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# Ex_jp-com - 2D Particle Kinetics Impulse and Momentum (I)...

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2D Particle Kinetics – Impulse and Momentum (I) Momentum 22 2 , 2 x xy y x y pm pm m p m K υ υυ == = =+ = = G G (II) Impulse For a single constant force : JF d F t t J = Δ G G GG (III) Impulse-momentum equation 12 1 2 1 2 1 1 For a single constanr force : xx x x x x yy y y 2 2 x x y y y y pJp m F t m m m Jm m m t J Fm += + Δ += ⇒ = + Δ = ⇒+ = G Example – Impact A 0.15 Kg baseball is traveling with a velocity of m/s just before impact with the bat. Immediately after the impact, the velocity of the baseball is detected to be m/s. When struck by the bat, the baseball is in contact with the bat for 5 ms. Find (a) the x - and y - components of the impulse by the bat on the baseball during impact, and (b) the x - and y - components of the average impact force by the bat on the baseball. ˆ 40 5 i −− ˆ j ˆ j ˆ 55 25 i + ( Ans : (a) J x = 14.25 Ns,

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## This note was uploaded on 04/12/2008 for the course PHYS 2305 taught by Professor Tschang during the Spring '08 term at Virginia Tech.

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Ex_jp-com - 2D Particle Kinetics Impulse and Momentum (I)...

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