This video introduces the notion of torque.
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Moments

by Sal Khan
This video defines a moment and begins calculations with it.
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Moments (part 2)

by Sal Khan
This video continues the moment calculations begun above,.
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This video introduces unit vector notation and shows how it can be useful.
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This video continues calculations using unit vector notation.
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This video returns to projectile motion problems using the device of unit vector notation.
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This video continues with the solution to a problem concerning projectile motion using unit vector notation.
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This video introduces a new notation to projectile motion: ordered sets.
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