Free Fall Resource

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http://www.youtube.com/watch?v=j1TOMsUG4T

The video begins with a definition of free fall. He explains that the only force on an object in free fall is gravity (10N), so the object's acceleration is 10 m/s/s. He then tells us the initial speed of the object is 0 m/s. He uses a speedometer and and odometer to tell us the velocity and distance of the object at each time interval. Later, he explains his data using equations, including the equations for acceleration (a = Δv/ Δt), distance (d = 1/2gt², and velocity (v = gt).

Newton's Second Law Resource

<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.