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OCW Scholar - Physics I: Classical Mechanics
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What is the principle of a sucker?
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Why can suckers be hold on walls tightly without falling down to the ground?
When you press on it, you force all the air out. This means that there in now a pressure of 1 atmosphere pressing from the outside.
wow this is quite curious question! How can they suck the blood from animals?
We say "suction cup"... Stan is right; the other part of the answer is that max static friction is equal to mu N, and N is the atmospheric force on the outside of the suction cup.
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