PULLING A FAST ONE!
Prove you are stronger than your friends with a simple pulley system
RN: 10081701 - PHYSICS > FORCES & MOTION
SUITABLE GRADES
3 & 4
DIFFICULTY
2
TIME REQUIRED
<12 hrs
SUPERVISION
ADVISED
INTRODUCTION [METHOD]
Do you think you are stronger than two of your friends? No? You may be stronger than you realize! With a little help from a simple pulley system designed to magnify effort, or pull, you may just be able to prove that you are stronger than two of your friends put together.
STUFF YOU NEED [MATERIALS]
- ROPE
- 2x BROOM STICKS
- 2x FRIENDS
HOW TO PROCEED [PROCEDURE]
- Take the two brooms or long rods of similar strength and give one to each of your friends to hold.
- Tie the rope to the end of one of the broom sticks and wrap the rope around the two broom stick handles a number of times as shown in the figure above.
- Ask your friends to pull on the broom handles as hard as they can while you hold onto the end of the rope tightly.
- To their, and possibly your, surprise your friends will not be able to pull the broom handles apart as long as you hold onto the end of the rope tightly. You will actually be able to pull the two handles together with quite little effort, no matter how hard your friends would try to pull them apart!
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GLOSSARY [TERMS]
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