<iframe width="560" height="315" src="//www.youtube.com/embed/nJTKiS444BQ" frameborder="0" allowfullscreen></iframe>
http://www.youtube.com/watch?v=nJTKiS444BQ
This video describes Newton's Second law by giving an example of a kicker on a football team. It tells us how the equation f=ma can be applies to kicking a football, and what exactly is happening when the kicker applies force to the ball.
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