ch 8 : energy

an arrow in a bow has 70 J of potential energy. assuming no loss of energy to heat how much kinetic energy will it have after it has been shot A. 0 J B. 50 J C. 70 J D. 35 J

70 J

as a pendulum swings back and forth A. at the end points of its swing, its energy is all potential B. at the lowest part of its swing its energy is all kinetic C. kinetic energy is transform into potential D. potential energy is transform into kinetic energy E. all of the above

all of the above

energy is changed to from one form to another with no net loss or gain A. sometime true B. always false C. always true

always true

mechanical energy can be in a form of A. potential energy B. kinetic energy C. neither D. both

both

a job is done slowly, and an identical job is done quickly. Both jobs require the same amount of work but different amounts of A. energy B. power C. both a and b D. none of the above

both a and b

an object at rest may have A. velocity B. speed C. momentum D. energy

energy

in physics work is defined as A. force divided by time B. force divided by distance C. force times distance D. force times time

force times distance

if Nellie newton pushes an object with twice the force the distance she does A. twice the work B. four time the work C. the same work D. eight times the work

four time the work

potential energy is the energy an object has because of its A. temperature B density C. location D. size

location

an object that has kinetic energy must have A. a force applied to maintain it. B. momentum C. acceleration D. none of the above

momentum

if an object has kinetic energy then it also must have A. impulse B. force C. momentum D. acceleration E. none of the above

momentum

an object that has kinetic energy must be A. moving B. at rest C. falling D. elevated

moving

the unit of work is the A. joule B. watt C. second D. meter

second

the amount of potential energy energy possessed by an elevated object is equal to A. the distance it is lifted B. the force needed to lift it C. the work done in lifting it D. the power used to lift it

the work done in lifting it

if you have lift two loads up one story, how much work do you do compared to lifting just one load up one story A. four time as much B. twice as much C. the same amount D. one have as much

twice as much

if you lift one load up two stories how much work you do compared to lifting one load up one story A. twice the work B. one half as much C. four times as much D. one quarter as much

twice the work

the unit of power is the A. watt B. joule C. meter D. second

watt

power is defined as the A. work done on an object divided by the time taken to do work B. force on an object divided by four time the force acts C. work done times the time taken to do work D. distance divided by the time taken to move that distance

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