Science

This test bed was made for a science project at school called:

W = F x S
Work is Force times Distance

The theory is work is force times distance. I tried to prove this by showing that if the distance is longer then the force needed is smaller.

First you could see how a pulley can decrease the force. Then you could see how gears can do the same as pulleys.


	Following my experiment guide people could first try to lift a bucket with weights without a pulley and note the max weight. Then they were asked to mount the pulley and see how the pulley increased the distance. Then they would see how much they could lift with the pulley. After that people were asked to do the same with a large and a small gear.


		I marked old batteries for weights






			I made a switch box to help people control the pulley and gear sides


	This experiment is good because it works every time. It took some time to go through the entire experiment - so only few did all the steps. Also some students and parents did not understand the experiment well. Still, it was a great success at the fair - especially the boys in my class really wanted to try it out.

There was an extra question at the end about gear math. People were told about gear math during the experiment.

Then they were asked:

If the three gears in this gear train all have a ratio of 1:2; then how many times will the large wheel at the end turn, when you turn the crank once?

Try it and E-mail me your answer!


	Click here to see the Test Bed RCX Code


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