PHY-1150 Lecture 26: Finish 7.2, 7.3 Newton's Third Law

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30 Sep 2016

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PHY 5

Chapter 7

Finishing up Propulsion

• Direction of friction for a person walking pushing a crate

o Direction to prevent slipping

• Action/reaction pair

o Action is the foot pushing back on the ground

o Reaction is the ground pushing the person forward

• Car’s motor spins tires in opposite direction to move it forward

o Kicks dirt/ gravel backwards

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