Materials Required:
l 2 broomsticks
l Rope
2 adults
Procedure:
- Ask 2 adults to stand several feet apart and give each of them a broomstick. Tie one end of a rope to one of the broomsticks.
- Weave the rope back and forth between the sticks several times.
- Tell the adults to try to pull the broomsticks apart—while you easily move the 2 poles together by pulling on the free end of the rope.
This Is What Happens:
This setup is called a block and tackle. The force of your strength is increased each time the rope is looped around the poles, and so you appear to be stronger than 2 adults! Block and tackles are used to lift heavy items like machinery and pianos.
