PULLEYS 1

HYPOTHESIS

If we had to lift a heavy load, pulleys can make the job easier.

MATERIALS

1 board and pulley 15 weights1 rope
1 small bucket1 pulley1 load
1 large bucket1 clamp2 hooks

PROCEDURE

1. Clamp the board to your desk.

2. Hook the rope to the small bucket.

3. Put the load in the small bucket.

4. Put the rope over the top of the board. See Figure 1.

5. Tie the loose end of the rope to the large bucket. Make the rope short enough so that the large bucket is near the board.

6. GENTLY put the weights into the large bucket one at a time until the load just lifts off the ground. If you can slide a piece of paper under the edge of the small bucket, you have added enough weights.

7. Record the number of weights you needed.

8. Take the weights out of the large bucket and take the buckets off the rope.

9. Repeat this experiment two more times: first use the setup in Figure 2 and then the one in Figure 3.

SETUPWEIGHTS NEEDED
No pulleys
1 pulley
2 pulleys

CONCLUSION

How can pulleys help us?

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