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Physics: Chapter 9
Test Description: Part 2
Instructions: Answer all questions to get your test result.
1) You lift a book 1 meter off your table. How would the amount of work you do change if you lift the book 3 meters off the table instead?
A
work is cut in 1/2
B
work is doubled
C
work is tripled
D
work is cut in 1/3
2) Work and energy are measured in
A
newtons
B
watts
C
joules
D
kilograms
3) If you push against an object and it doesn’t move, no work is being done on that object.
A
False
B
True
4) Which requires more work: lifting a 70-kg sack vertically 2 meters or lifting a 35-kg sack vertically 4 meters? kg sack vertically 4 meters? Which requires more work: lifting a 70-kg sack vertically 2 meters or lifting a 35
A
Both require the same amount of work.
B
Lifting the 70 kg sack
C
Lifting the 35 kg sack
5) It takes 80 J to push a large box 8 m across a floor. Assuming the push is in the same direction as the move, what is the magnitude of the force on the box?
A
640 N
B
10 N
C
8 N
D
80 N
6) The ability to do work.
A
efficiency
B
mechanical advantage
C
power
D
energy
7) Power is measured in
A
kilograms
B
joules
C
newtons
D
watts
8) Stored energy.
A
potential energy
B
kinetic energy
9) Suppose a moving car has 3000 J of kinetic energy. If the car's speed doubles,how much kinetic energy will it then have?
A
1500 J
B
6000 J
C
12000 J
D
3000 J
10) Power and time are _________________ related.
A
directly
B
not
C
indirectly
*select an answer for all questions
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