Physics final 9.1-9.7

Energy can never be created or distroyed. It can only be transformed from one form to another. True/false

True

Power is the rate at which work is done. True/false

True

The energy an object has by virtue of its location is its potential energy. True/false

True

The energy an object has by virtue of its motion is its kinetic energy. True/false

True

The rate at which work is done is called power. True/false

True

The unit of power is the watt. True/false

True

The unit of work is called the joule. True/false

True

Work is the product of the net force on an object and the distance through which the object is moved. True/false

True

An object at rest may have a. energy. b. speed. c. velocity. d. momentum. e. none of the above

a. Energy

The unit for kinetic energy is a. joules b. watts c. newtons d. kg m/s

a. joules

The unit of power is the a. watt. b. second. c. meter. d. joule. e. newton.

a. watt

Power is defined as the a. work done on an object divided by the time taken to do the work. b. distance divided by the time taken to move that distance. c. force on an object times the distance the object moves. d. force on an object divided by the time the force acts. e. work done times the time taken to do that work.

a. work done on an object divided by the time taken to do the work.

In physics, the amount of work done on an object is the product of the force exerted on the object times the time the object moves. True/false

False

The rate at which work is done is called energy. True/false

False

The speed of an object is important when calculating the object potential energy. True/false

False

If Nellie Newton pushes an object with twice the force for twice the distance, she does a. twice the work b. four times the work c. eight times the work d. the same work

b. four times the work

The unit for potential energy is a. newtons b. joules c. kg m/s d. watts

b. joules

Potential energy is the energy an object has because of its a. temperature. b. location. c. speed. d. density. e. size.

b. location

Energy is changed from one form to another with no net loss or gain. a. Sometimes true b. Always false c. Always true

c. Always true

The property of an object or system that enables it to do work is a. mass b. speed c. energy d. power

c. energy

Mechanical energy is the energy due to a. the position of something b. the movement of something c. the position of something or the movement of something

c. the position of something or the movement of something

The unit of work is the a. meter. b. watt. c. newton. d. joule. e. second.

d. joule

An object that has kinetic energy must be a. falling. b. at rest. c. elevated. d. moving.

d. moving

In Physics, work is defined as a. force times time b. distance divided by time c. force divided by time d. force divided by distance e. force times distance

e. force times distance

Kinetic energy of an object is equal to a. its mass multiplied by its acceleration squared. b. one half the product of its mass times its speed. c. its mass multiplied by its speed. d. its mass multiplied by its acceleration. e. one half the product of its mass times its speed squared.

e. one half the product of its mass times its speed squared.

The amount of potential energy possessed by an elevated object is equal to a. the force needed to lift it. b. the value of the acceleration due to gravity. c. the power used to lift it. d. the distance it is lifted. e. the work done in lifting it.

e. the work done in lifting it.