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Chapt.8: Newton’s Third Law

Chapt.8: Newton’s Third Law. 8.1 Interacting Systems 8.2 Identifying Action/Reaction pairs 8.3 Newton’s Third Law 8.4 Ropes and Pulleys 8.5 Examples of Interacting-System problems.

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Chapt.8: Newton’s Third Law

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  1. Chapt.8: Newton’s Third Law 8.1 Interacting Systems 8.2 Identifying Action/Reaction pairs 8.3 Newton’s Third Law 8.4 Ropes and Pulleys 8.5 Examples of Interacting-System problems

  2. Stop to think 8.1 P213Stop to think 8.2 P215Stop to think 8.3 P218Stop to think 8.4 P220Stop to think 8.5 P223Stop to think 8.6 P227 • Example 8.3 P215 • Example 8.5 P219 • Example 8.6 P222 • Example 8.8 P224 • Example 8.9 P226

  3. Interacting system

  4. Systems and the environment

  5. Newton’s third Law • Every force occurs as one member of an action/reaction pair of corces • The two members of an action/reaction pair act on two different objects • The two members of an action/reaction pair are equal in magnitude but opposite in direction

  6. Stop to think 8.3: Boxes A and B are sliding to the right across a frictionless table. The hand H is slowing them down. The mass of A is larger than the bass of B.. Rank in order , from largest to smallest, the horizontal forces on A, B, and H. a. F B on H = F H on B = F A on B = F Bon A b. F B on H = F H on B > F A on B = F Bon A c. F B on H = F H on B < F A on B = F Bon A d. F H on B = F H on A > F A on B

  7. Atwood machine Neglect rope and pulley’s mass (1) Compare a1 an a2 (2) Compare T1 and T2 If m2 >m1 (3) Draw the free body diagrams

  8. More diagrams (Massless String)

  9. Questions: (1) if there is friction force between A and table, what is equation for A (2) For what condition, B is at rest (3) when is the weight of B equal tension T

  10. P. 8.8 Notice if there is an acceleration, F(G on c) is not equal F(T on C)

  11. Write Newton’s second law for boy and package For boy: For Package: notice the x direction is along the Ramp

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