1 / 13

Chapt.7: Newton’s Third Law

Chapt.7: Newton’s Third Law. 7.1 Interacting Objects 7.2 Analyzing Interacting Objects 7.3 Newton’s Third Law 7.4 Ropes and Pulleys 7.5 Examples of Interacting-Objects Problems.

etenia
Download Presentation

Chapt.7: Newton’s Third Law

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. Chapt.7: Newton’s Third Law 7.1 Interacting Objects 7.2 Analyzing Interacting Objects 7.3 Newton’s Third Law 7.4 Ropes and Pulleys 7.5 Examples of Interacting-Objects Problems

  2. Stop to think 7.1 P189Stop to think 7.2 P191Stop to think 7.3 P194Stop to think 7.4 P195Stop to think 7.5 P198Stop to think 7.6 P202 • Example 7.3 P190 • Example 7.5 P195 • Example 7.6 P197 • Example 7.9 P200 • Example 7.10 P201

  3. Interacting system

  4. Systems and the environment

  5. pushing a crate A person pushes a crate across a rough floor

  6. Newton’s third Law • Every force occurs as one member of an action/reaction pair of forces • 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

  7. 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

  8. What is the tension in the rope?

  9. 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

  10. More diagrams (Massless String)

  11. 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

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

More Related