physics test work
If Skelly the skater's speed is increased so he has twice the momentum, then his kinetic energy is increased by...
four
A car that travels twice as fast as another when braking to a stop with the same force and mass, will skid...
four times as far
If you push an object with twice the force for twice the distance, you do...?
four times the work
At position A, is the marble's kinetic energy less than, greater than, or the same as its kinetic energy when its at B?
greater
A bow is drawn so that it has 40 J of potential energy. When fired, the arrow will ideally have a kinetic energy of...
less than 40 J
An object that has potential energy may have this energy because of its...
location
An object that has kinetic energy must be...
moving
If you lift one load up two stories, how much work do you do compared to lifting one load up only one story?
twice as much
Exert 1 N for a distance of 1 m in 1 s and you deliver a power of...
1 W
True or False: The energy an object has by the virtue of its motion is called kinetic energy
True
True or False: The energy an object has by virtue of location is called potential energy
True
True or False: The rate at which work is done is called power
True
Which requires more work; lifting a 50 kg sack vertically 2 meters or lifting a 25 kg sack vertically 4 meters?
both require the same amount of work
When a car is braked to a stop, its kinetic energy is transformed to...
potential energy
a job is done slowly while an identical job is done quickly. Both jobs require the same amount of work, but different amounts of...
power
When an object is lifted 10 meters, it gains a certain amount of potential energy. If the same object is lifted 20 meters, its potential energy gain is...
twice as much
If you push an object just as far while applying twice the force you do...
twice as much work
If you push an object twice as far while applying the same force you do...
twice as much work
if you do work on an object in half the usual time, your power output is...
twice the usual power output
If you double the velocty...
you quadruple the kinetic energy
True or False: More power is needed to carry a heavy suitcase slowly up a flight of stairs than to carry the suitcase quickly up the same flight of stairs
False
A 2 kg mass has 40 J of potential energy with respect to the ground. Approximately how far is it located above the ground?
2 m
A car moves 4 times as fast as another identical car. Compared to the slower car, the faster car has...
4 times the KE
How much work is done on a 50-N rock that you lift 10 m straight up?
500 J
How much power is expended if you lift a 50-N rock 10 meters in 1 second?
500 W
