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Posts Tagged ‘Newton’s crade’

I am covering (simple) two body collisions with my mechanics class today. I found this pretty good video of Newton’s cradle to show them some of the principles of conservation of momentum:

When I have more time over the next week I will go through the derivation of the velocities of objects 1 and 2 after a collision when object 2 is stationary before the collision. There are some interesting results which come from these equations, some of which may be a surprise to those who haven’t thought about them before.

The results can explain, amongst other things, how fast you can hit a golf ball for a given golf club head-speed, and why Rutherford and Geiger and Marsden knew the alpha particles they fired at a gold foil in famous 1909 experiment must be striking much more massive particles. This experiment led to the discovery of the atomic nucleus.

Striking a golf ball is a nice example of two body collisions

But that is for next week, this week just enjoy this entertaining video.

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