# L28 - Remember:ThisWeek Read Ch. 7: Ch. 7.1 7.6, 7.8. Start...

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Remember: This Week Read Ch. 7: Ch. 7.1 – 7.6, 7.8. Start Ch. 8. Read Dr. Dubson’s excellent notes on Ch. 8 ASAP. CAPA assignment #10 is due Friday at 10 PM, to be done on-line. Recitation: Assignment is a Review of Chs. 1-7. Print & bring to Lab. Make-Up Lab Period: Let your TA know. L28 W 3/17/10 1 Physics 2010

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L27 M 3/15/10 Physics 2010 2 Impulse F net = ma = m Δ v Δ t F net Δ t = m Δ v which, if m is constant, can be written = Δ ( mv ) = Δ p Impulse (recall momentum is a vector): I = Δ p  = F net Δ t = change of momentum = net force x time Δ p = 0 if no net force operates during the interaction of two objects. But, what if we only consider a single object or if F net is non-zero?
L27 M 3/15/10 Physics 2010 3 I = Δ p  = F net Δ t A ball bounces off the Foor as shown. The direction of the impulse of the ball, , is B)Straight down, C)To the right, D)To the left, E) Indeterminate. Δ p v 1 v 2 θ θ Note: the angle of incidence is equal to the angle of reflection. p 1 + Δ p = p 2

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L27 M 3/15/10 Physics 2010 4 I = Δ p  = F net Δ t A ball bounces off the Foor as shown. The direction of the impulse of the ball, , is B)Straight down, C)To the right, D)To the left, E) Indeterminate.
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## L28 - Remember:ThisWeek Read Ch. 7: Ch. 7.1 7.6, 7.8. Start...

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