Understanding Newton's Third Law of Motion
Explore Newton's Third Law of Motion stating that every action has an equal and opposite reaction, illustrating forces as paired actions influencing motion. Learn through examples like kicking a desk or a hammer hitting a nail, and grasp the concept of forces "on" and "by" objects.
Understanding Newton's Third Law of Motion
E N D
Presentation Transcript
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).
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.
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)
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.
