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Ch. 3 & 4 Motion & Forces

Ch. 3 & 4 Motion & Forces. VI. Action and Reaction Newton’s Third Law Momentum Conservation of Momentum. A. Newton’s Third Law. Newton’s Third Law of Motion When one object exerts a force on a second object, the second object exerts an equal but opposite force on the first. NO!!!.

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Ch. 3 & 4 Motion & Forces

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  1. Ch. 3 & 4Motion & Forces VI. Action and Reaction Newton’s Third Law Momentum Conservation of Momentum

  2. A. Newton’s Third Law • Newton’s Third Law of Motion • When one object exerts a force on a second object, the second object exerts an equal but opposite force on the first.

  3. NO!!! A. Newton’s Third Law • Problem: • How can a horse pull a cart if the cart is pulling back on the horse with an equal but opposite force? • Aren’t these “balanced forces” resulting in no acceleration?

  4. A. Newton’s Third Law • Explanation: • forces are equal and opposite but act on different objects • they are not “balanced forces” • the movement of the horse depends on the forces acting on the horse

  5. A. Newton’s Third Law • Action-Reaction Pairs • The hammer exerts a force on the nail to the right. • The nail exerts an equal but opposite force on the hammer to the left.

  6. FG FR A. Newton’s Third Law • Action-Reaction Pairs • The rocket exerts a downward force on the exhaust gases. • The gases exert an equal but opposite upward force on the rocket.

  7. F m A. Newton’s Third Law • Action-Reaction Pairs • Both objects accelerate. • The amount of acceleration depends on the mass of the object. • Small mass  more acceleration • Large mass  less acceleration

  8. JET CAR CHALLENGE CHALLENGE: Construct a car that will travel as far as possible (at least 3 meters) using only the following materials. • scissors • tape • 4 plastic lids • 2 skewers • 2 straws • 1 balloon • 1 tray How do each of Newton’s Laws apply?

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