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Newton’s rd 3 Law of Motion Unit Standards 5.P.5A.1 Use mathematical and computational thinking to describe and predict the motion of an object (including position, direction, and speed). 5.P.5A.2 Develop and use models to explain how the amount or type of force (contact and non-contact) affects the motion of an object. 5.P.5A.3 Plan and conduct controlled scientific investigations to test the effects of balanced and unbalanced forces on the rate and direction of motion of objects. 5.P.5A.4 Analyze and interpret data to describe how a change of force, a change of mass, or friction affects the motion of an object. 5.P.5A.5 Design and test possible devices or solutions that reduce the effects of friction on the motion of an object. What is Newton’s Third Law? • When one object pushes on a second object, the second pushes back on the first with the same strength. What is Newton’s Third Law? • Action forcethe push of the first object on the second object • Reacting forcethe push of the second object back on the first object What is Newton’s Third Law? • Newton’s Third Law of Motion- All forces occur in pairs, and these two forces are equal in strength and opposite in direction. What is Newton’s Third Law? • More commonly people say “for every action there is an opposite but equal reaction.” What is Newton’s Third Law? • It is important to remember that action and reaction forces are not balanced forces. This is because action and reaction forces always act on separate objects. What is Newton’s Third Law? • When you sit in a chair, your weight is pushing down on the chair. A reaction force from the chair pushes back up on you. This reaction force is what you feel as your weight. What is Newton’s Third Law? • When you are falling the force of gravity is still acting upon you. You do not feel gravity because there is nothing providing a reaction force. This is why you feel “weightless” when you are in a free fall.