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

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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.

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? NO!!!  Aren’t these “balanced forces” resulting in no acceleration?

A. Newton’s Third Law  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 Explanation:

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.

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. FGFG FRFR

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