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Lecture214Week2

# Lecture214Week2 - This Week Gravity Dropping and throwing...

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This Week Gravity: Dropping and throwing objects From Baseballs to satellites What causes motion. All changes involve motion Mass and Weight What’s the difference? Friction good and bad A necessary evil. Extinction of the dinosaurs 8/28/2011 Physics 214 Fall 2011 1

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8/28/2011 Physics 214 Fall 2011 2 One dimensional motion and gravity When we drop an object it’s velocity continues to increase that means there is an acceleration. Near the earths surface the value of this acceleration is g = 9.8m/s 2. This is due to the attractive force of gravity and g does vary over the earth because the earth is not a perfect sphere and because of the rotation of the earth. On the moon g is much smaller The equations of motion are: v = v 0 + at d = v 0 t + 1/2at 2 v 2 = v 0 2 + 2ad d = ½(v + v 0 )t (starting at d =0) + For this case all quantities are +