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