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10_25_Momentum_2_Again - 10/25 Momentum 2 Again 0 Text...

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10/25 Momentum 2 Again 0 Text: Chapter7 (and 6 for Energy) 0 Presentation “Colliding Rockets” delayed a day 0 Upcoming presenters please see me 0 HW “Energy and Momentum” Due Friday 10/26 (do some today) 0 HW “Impulse” Due Monday 10/29
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Momentum and the 2nd Law v f = v i + a t mv f = mv i + ma t mv f = mv i + F net t Impulse We used definition of acceleration and the 2nd law to define momentum and impulse . Momentum, p v = a t 2nd Law (No letter for this)
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Momentum and the 2nd Law mv f = mv i + F net t mv f - mv i = F net t m(v f - v i ) = F net t m( v) = F net t (divide by t and get 2nd law) p = F net t Changes in momentum equal impulse
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Example: p = m( v) = F t 3 kg v i = 4 m/s 3 kg v f = 6 m/s p = ? 6 kg m/s right 3 kg v f = 4 m/s 3 kg v i = 6 m/s p = ? 6 kg m/s left 3 kg v f = 4 m/s 3 kg v i = 6 m/s p = ? 30 kg m/s left Before After
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Momentum A B A B A B Mass 1 kg 3 kg Speed Before 8 m/s 2 m/s Speed After 1 m/s 5 m/s p A,i = 8 kg m/s p A,f = 1 kg m/s p A = 9 kg m/s left p B,i = 6 kg m/s p B,f
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