AP Physics 1 : Work, Energy, and Power
Study concepts, example questions & explanations for AP Physics 1
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Example Questions
Example Question #41 : Kinetic Energy
Moment of inertia of a ring:
A bicycle wheel has a mass of 
None of these
Combining equations
Plugging in values:
Example Question #91 : Work, Energy, And Power
A spaceship of mass 
Determine the kinetic energy of the ship after 
None of these
Plugging in values
Using
Using
Example Question #41 : Kinetic Energy
Moment of inertia of a ring:
A bicycle wheel has a mass of 
None of these
Combining equations
Plugging in values:
Example Question #44 : Kinetic Energy
An object of mass 
Kinetic energy is equal to 
Example Question #91 : Work, Energy, And Power
If the velocity of an objects is halved, what is the resulting change in the kinetic energy?
Quartered
Squared
Quadrupled
Doubles
No change.
Quartered
The equation for kinetic energy is:
Thus, the kinetic energy is quartered.
Example Question #46 : Kinetic Energy
What is the kinetic energy of an object of mass 
To answer this question, we'll need to use the formula for kinetic energy.
Plugging in the values given to us, we can solve for our answer.
Example Question #92 : Work, Energy, And Power
An object has a mass, M, and a velocity, V.
What happens to the object's kinetic energy if its mass is doubled?
The object's kinetic energy is quadrupled.
The object's kinetic energy is halved.
The object's kinetic energy goes to zero.
The object's kinetic energy remains the same.
The object's kinetic energy is doubled.
The object's kinetic energy is doubled.
The equation for kinetic energy is:
Where 
We can see that the relationship between kinetic energy and mass is linear, so when the velocity is doubled, the kinetic energy is also doubled.
Example Question #93 : Work, Energy, And Power
An object has a mass, M, and a velocity, V.
What happens to the object's kinetic energy if its velocity is doubled?
The object's momentum is one fourth of its original momentum.
The object's momentum is halved.
The object's momentum is doubled.
The object's momentum remains the same.
The object's momentum is quadrupled.
The object's momentum is quadrupled.
The equation for kinetic energy is:
Where
We can see that the relationship between kinetic energy and velocity is quadratic, so when the velocity is doubled, the kinetic energy is quadrupled.
Example Question #94 : Work, Energy, And Power
A ball with a mass of 3 kilograms is uniformly accelerated from rest and travels 110 meters in 6 seconds. What is its final kinetic energy in Joules after 6 seconds?
2017 Joules
2012 Joules
2300 Joules
1500 Joules
1888 Joules
2017 Joules
Find the final velocity by multiplying the average velocity by 2. Then substitute into the equation for kinetic energy.
Example Question #1 : Gravitational Potential Energy
A lazy contractor of mass 80kg who is bricking a building figured out that a seesaw makes his life much easier. He needs to deliver bricks to his coworker who is 10 meters above him. The contractor puts bricks on one side of the seesaw and jumps on the other side to fling the bricks upward. If the contractor jumps onto the seesaw from a height of 1.5 meters, what is the maximum mass of bricks he can put on the seesaw that will reach his coworker?
This problem can either be very simple or very complex.
You could convert the contractor's potential energy into kinetic energy, and then find the velocity at which he hits the seesaw. Then, use that to calculate the kinetic energy of the bricks and the height at which the bricks will fly. Although some may find that fun to do, it's unnecessary.
If we assume that all of the energy of the man is transferred to the bricks, we can use the conservation of energy equation:
We need to make a few clarifying statements for our initial and final states. In the initial state, the contractor is at a height of 1.5m and not moving. The bricks are not moving at this point either. In the final state, the man is on the ground not moving, and the bricks are at a height of 10m and not moving. Therefore, we can rewrite the above equation as the following:
Rearranging for the mass of the bricks:
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