physics exam

42 terms by megansullivan

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location

moving

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the bottom

always true

always false

when a rifle is fired it recoils as the bullet is set in motion. The rifle and bullet ideally acquire equal

amounts of energy but opposite amounts of momentum

the total momentum of a flock of identical birds could be zero only if the birds are

flying in different directions

if you push for a half hour or a whole hour against a stationary wall

no work is done on either case

twice as much

decreases

two identicial arrows, one with twice the speed of the other, are fired into a hay bale. the faster arrow will penetrate

four times as far as the slower arrow

two identical arrows, one with twice the kinetic energy of the other, are fired into a hay bale. the faster arrow will penetrate

twice as far as the slower arrow.

a car that travels twice as fast as another when braking to a stop will skid

four times as far

if you do work on an object in one-third the usual time, your power output is

three times the usual power output.

which requires the most amount of work by the brakes of a car

slowing down from 100 km/h to 70 km/h

a car moves 4 times as fast as another identical car. compared to the slower car the faster car has

16 times the kinetic energy

unchanged

a 1000-kg car and a 200-kg car are hoisted the same distance. raising the more massive car requires

twice as much work

the 60 km/hr car

the same

of you push an object twice as far while applying the same force you do

twice as much work

80 j

10 N

10%

5000 J

1 W

2 m

50 w

a pully system raises a 1000-N load 2 meters with 100 N of input force. The efficiency of the system is

not enough information given

twice as much

12,500 J

250,000 N

40 J

40 J

2 W

180 m

whereas impulse involves the time that a force acts, work involves the

distance that a force acts

50%

40 kilowatts

scalar, vector

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