p140w07_ct_18 - Racquetball Striking a Wall Copyright:...

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Physics 140: Winter 2007 Lecture #18 March 15, 2007 Dave Winn Racquetball Striking a Wall Copyright: Loren M. Winters Mt. Etna Andrew Davidhazy
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Does gravity really cause all things to pull together? The “Cavendish” experiment: allowed measurement of the constant G 2 Earth Earth r GM g = Unknown Known Called “Weighing the Earth” 2 12 1 2 r m GM F grav = 1 2 2 12 m M r F G grav =
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Strength of gravity • This constant G is small: 6.67x10 -11 Nm 2 /kg 2 • Two 1 kg objects one meter apart: • Gravitational forces become large only when the mass of at least one object becomes large • Gravity always becomes stronger when you add more material: on large scales it’s all that matters N x m kg kg G F grav 11 2 10 67 . 6 ) 1 ( ) 1 )( 1 ( = =
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The magnitude of the acceleration of a satellite in orbit around the Earth is proportional to: 1. The mass of the satellite 2. The mass of the Earth 3. The product of the mass of the satellite and the mass of the Earth a r GM a m r m GM F Earth s s Earth grav = = = 2 2
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This note was uploaded on 04/04/2008 for the course PHYSICS 140 taught by Professor Evrard during the Fall '07 term at University of Michigan.

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p140w07_ct_18 - Racquetball Striking a Wall Copyright:...

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