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Forces come in two types.

Forces come in two types. Contact forces Field forces How about forces in Pairs!. Newton’s Third Law.

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Forces come in two types.

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  1. Forces come in two types. • Contact forces • Field forces • How about forces in Pairs!

  2. Newton’s Third Law There is one more important piece to the dynamic and static model. It is called Newton’s Third Law. Forces come in pairs. Understand Newton’s Third law, we can ignore internal forces, and then only search for external forces acting on the object.

  3. Push Me and I Push Back!!!

  4. Push me and I push back! • For example, with the palm of your hand, push on a book, desk or table. You are exerting a force on the object you are pushing. At the same time, you can feel a force on your hand. There seems to be two forces: the one your hand exerted on the object, and another force on your hand. • What is the relationship between these forces?

  5. The man weighs 700 N. The force exerted by the table on the man is: • a)Larger than 700 N • b)Equal to 700 N • c)Smaller than 700 N • d)There is no force.

  6. A hand pushes on a balloon against a wall with a force of 10 N. The force exerted by the balloon on the hand is: • a)Larger than 10 N • b)Equal to 10 N • c)Smaller than 10 N • d)There is no force.

  7. A building is being torn down. The wrecking ball smashes through a wall. Does the ball put a larger force on the wall than the wall puts on the wrecking ball? Explain your answer.

  8. Imagine that you hold the two force probes, one probe in each hand. You will notice that each force probe has a hook on it. Connect the two force probes together and pull as seen in the following figure.

  9. Newton's Third Law • Why does it seem that a bug hits a windshield with more force than the windshield hits the bug? • The effect on the bug is worse than the effect on the windshield but the force is still the same!

  10. Forces come in pairs…. But which pair? • Forces come in pairs • An example would be the weight and normal force. • Fg vs. Fg’ and Fn vs. Fn’ • Weight and Normal Force are not Force Pairs!!!

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