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Old 01-08-2013, 09:18 PM   #19
sureshs
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Join Date: Oct 2005
Posts: 32,878
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Very interesting, and something I wanted to do for a long time.

Do you know what is the main cause of friction? Your weight. The frictional force is usually a coefficient (less than 1) times the weight.

So this is a physics question I always had. If a person standing on a scale tenses his leg muscles to try to "increase" the force on the ground, will the scale show a higher reading? No.

I just tried it now and it is confirmed.

So, pressing against the ground cannot increase friction.

It can only provide a springboard to rise.
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