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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
B
something stays still
C
something moves in the direction of the force
D
something moves against the direction of the force
2) Which of the following does NOT demonstrates work?
A
Lifting your books off a desk
B
Pulling a suitcase through the airport
C
Pushing a cart through a store
D
Carrying a backpack to class
3) What is the formula used to calculate work?
A
force multiplied by distance
B
joules multiplied by watts
C
distance divided by time
D
force added to force
4) The newton-meter is the unit used to describe force. What is its synonym?
A
joule
B
power
C
newton
D
watt
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
3 joules
B
No joules because no work was actually being completed.
C
30 joules
D
.75 joules
6) The rate at which work is done is known as
A
power
B
joules
C
time
D
newton-meters
7) The formula for power is
A
time divided by work
B
force multiplied by distance
C
work divided by time
D
joules multiplied by time
8) Power is measured by joules per second. What is a synonym for this measurement?
A
watt
B
ampere
C
meter/second
D
joule
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
45 watts
C
25 watts
D
350 watts
10) Kirk and Spock race to move identical boxes the same distance. Spock finishes first. How can this happen?
A
Kirk has more power than Spock.
B
Spock used more power than Kirk.
C
Spock is a Vulcan, and he tricked Kirk.
D
Kirk used less time than Spock.
*select an answer for all questions
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