lecture1 - Understanding Mechanical Forces Example: Pushing...

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Understanding Mechanical Forces Example: Pushing a coke bottle F Normal F Push mg Where does F Push come from?
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And how does a muscle do this? When a muscle is told to contract a specific series of events take place leading to specialized proteins, actin and myosin, gripping onto each other and forcibly sliding one past the other. oo e a oe a d o b y s d g o e p a s e oe yosin ATP Myosin Actin Helix www.sci.sdsu/movies/actin_myosin_gif.html Still a contact force - even at the molecular level
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Beyond molecules we find atoms Atoms consist of a nucleus made of particles called protons and neutrons pa es a ed p o o s a d eu o s surrounded by a cloud of electrons. Size of the nucleus: ~10 -15 m Size of the electron cloud: ~ 10 -10 m Lot’s of empty space! The force between e and p must be: A field force Attractive (binds e and p) Repulsive (atoms stay separate) This force is caused by a new property of matter: Electric Charge
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This note was uploaded on 06/03/2011 for the course PHY 112 taught by Professor Beacom during the Spring '11 term at Ohio State.

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lecture1 - Understanding Mechanical Forces Example: Pushing...

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