lecture4_light_rel_08c

lecture4_light_rel_08c - 05/07/09 Physics 6 - Spring 08 -...

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Unformatted text preview: 05/07/09 Physics 6 - Spring 08 - G.R. Goldstein 1 Newton & acceleration Newtons 1st Law: body remains in uniform motion unless acted upon by (net) force Non-uniform means v changes (magnitude or direction) Changing v over time is acceleration (response to force) a = change of v / t elapsed or v/t for constant a F =m a Newtons 2nd Law a due to force of gravity = 9.8 m/s 2 = g always downward 05/07/09 Physics 6 - Spring 08 - G.R. Goldstein 2 Acceleration due to gravity a due to force of gravity = 9.8 m/s 2 = g always downward Vertical motion on earth (gravity alone) downward velocity increases at constant rate ( v=-gt ) vertical downward distance increases as - gt 2 (over t, average v=-gt/2 so vertical distance=v ave t=-gt 2 /2) so height of falling object y=h -gt 2 Example: Dropping ball from height 5.0 meters. How long to fall to the ground? 05/07/09 Physics 6 - Spring 08 - G.R. Goldstein 3 05/07/09 Physics 6 - Spring 08 - G.R. Goldstein 4 Acceleration due to gravity a due to force of gravity = 9.8 m/sdue to force of gravity = 9....
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This note was uploaded on 03/29/2008 for the course PHY 006 taught by Professor Goldstein during the Spring '08 term at Tufts.

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lecture4_light_rel_08c - 05/07/09 Physics 6 - Spring 08 -...

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