Free Printable AP Physics 1 - Energy Review (Unit 4)

Worksheets

AP Physics 1 - Energy Review (Unit 4)

Total questions: 22

Worksheet time: 23mins

Name

Class

Date

Gravitational potential energy is defined as

the energy an object has due to its height above the ground

the energy an object has due to its motion

the energy a spring has due to its stretch

the chemical energy stored in the molecules of atoms

Kinetic Energy is defined as

Energy stored due to its location

Energy of motion

Energy stored in the bonds of molecules

Heat energy

What is the definition of Mechanical Energy?

a change in speed or direction

the ability to do work

a force that works against motion as surfaces rub together

the energy an object has because of its motion

True or False

Negative work means that energy is being removed from the object.

True

False

The sum of the kinetic and potential energy in a system is known as the system's total _____________________ energy.

mechanical

chemical

thermal

combined

Work involves a force acting upon a __________ object, either with its motion or against its motion.

moving

stationary

heavy

light

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?

Jared holds a book still two feet above his desk. He then lowers the book at a constant speed and places it on the desk. Which of the following describes the change in total mechanical-energy of the book?

The total mechanical energy is unchanged since there is no net work done as the book is lowered.

The total mechanical energy decreases because Jared does positive work on the book.

The total mechanical energy is unchanged because no work is done on the book while it is lowered.

The total mechanical energy decreases, because Jared does negative work on the book.

The system shown consists of two objects of unequal masses, M₁ and M₂, and pulley with negligible mass and friction. Which of the following is true about the changes in the gravitational potential energy and kinetic energy of the system soon after the objects are released from rest?

$\Delta U\ =\ 0\ and\ \Delta K>0$

$\Delta U>0\ and\ \Delta K>0$

$\Delta U<0\ and\ \Delta K>0$

$\Delta U=0\ and\ \Delta K=0$

10.

True or False

The total energy in an isolated system can be increased.

True

False

11.

What is the difference between calculating power and work?

Power takes into account the time it takes to complete a task

Work takes into account the time it takes to complete a task

Power is force/area

Work is force/area

12.

True or False

Gravity does negative work on you when you walk up some stairs.

True

False

13.

How are work and energy related?

The work done by an external force acting on an object causes a change in the mechanical energy of the object.

Work is the same thing as energy. They are equal.

Energy is m*g*h, and work is 1/2*m*v²

14.

A block of mass M on an inclined surface is attached to a spring of negligible mass, as shown. The other end of the spring is attached to a wall, and there is negligible friction between the block and the incline. The block is pulled to a position such that the spring is stretched from its equilibrium position. The block is then released from rest. Which of the following systems can be classified as a closed system?

A system consisting of the block only

A system consisting of the spring and Earth

A system consisting of the block and spring

A system consisting of the block, spring, and Earth

15.

A pendulum is released from point C. Which statement is correct as it swings from C to A?

The $U_g$ increases and $K$ decreases

The $K$ increases and $U_g$ decreases.

The $U_g$ is maximum at A.

The $K$ is maximum at C and B.

16.

An object is projected vertically upward from ground level. It rises to a maximum height H. If air resistance is negligible, which of the following must be true for the object when it is at a height H/2?

Its speed is half of its initial speed.

Its kinetic energy is half of its initial kinetic energy.

Its potential energy is half of its initial potential energy.

Its total mechanical energy is half of its initial value.

17.

A spring is compressed by a force F against a wall as shown. Which of the following describes the sign of work done by the spring as it is being compressed?

The spring does positive work since it is gaining potential energy.

The spring does zero work since all the work is done by force F.

The spring does negative work since it applies a force against the direction of its compressing motion.

The spring works part-time at Chik Fil-A.

18.

In which of the following situations is kinetic energy decreasing?

A lit tinsel llama is dropped from a building.

A satellite is moving in a circular orbit around the moon.

A baseball is headed upward after being thrown up in the air.

An elevator is moving upward at a constant velocity.

19.

A roller coaster car of mass m has a speed of 0 m/s just before it starts to go down a hill as show above. Assume the roller coaster does not encounter any friction or air resistance. What is the speed of the roller coast car at point B?

$\sqrt{gh}$

$\sqrt{2gh}$

$\sqrt{\frac{gh}{2}}$

$\sqrt{\frac{2gh}{m}}$

20.

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?

$-F\cos\theta D$

$-\mu mgD$

$-\mu\left(mg-F\sin\theta\right)D$

$-\mu\left(mg+F\cos\theta\right)D$

21.

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?

$\frac{2d}{v^2}$

$\frac{mv^2}{2d}$

$\frac{2v^2}{d}$

$\frac{mv}{d}$

22.

A penguin of mass M is lifted upwards a vertical distance of H at a constant speed of v. Which of the following gives a correct expression for the power developed by the penguin as it is raised upward at constant speed?

$Mgv$

$\frac{mg}{v}$

$\frac{mgh}{v}$

$mgh$

100 %

AP Physics 1 - Energy Review (Unit 4)

Total questions: 22

Worksheet time: 23mins

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