Title: Chapt'8: Newtons Third Law
1Chapt.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
2Interacting system
3Systems and the environment
4Newtons 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
5Atwood 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
6More diagrams (Massless String)
7Questions (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
8P. 8.8
Notice if there is an acceleration, F(G on c) is
not equal F(T on C)
9(No Transcript)
10Write Newtons second law for boy and package
- For boy
- For Package notice the x direction is along the
- Ramp