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Newton’s Third law of motion

Newton’s Third law of motion. Pushing and Pulling Back. REVIEW F=ma What do you need for an acceleration to occur?. Pushing and Pulling Back. Investigate Part A: Pushing against the wall In which direction did you or your classmates push?

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Newton’s Third law of motion

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  1. Newton’s Third law of motion

  2. Pushing and Pulling Back • REVIEW • F=ma • What do you need for an acceleration to occur?

  3. Pushing and Pulling Back • Investigate Part A: Pushing against the wall • In which direction did you or your classmates push? • How did you/they move in the opposite direction that you/they pushed? • What pushed the student away from the board/wall?

  4. Pushing and Pulling Back • Investigate Part A: Pushing each other • In which direction did Student A push? • In which direction did Student B push? • How did they move in the opposite direction that they pushed?

  5. Pushing and Pulling Back • Investigate Part A: Thought Experiment • Which way does your foot push? • What causes you to move forward?

  6. Pushing and Pulling Back • Investigate Part A: Spring Scales • Was the force of the spring scales always equal?

  7. Pushing and Pulling Back: Vocabulary Newton’s Third Law of Motion – forces come in pairs; the force of object A on object B is equal in strength and opposite in direction to the force of object B on object A

  8. Pushing and Pulling Back • Investigate Part B: Inanimate Objects Pushing?

  9. Pushing and Pulling Back: Vocabulary Free-body Diagram – a diagram showing the forces acting on an object. Center of Mass – the point at which all the mass of an object is considered to be concentrated Newton’s Third Law of Motion – forces com in pairs; the force of object A on object B is equal in strength and opposite in direction to the force of object B on object A.

  10. Pushing and Pulling Back • Identifying the Opposite and Equal Forces of Newton’s Third Law

  11. Pushing and Pulling Back • Challenging Newton’s Third Law • How can I move a chair if it pulls back with the same amount of force with which I’m pulling?

  12. What do You Think Now? • Pretend that you have just met somebody who has never jumped before. What instructions could you provide to get the person to jump up (that is, which way do you apply the force when you push with your feet)?

  13. Newton's Laws Of Motion (3):Action And Reaction • http://youtu.be/cP0Bb3WXJ_k

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