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Unformatted text preview: L ECTURE 5: N EWTON ’ S 3 RD L AW • Newton’s 2nd (review) • Newton’s 3rd law of motion • Distinguishing the 2nd and 3rd laws • Damage in collisions 1. A strong offensive lineman pushes the defensive lineman straight back. If the net force is doubled, the acceleration of the defensive lineman (a) quadruples (b) doubles (c) stays the same (d) halves (e) none of these 2. A tennis serve is returned; the ball leaves the racket at 20 m/s. If the ball was struck from rest so that it left the racket with the same speed of 20 m/s, would it take more or less force? (a) More from rest (b) Less from rest (c) Same in both cases 3. A gymnast hangs from a pair of rings. The upward support forces of the rings are (a) each equal to half her weight. (b) each equal to her weight. (c) add up to equal her weight. Newton’s 3rd Law of Motion For every force that is exerted by one body on another there is an equal and opposite force exerted by the second body on the first. –Hay, p. 68 ~ F AB = ~ F BA ActionReaction Pairs in Newton’s Third Hewitt. Sports ActionReaction Pairs Hay. Newton’s Third is Less Evident when the Masses Differ Dyson. If the forces are equal, who wins?...
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 Fall '08
 Mcwilliams,R
 Physics, Force, Mass

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