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Non-linear Power Point
7th Grade Super ReviewBy: Ms. Stipa
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Work and Simple Machines Review
This is a short review to test your mind. Do you know what it means to do work? Can you identify simple machines and their uses?
For each question, select the best answer. Follow the onscreen directions and navigation buttons to make your way through the questions.
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Question 1A). Spending all day to writing a report.
B)Leaning against the wall.
C)Holding two books for ten seconds.
D) Raising and lowering a light object three times.
Which is an example of work?
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You’re a smartie pants!
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Question 2A) Be at a constant velo
city in the direction of the force.
B) Accelerate at 9.8 m/s2.
C) Be exerted in the same direction as the object’s motion.
D)Move some distance.
In order to do work on an object, such as pulling a sled, the force must:
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You’re a smartie pants!
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Question 3
A) Yes. A force is a force, no matter what direction it moves. So, you always do work.
B) No. Force must cause motion that is in the same direction as the force.
C) Yes. The force is within us all… Now, where did I leave my lightsaber…?
D) No. You only do work when the force moves the object forward.
If you exert a force, do you always do work?
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Question 4
A) Machines alter the force the pulls objects toward each other (gravity).
B) Machines change the amount of input force required, the input distance required, and/or the direction of a force.
C)Machines overcome friction.
How do machines make work easier if they do not decrease the amount of work you need to do?
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Question 5A) Multiplying input forc
eB) Adjusting gravity to
make the object lighter.
C) Increasing output distance
D)Changing the direction of the input force.
Which is not an example of how a machine can make work easier?
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Question 6A)A wheel.
B)A doorknob.
C)A flashlight.
D)A car.
Which is an example of a simple machine?
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You’re a smartie pants!
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Question 7A) An inclined plane goi
ng up the stairs?B) A lever to raise it up.C) A pulley system.D)A wedge.
To lift a heavy box to the second floor of our school and through a window, would you use:
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References
Science Explorer: Motion, forces, and energy. Teacher’s Edition (2002). Needham, MA: Prentice Hall.
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