non-linear power point 7 th grade super review by: ms. stipa

Non-linear Power Point

7th Grade Super ReviewBy: Ms. Stipa

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.

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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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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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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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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