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Newton’s Third Law

Newton’s Third Law. Newton’s Third Law of Motion. Whenever one object exerts a force on a second object, the second object exerts an equal and opposite force on the first. “To every action there is an equal and opposite reaction” F(AB) = - F(BA)

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Newton’s Third Law

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  1. Newton’s Third Law

  2. Newton’s Third Law of Motion • Whenever one object exerts a force on a second object, the second object exerts an equal and opposite force on the first. • “To every action there is an equal and opposite reaction” • F(AB) = - F(BA) • Forces come in pairs. In nature there is no single force (all by itself).

  3. Examples • I exert a force on a desk with my foot and the desk exerts a force back on my foot. (“I kick a desk and the desk kicks me back.”) • A hammer exerts a force on a nail and the nail exerts a force back on the hammer.

  4. Force “on” and “by” • A force influences the motion of an object only when it is applied on that object. A force exerted by a body does not influence that body (itself); it only influences the OTHER body on which it is exerted. • F(AB) = - F(BA)

  5. Group Activity • 1. Explain walking forward on East Bottom. • 2. Explain birds flying south. • 3. Explain a rocket lifting off Cape Canaveral. • 4. A person throws a package out of a boat (initially at rest). • 5. A bat exerts a 50 N force on a baseball. • 6. An inflated, but untied, balloon flies off. • 7. Earth exerts gravitation on the moon.

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