lecture26[1] - Collisions Conservation of Momentum Elastic...

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1 Physics 1D03 2 Serway 9.3 - 9.4 Collisions • Conservation of Momentum • Elastic and inelastic collisions For practice: Chapter 9, problems 5, 19, 25, 29, 35 Physics 1D03 3 dt d p F = Impulse (a vector) is defined as F Δ t (for a constant force), or in general. dt F or (change in p) = (total impulse from external forces) Newton’s Second Law again: Momentum: p = m v
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Physics 1D03 5 Momentum Conservation F 1 F 2 = - F 1 m 1 m 2 Newton’s 3 rd Law: F 2 = - F 1 leads to the Law of Conservation of Momentum: The total momentum ( vector sum) of all the particles in a system remains constant if there are no external forces acting on the system. Physics 1D03 6 Example: roller basketball A (stationary) 100-kg basketball player on roller skates shoots a 1-kg basketball horizontally at a speed of 10 m/s. What happens (if there is no friction)? Is momentum still conserved after an opponent catches the ball and holds it? What happens the ball is thrown upward at an angle of
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lecture26[1] - Collisions Conservation of Momentum Elastic...

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