move
into the same direction
as applied force.
Formula of work:
W = F x t
W = F + t
W = F / d
W = F x d
Work causes a change in
Sweat
Energy
Calories
Force
Which of the following is the best example of work being done?
You lift a heavy box off the floor
You stand still holding a heavy box
Work is being done in both lifting and holding a heavy box
No work is being done for either lifting nor holding a heavy box
Which equation would you use to find distance when you know mass, Vf, Vi, and Force?
W = KEf - KEi
F⋅d = KE
W = 1/2 mvf2 - 1/2 mvi2
F⋅d = 1/2 mvf2 - 1/2 mvi2
Why does kinetic friction always do negative work on a sliding object?
Kinetic friction always points in the direction opposite to an object's velocity, slowing it down and transferring energy from the object to the environment.
Kinetic friction always points in the same direction as an object's velocity, slowing it down and transferring energy from the object to the environment.
Kinetic friction always points in the direction opposite to an object's velocity, slowing it down and transferring energy from the environment to the object.
Kinetic friction always points in the same direction as an object's velocity, slowing it down and transferring energy from the environment to the object.
Which of the following is true about the work done on an object by gravity?
Gravity always does positive work on an object that moves downward.
Gravity always does negative work on an object that moves downward.
Gravity always does no work on an object that moves downward.
Gravity sometimes does positive work on an object that moves down.
An object is slowing down. What can be concluded?
The sum of work done by each force acting on the object is negative.
The angle between the net force on the object and object's displacement is acute.
No force is doing positive work on the object.
The angle between the net force on the object and the object's displacement is 180 degrees.
An object is released at rest on a frictionless inclined plane, after which it slides down the inclined plane. Which of the following is true while the object is sliding? (SELECT ALL THAT APPLY.)
Only gravity does work on the object.
The angle between the normal force on the object and the object's displacement is 90 degrees.
Both gravity and normal force do work on the object.
The angle between the object's weight and displacement is obtuse.
An object experiences two forces, F1 and F2, and moves with constant speed. What can be concluded?
W1 = -W2
W1 = W2 = 0
F1 = F2 (magnitudes)
ΣF = 0
Work is scalar.
