PULLEYS 2

HYPOTHESIS

You don't get something for nothing! Pulleys make it easier to lift heavy loads, but at a price: you can't lift the load as fast.

MATERIALS

1 board and pulley2 rulers 1 rope
1 small bucket1 pulley1 load
2 hooks1 clamp

PROCEDURE

1. Prepare the setup as shown in Figure 1.

2. Hold the loose end of the rope right where it comes out of the pulley. The rope should be tight, but the load should still be on the floor.

3. Hold one of the rulers so that one end is right by your hand. See Figure 2.

4. Pull the rope 12 inches to the other end of the ruler and hold it here.

5. While you hold the rope still, have your partner measure the height of the bottom and record it.

6. Repeat these steps with the 2 pulley setup that we used in the previous experiment. Be careful to pull the rope exactly 12 inches.

SETUPHEIGHT OF LOAD (inches)
1 pulley
2 pulleys

CONCLUSION

What are two differences between using one and two pulleys?

______________________________________________________

______________________________________________________

______________________________________________________

______________________________________________________