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Understanding Newton’s 3rd Law: Action and Reaction Force Pairs

Learn about Newton’s 3rd Law and how forces interact with each other, leading to equal and opposite reactions. Explore examples and calculations to grasp the concept effectively.

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Understanding Newton’s 3rd Law: Action and Reaction Force Pairs

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  1. Newton’s 3rd Law Action and Reaction

  2. 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

  3. 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

  4. 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

  5. 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?

  6. 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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