AP Physics 1 Unit 4 Review

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

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Kinetic Energy is defined as

• Energy stored due to its location

• Energy of motion

• Energy stored in the bonds of molecules

• Heat energy

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What is the definition of Mechanical Energy?

• a change in speeed 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

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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.

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

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NGSS.HS-PS2-1

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.

True or False

The total energy in an isolated system can be increased.

• true

• false

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

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NGSS.HS-PS2-1

True or False

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

• True

• False