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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
24.7 W
B
247 W
C
40.5 W
D
4,460 W
2) What is the force between all bonds and contact added together?
A
Efficiency
B
Gravity
C
Electricity
D
Friction
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
Wheel
C
Fulcrum
5) Which of the following is a requirement for work to be done?
A
Force moves an object
B
Machine is used.
C
Object is carried.
D
Force is exerted.
6) What is work?
A
Work is force exerted on a machine.
B
Work is done when force exerted on an object causes it to move.
7) What is a fixed pulley?
A
A fixed pulley uses several pulleys to increase the mechanical advantage.
B
A fixed pulley changes the direction of the input force.
C
A fixed pully changes the direction of the output force.
8) What is the equation for power?
A
Time times work.
B
Work divided by time.
C
Time divided by work.
9) Which is not an inclined plane?
A
Screw
B
Inclined plane
C
Lever
D
Wedge
10) A ___________ is an inclined plane around a cylinder or post.
A
Wheel and axle
B
Lever
C
Wedge
D
Screw
*select an answer for all questions
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