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Mass and Friction on an Inclined Plane

This is a series of free Physics Video Lessons from Khanacademy online Physics series. We also have another series presented by Brightstorm here.

Introduction to Tension
Finding the normal and parallel components of the gravitational force vector to determine the acceleration of a block down a frictionless inclined plane. See next video for correction on definition of normal force.

Introduction to friction
Correction of definition of "normal force" and an introduction to the coefficient of friction.

Friction on an inclined plane
Calculating the acceleration of on object sliding down an inclined plane with friction.

A more complicated friction/inclined plane problem
Fun with two masses, some wire, a pulley, and a ramp with friction.

Tension in an accelerating system and pie in the face
The second part to the complicated problem. We figure out the tension in the wire connecting the two masses. Then we figure our how much we need to accelerate a pie for it to safely reach a man's face

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