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Newton’s 3 rd Law of Motion Action - Reaction

Newton’s 3 rd Law of Motion Action - Reaction. Chapter 6.3. Newton’s 2 nd Law ( a = F/ m). Newton’s second law is responsible for explaining how objects increase or decrease in speed, or change direction. If the force is , the object will . If the mass is , the object will more .

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Newton’s 3 rd Law of Motion Action - Reaction

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  1. Newton’s 3rd Law of Motion Action - Reaction Chapter 6.3

  2. Newton’s 2nd Law (a = F/m) • Newton’s second law is responsible for explaining how objects increase or decrease in speed, or change direction. • If the force is , the object will . • If the mass is , the object will more . • When an object , it is also said to be . Huh? You will see… • Newton’s 2nd Law can also be used to explain the forces that exist on stationary objects like your weight or the repulsive and attractive forces of two magnets.

  3. What is the of a ? • If you pull on a rope, do you feel the rope pull on you? • Which is the source of the force, you or the rope?

  4. All forces exist in (no ) that are in and equal in magnitude (size). • When you kick a ball, you exert a force on the while the exerts a force on you. • You pull on a to open it while the exerts a force on you. • A exerts a force on a nail while the exerts a force on the hammer. • When you on a rope, it on you.

  5. Newton’s Law of Motion • When one object exerts a force on another object, the second object exerts an equal but oppositely directed force on the first object. • For there is an . (Newton’s ____ Law is sometimes referred to as the “ of - .”)

  6. Free Body Diagram of Newton’s 3rd Law of Motion = Note that the forces come in that have .

  7. Action - Reaction - - - - - - - - Reaction Action = = = Note: All forces come in and pairs

  8. What is the Force? • You push on your desk. • The on you. • An airplane propeller pushes on the air. • The on the airplane propeller. • A tennis racquet hits a ball. • A a tennis racquet. • You push on the floor as you take a step. • The back on you.

  9. Force of floor on person. Force of person on floor. Do the forces cancel each other out? • . • Since the forces act on , it is possible for them to each other out. Ff = mfaf Fp = mpap

  10. Newton’s 3rd Law of Motion & Acceleration • Newton’s 3rd Law of Motion says that ____ = ____ • And Newton’s 2nd Law of Motion says that ______ = ______ • While the forces may be but opposite in direction, the of each object may be .

  11. Example: Newton’s 3rd Law of Motion A physics student is pulling on a rope, which in both cases causes the scale to read 500 Newtons. The physics student is pulling a. with more force when the rope is attached to the wall. b. with more force when the rope is attached to the elephant. c. the same force in each case.

  12. Newton’s 3rd Law of Motion? • Does the following diagram illustrate an action-reaction pair? • , because both forces act on the object. =

  13. Key Ideas • Newton’s 3rd Law of Motion states that when two objects interact, the magnitude of the force exerted by object 1 on object 2 is to the of the force simultaneously exerted by object 2 on object 1, and are in directions. • Newton’s 3rd Law of Motion is also known as the of -. • All forces in nature come in . • While the forces are equal and opposite, they do each other out because the two forces act on objects.

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