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Unit 6 Physical Science Review
Test Description: Work and machines
Instructions: Answer all questions to get your test result.
1) Which of the following is the best definition of work?
A
Work occurs when a force acts to hold an object in place
B
Work occurs when energy acts on an object
C
Works occurs when a force acts on an object
D
Work occurs when a force acts on an object and it causes displacement of that object
2) Work is a product of:
A
Force and Energy
B
Force and Distance
C
Force and Mass
D
Distance and Mass
3) What is the correct equation for calculating work?
A
Work=Force x Mass
B
Work=Force/Distance
C
Work=Force/Mass
D
Work=Force x Distance
4) What is the goal of a simple machine?
A
Simple machines keep the work the same but make work more difficult
B
Simple machines keep the work the same but make the work easier
C
Simple machines reduce the amount of work
D
Simple machines increase the amount of work
5) Which of the following is an inclined plane wraped around a rod?
A
Screw
B
Pulley
C
Wedge
D
Lever
6) Mechanical advantage describes how simple machines . . . .
A
Multiply the input Force
B
Increase the amount of work that is done
C
Reduce the input Force
D
Decrease the amount of work that is done
7) Which of the following is a simple machine?
A
A lightbulb
B
A screwdriver
C
A Car
D
A doorbell
8) What is Power?
A
Power is the rate at which work is done
B
Power is mass over distance
C
Power is the amount of work that is done.
D
Power is the amount of force over a distance
9) A watt is a unit of . . .
A
Heat
B
Power
C
Time
D
Light
10) When you cut a board with a power saw as compared with a handsaw, how much work do you do with the power saw?
A
Same amount of work in less time
B
More work in less time
C
Less work in more time
D
Less work in less time
11) What is power the quotient of?
A
Work and Distance
B
Work and Time
C
Force and mass
D
Speed and energy
12) How are moving pulleys different from fixed-position pulleys?
A
Moving pulleys are easier to use than fixed-position pulleys.
B
Moving pulleys have more force than fixed-position pulleys.
C
Moving pulleys are attached to the object and move with the object. Fixed-position pulleys are connected to a fixed point and
D
Moving pulleys are attached to the object and are stationary. Fixed-position pulleys are connected to a fixed point and move
*select an answer for all questions
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