This Week•Gravity: Dropping and throwing objectsFrom Baseballs to satellites•What causes motion. All changes involve motion•Mass and WeightWhat’s the difference?•Friction good and badA necessary evil.•Extinction of the dinosaurs8/28/2011Physics 214 Fall 20111
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8/28/2011Physics 214 Fall 20112One dimensional motion and gravityWhen 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/s2. 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 smallerThe equations of motion are:v = v0 + at d = v0t + 1/2at2v2= v02+ 2ad d = ½(v + v0)t(starting at d =0)+For this case all quantities are +