Rotation

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Introduction:
We use levers because of a Force-Distance Tradeoff. If you want to increase your output FORCE, you must increase you input DISTANCE. Wheel/Axles and Screws also work this way.

Activity:
Try the wheel/axle and screw samples provided by your teacher. Then measure the input and output distances using string.

__DIAGRAM/EXPLANATION__ How is a screw like a lever? OR How is a wheel and axle like a lever? OR The Archimedean Screw used rotational action to move water up a pipe. Why didn't they just lift it directly? OR "In the financial news, I keep hearing about "leveraged buyouts", but I don't know what they mean. Maybe you can help by explaining the concept of leverage. Help!"

Use the concepts of FORCE-DISTANCE TRADEOFF in your answers!

Conclusion:
When you know the input and output distances, you can calculate a machine's Mechanical Advantage!

Enrichment:
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