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Work And Power
Test Description: Definition of work and power, including problems.
Instructions: Answer all questions to get your test result.
1) Work occurs when
A
something moves in the direction of the force
B
something moves against the direction of the force
C
something stays still
D
something moves
2) Which of the following does NOT demonstrates work?
A
Lifting your books off a desk
B
Carrying a backpack to class
C
Pulling a suitcase through the airport
D
Pushing a cart through a store
3) What is the formula used to calculate work?
A
joules multiplied by watts
B
force added to force
C
distance divided by time
D
force multiplied by distance
4) The newton-meter is the unit used to describe force. What is its synonym?
A
watt
B
newton
C
power
D
joule
5) Cmdr. Data used 2 N of force to lift his cat, Spot, 1.5 meters from the floor to his sofa. How much work did he do?
A
No joules because no work was actually being completed.
B
3 joules
C
30 joules
D
.75 joules
6) The rate at which work is done is known as
A
newton-meters
B
time
C
power
D
joules
7) The formula for power is
A
work divided by time
B
time divided by work
C
force multiplied by distance
D
joules multiplied by time
8) Power is measured by joules per second. What is a synonym for this measurement?
A
meter/second
B
watt
C
joule
D
ampere
9) How much power is used if it takes Lt. Cmdr. Worf 10 seconds to complete 35 joules of work?
A
3.5 watts
B
350 watts
C
45 watts
D
25 watts
10) Kirk and Spock race to move identical boxes the same distance. Spock finishes first. How can this happen?
A
Kirk used less time than Spock.
B
Spock used more power than Kirk.
C
Spock is a Vulcan, and he tricked Kirk.
D
Kirk has more power than Spock.
*select an answer for all questions
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