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Chapt'8: Newtons Third Law

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8.4 Ropes and Pulleys. 8.5 Examples of Interacting-System problems. Interacting system ... Neglect rope and pulley's mass. More diagrams (Massless String) ... – PowerPoint PPT presentation

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Title: Chapt'8: Newtons Third Law


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

2
Interacting system
3
Systems and the environment
4
Newtons 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

5
Atwood machine
Neglect rope and pulleys mass
(1) Compare a1 an a2 (2) Compare T1 and T2 If m2
gtm1 (3) Draw the free body diagrams
6
More diagrams (Massless String)
7
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
8
P. 8.8
Notice if there is an acceleration, F(G on c) is
not equal F(T on C)
9
(No Transcript)
10
Write Newtons second law for boy and package
  • For boy
  • For Package notice the x direction is along the
  • Ramp
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