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Work Power And Energy
Test Description: Simple test on the concepts of Work, Power, and Energy
Instructions: Answer all questions to get your test result.
1) A force is applied to a spring causing it to stretch. If the applied force is DOUBLED, then the potential energy stored in the spring will be
A
quadrupled
B
quartered
C
halved
D
doubled
2) Energy is measured in the same units as
A
momentum
B
power
C
force
D
work
3) When a 5 kilogram block is lifted from the ground to a height of 10 meters, the gravitational potential energy of the block
A
increases by 500 J
B
decreases by 2 J
C
remains unchanged
D
increases by 50 J
4) A student does 300 Joules of work pushing a box of books 3 meters due north, then does 400 Joules of work pushing the box of book 4 meters west. She does
A
500 Joules of total work
B
2500 Joules of total work
C
100 Joules of total work
D
700 Joules of total work
5) According to classical Physics, in which of the following cases is work being done?
A
A spring force holds a screen door shut against the pull of the wind.
B
A gravitational force holds a llama on the surface of the Earth.
C
A tension force pulls a wagon up a shallow incline against friction.
D
A normal force acts vertically on a box that is only free to move horizontally.
6) A crane raises a 200 Newton weight to a height of 50 meters in 5 seconds. The crane does work at the rate of
A
2000 Watts
B
50000 Joules
C
20 Watts
D
0.80 Joules
7) The speed of a certain car driven at 80 kph has a kinetic energy of 80,000 Joules. If the speed is reduced to 40 kph, then the kinetic energy will
A
decrease to 20,000 Joules
B
increase to 160,000 Joules
C
remain the same
D
decrease to 40,000 Joules
8) At what point during the fall of an object from a table will its kinetic energy equal its potential energy?
A
Only at the very end of the fall
B
Only at the very start of the fall
C
Halfway to the ground
D
At all points before it hits the ground
9) A 1.0 kilogram pendulum bob is moving 10 meters per second at the very bottom of its swing. If the pendulum rope is 10 meters long, then the bob will rise
A
9.8 meters at the top of the arc
B
2.6 meters at the top of the arc
C
5.1 meters at the top of the arc
D
7.5 meters at the top of the arc
10) The amount of work done against friction to slide a box in a straight line on a level surface depends most on
A
the time taken to move the box
B
the speed that the box is moved
C
the direction the box is moved
D
the distance the box is moved
*select an answer for all questions
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