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Work And Simple Machines
Test Description: Work and Power; Mechanical Advantage; inclined planes
Instructions: Answer all questions to get your test result.
1) The work done by a boy pulling a snow sled up a hill is 425 Joules. What is the power expended by the boy if the he pulls on the sled for 10.5 seconds?
A
40.5 W
B
4,460 W
C
24.7 W
D
247 W
2) What is the force between all bonds and contact added together?
A
Friction
B
Efficiency
C
Gravity
D
Electricity
3) Ture or False? Efficiency equals the output work, divided by the input work times 100%.
A
True
B
False
4) What does a second class level consist of?
A
Axle
B
Fulcrum
C
Wheel
5) Which of the following is a requirement for work to be done?
A
Force is exerted.
B
Object is carried.
C
Machine is used.
D
Force moves an object
6) What is work?
A
Work is done when force exerted on an object causes it to move.
B
Work is force exerted on a machine.
7) What is a fixed pulley?
A
A fixed pulley uses several pulleys to increase the mechanical advantage.
B
A fixed pully changes the direction of the output force.
C
A fixed pulley changes the direction of the input force.
8) What is the equation for power?
A
Time divided by work.
B
Work divided by time.
C
Time times work.
9) Which is not an inclined plane?
A
Inclined plane
B
Screw
C
Lever
D
Wedge
10) A ___________ is an inclined plane around a cylinder or post.
A
Screw
B
Lever
C
Wedge
D
Wheel and axle
*select an answer for all questions
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