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lecture4_light_rel_08c

# lecture4_light_rel_08c - Newton acceleration Newton's 1st...

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05/07/09 Physics 6 - Spring 08 - G.R. Goldstein 1 Newton & acceleration Newton’s 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 Newton’s 2nd Law a due to force of gravity = 9.8 m/s 2 = g always downward

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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 - ½gt 2 (over t, average v=-gt/2 so vertical distance=v ave t=-gt 2 /2) so height of falling object y=h -½gt 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

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05/07/09 Physics 6 - Spring 08 - G.R. Goldstein 4 Acceleration due to gravity a due to force of gravity = 9.8 m/s 2 = g always downward
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