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6-3 Interaction Forces

6-3 Interaction Forces. Identifying Interaction Forces. “For every action, there is an equal and opposite reaction” What is an action, what is a reaction, and why are they equal. Catching a ball. Ball is thrown and then caught by a person Two systems involved???

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6-3 Interaction Forces

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  1. 6-3 Interaction Forces

  2. Identifying Interaction Forces • “For every action, there is an equal and opposite reaction” • What is an action, what is a reaction, and why are they equal

  3. Catching a ball • Ball is thrown and then caught by a person • Two systems involved??? • Hand on ball = F hand on ball • Ball on hand = F ball on hand • F A on B & F B on A • Called action-reaction pairs

  4. Misconception • One force causes action on another: NOT TRUE • Force of the hand on the ball DOESN’T cause the ball to exert a force on the hand. • The two forces exist together or not at all

  5. Newton’s 3rd Law • Interaction pair • Two forces that are in opposite directions and have equal magnitude • Force of the hand on the ball is equal in magnitude and opposite in direction to the force of the ball on the hand • 3rd Law • All forces come in pairs • F A on B = -F B on A

  6. Problems • You lift a bowling ball with your hand, accelerating it upward. What are the forces on the ball? What are the other parts of the action-reaction pairs? On what objects are they exerted? • Force of hand on ball, Fg of earth’s mass on ball • Force of ball on hand, Fg of ball’s mass on earth • Force of feet on earth, force of earth on feet

  7. Four Fundamentals • Given in student power points

  8. Tension of Ropes • Rope holding up a bucket • F T(top on bottom) • F T(bottom on top) • Interaction pair: equal and opposite

  9. Tug of War • If team A pulls with 500 N of force and team B pulls with 500 N of force, what is the total? • F T(A on rope), F T(right on left) = 500 N • F T(B on rope), F T(left on right) = 500 N • Because they are equal and opposite • Tension of rope = 500 N

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