20MomentumImpulse

20MomentumImpulse - 20 Momentum and Impulse Conservation...

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20 Momentum and Impulse Conservation laws common: e.g. mass: pour 100 g of vinegar into 100 g of oil. what's the mass of the vinaigrette? Many other physical quantities often conserved momentum angular momentum energy charge
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momentum vector: direction important Newton's 2 nd : p m v The cart’s change of x-momentum is A.–30 kg m/s. B.–20 kg m/s. C.–10 kg m/s. D. 10 kg m/s. E. 30 kg m/s. F = d p dt
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impulse impulse changes momentum J t i t f F t dt = F avg t J = p F avg p f = p i J = m v i F dt p f = 2 kg  1 m / s − 2 N  1 s kg m / s 2 N p f = 0 kg m / s v f = p f m = 0 m / s follow up: workbook 9.6, page 9-2
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Force picture: workbook 9.9b (page 9-4) A falling rubber ball bounces off the floor during fall earth exerts weight on ball force causes downwards acceleration ball exerts (equal!) interaction force on earth
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This note was uploaded on 11/14/2011 for the course MECH 115 taught by Professor None during the Fall '06 term at Kettering.

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20MomentumImpulse - 20 Momentum and Impulse Conservation...

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