Lecture 9 PowerPoint - Today Newtons third law and...

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1 Today Newton’s third law and associated di ffi culties 1
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Interactions -- Newton’s 3rd Chapter 3: “Forces require an agent.” Big Idea: All forces come in pairs. The force pair (‘action/reaction pair’) is due to two objects exerting a force on each other. 2
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Newton’s 3rd Law Whenever one object exerts a force on a second object, the second object exerts an equal and opposite force back on the first. Interaction: No exceptions : Forces between two interaction partners are always equal in magnitude. Force object 2 exerts on object 1 Force object 1 exerts on object 2 3
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Examples 1. You push against the wall, the wall pushes back with the same force: A pair of elastic forces . 2. A jumping girl has weight due to attraction by Earth but Earth is also attracted by the girl: A pair of gravitational forces. 3. Two charged objects attract or repel each other: A pair of electrostatic forces. F EonG F GonE Notice: The interacting forces are of the same kind , act simultaneously , and act on two different objects . 4
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What, if anything, is wrong with the force diagram for a bicycle that is accelerating toward the right? A. It does not draw each object separately. B. It draws interactions between one body and itself. C. It fails to identify all relevant forces. D. Nothing is wrong. WS6 Q2: The dotted lines are supposed to indicate interaction pairs. 5
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What, if anything, is wrong with the force diagram for a bicycle that is accelerating toward the right?
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