Section 2.3 Forces act in pairs

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Presentation transcript:

Section 2.3 Forces act in pairs

Newton’s Third Law When one object exerts a force on another object, the second object exerts an equal and opposite force on the first object.

Action/Reaction Pair The force that is exerted on an object and the force the object exerts back.

Action and Reaction forces Versus balanced forces act on one object Action and Reaction forces Act on 2 different objects

Give examples of both Balanced Forces Action/Reaction

Newton’s three laws can explain and predict motion.

2.3 Review questions ON PAGE 38 in your ISN Demonstrate your understanding of Newton’s third law and section 2.3 WRITE YOUR SUMMARY!!!

2.3 Review Questions The force of the ball on your hand, the force of your hand on the ball. Balanced forces act on one object, and each cancels the effect of the other. Action and reaction forces act on two different objects. Force exerted by cat overcome’s cat’s inertia Force cat needs to accelerate depends on its mass. When running, cat applies backwards force on ground and ground applies forward force on cat

2.3 Review Questions 4. 50 N in direction opposite to his force on the wall 5. It is incorrect, the reaction force doesn’t act on the box, it acts on Jim 6. Before: no change in velocity = 0 m/s2 After: a = F/m = 10 N/50 kg = 0.2 m/s2