# Shared Flashcard Set

Chapter 7
test.
25
Physics
11/25/2012

## Additional Physics Flashcards

Term
 if you push for a half hour or a whole hour against a stationary wall..
Definition
 no work on the wall is done in either case.
Term
 if you push an object twice as far while applying the same force, you do..
Definition
 twice as much work
Term
 if you find the twice as much work is needed to perform a task but it takes twice as much time, the amount of power required is...
Definition
 unchanged.
Term
 a job is done slowly, while an identical job is done quickly, both jobs require the same amount of work, bt different amounts of...
Definition
 power
Term
 if you do work on an object in one-third the usual time, your power output is...
Definition
 three times the usual power output
Term
 do 100J of work in 50s and your power output is...
Definition
 2W
Term
 if an object is raised twice as high, its potential energy will be...
Definition
 twice as much
Term
 a 1000-kg car and a 2000-kg car are hoisted the same distance. raising the more massive car requires...
Definition
 as much work.
Term
 an object that has kinetic energy must be
Definition
 at rest.
Term
 an object may have potential energy because of its...
Definition
 location
Term
 a clerk can lift containers a vertical distance of 1 meter or can roll them up 2 meter long ramp to the same elevation. with the ramp, the applied force required is about....
Definition
 half as much
Term
 when an automobile is braked to a stop, its kinetic energy is transformed to..
Definition
 heat
Term
 a ball rolling down an incline has its maximum potential energy at...
Definition
 the bottom
Term
 a ball rolling down an incline has its maximum kinetic energy at...
Definition
 the bottom
Term
 what task requires the most work, lifting a 50 kg sack 2 meters or lifting a 24 kg 4 meters?
Definition
 both require the sam amount of work.
Term
 a TV set is pushed a distance of 2 m with a force of 20 N. how much work is done on the set?
Definition
 40 J
Term
 it takes 40 J to push a large box 4 m across a floor. assuming the push is in the same direction as hte move, what is the magnitude of the force on the box?
Definition
 10 N
Term
 a 2kg mass is held 4 meters above the ground. what is the approximate potential energy of the mass with respect to the ground?
Definition
 80J
Term
 two identical arrows, one with twice the kinetic energy aof the other, are fired into a hay bale, the faster arrow will penetrate....
Definition
 twice as far as the slower arrow.
Term
 a car moves 4 times as fast as another identical car,. compared to the slower car, the faster car has...
Definition
 16 times the KE
Term
 strictly speaking, more fuel is consumed by your car if an air conditionar, headlights, or even a radio is turned on. the statement is...
Definition
 true
Term
 a machine puts out 100 watts of power for every 1000 watts put into it. the efficiency of the machine is....
Definition
 10%
Term
 a car moving at 50 km/hr skids 20 m with locked breaks. how far will the car skid with locked breaks if it were traveling at 150 km/hr?
Definition
 180 m
Term
 which has greater kinetic energy, a car traveling at 30 km/hr or a car of hlf the mass traveling at 60 km/hr?
Definition
 the 60 km/hr car
Term
 a driver who weighs 500 N steps off a dving board that is 10 m above the water. the diver hits the water with kinetic energy of...
Definition
 5000 J
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