Chapter 5Newton’s Third Law of Motion and Adding up Forces at anglesFor every “action” there is a “reaction”…
Newton’s Third Law of MotionWhenever an object exerts a force on a second object, the second object exerts a forceof equal magnitude in the opposite direction on the first object.First Object(Hammer)Second Object(Nail)
CheckA 1-ton car, going 60 km/h hits a 3-ton truck, going 40 km/h. •On which vehicle is the force of impact greatest?•On which vehicle is the change in velocity greatest?•By what principles of physics?
Action and ReactionA common expressionof Newton’s 3rdLaw is:To every action there’s an equal and opposite reaction.What’s an “action”? How can reaction be “equal” and“opposite”?
Action-Reaction Pairs????????????????Here are some examples of action-reaction pairs.Think of examples of an object exerting a force on a second object.Practice identifying action-reaction pairs.
Another example: Mutual PushSituation 1: Mr. A and Mr. B push against each other.