lecture17_1100_S12

# lecture17_1100_S12 - PHYS 1100 Spring 2012 I II Newtons...

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I. Newton’s Third Law II. Newton’s Second Law Examples with Multiple Objects PHYS 1100 Spring 2012 Reading for Friday: 2.1 – 2.6, 4.1 – 4.4

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Newton’s Third Law For each action, there is an equal and opposite action. PHYS 1100 Spring 2012
Newton’s Third Law For a force that object A exerts on object B, there is a force of the same type that has the same magnitude but points in the opposite direction that object B exerts on object A. PHYS 1100 Spring 2012 E g F F 1 by on, type, MUST satisfy to be a Newton’s Third Law Pair Equal magnitude Opposite direction Same type of force Which object “feels” force and which object “causes” force switched

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EX1: Three identical blocks are pushed to the right across a frictionless horizontal surface by a horizontal force F . Two of the blocks sit side by side, while the third block sits on the top of the block being pushed. PHYS 1100 Spring 2012
GW1: Three boxes of mass m 1, m 2, and m 3 are pushed to the right across a frictionless horizontal surface by a horizontal force. Draw the FBDs for the three individual masses and the system.

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