GEARS 3

INTRODUCTION

There are lots of ways to combine gears. Let's look at a few more.

MATERIALS

1 set of gears

PROCEDURE

1. Try using a crown gear. Look at the set up shown in Figure 1 with two small gears at right angles to each other.

Predict what you think will happen when you turn the driver one turn in the clockwise direction.

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2. Build it and try it out. What happens?

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A STORY

You own a toy store and just got a large shipment of ice skates to sell. You want to make a display in your store window that shows two dolls, dressed up like ice skaters, spinning in place. You have one electric motor that will turn one doll but you'll have to use gears to make the second doll turn. Figure 2 shows how this works.

You build it and it works fine except that one doll spins clockwise and one spins counterclockwise. You want them to both spin the same direction. What can you do?

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There's just one more thing. You want one doll to spin slower and one faster. Any ideas? Try them out with your gear set.

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Draw a sketch of your design here: