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Newton’s 3 rd Law. Action and Reaction. Force Pairs. A force is always applied by a secondary object The object to which the force is applied also exerts a force back on the initial object Whenever there is one force, there is a second force. Newton’s 3 rd Law.

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## Newton’s 3 rd Law

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**Newton’s 3rd Law**Action and Reaction**Force Pairs**• A force is always applied by a secondary object • The object to which the force is applied also exerts a force back on the initial object • Whenever there is one force, there is a second force**Newton’s 3rd Law**• Whenever one object exerts a force on a second object, the second object exerts an equal and opposite force back on the first • For every action, there is an equal and opposite reaction • The “action” and “reaction” forces act on different objects, this results in a different acceleration for both**Examples of Action and Reaction**• A book pushing down on a desk with 10 N • An ice skater pushing against the railing • A rocket engine • Car • Walking**Example 1**• Two carts, one with a mass of 3 kg, and the other with a mass of 1 kg are sitting end to end on a desk. One the “explodes” and exerts a force of 50N on the other, what is the acceleration of each?**Example 2**• Two blocks are attached by a string; block A is on the left and has a mass of 20 kg, block B on the right and has a mass of 10 kg. Block A is pulled with a force of 60 N (W). Find the acceleration of the two blocks and the tension on the string between the two.

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