P221_2008_week8

# P221_2008_week8 - Figure 9.8,9 Impulse 5.0 m/s 3.0 m/s Two...

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Figure 9.8,9 Impulse

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Two balls of equal mass (m=0.15 kg) … Eventually the two balls collide, and after the collision the red ball is moving at 5.0 m/s and the blue ball is moving at 3.0 m/s. What was the change in momentum of the blue ball? What was the change in momentum of the red ball? Was momentum conserved in this collision? (most got this 14 right, 5 ok but signs reversed; 9 had various problems with units etc. 18 no answer) The change in momentum for the blue and the red ball are both 2.0 m/s. The momentum is conserved. For collisions of bodies of equal mass, the 2 balls simply exchange velocities. p=mv. p(red)=3x.15kg=.45 p(blue)=5x.15=.75 For the blue ball: p'=m(v2-v1) = 0.15kg*(3.0 m/s - 5.0 m/s) = -0.3kgm/s For the red ball: p''=m(v2- v1) = 0.15kg*(5.0 m/s - 3.0 m/s) = 0.3kgm/s 3.0 m/s 5.0 m/s
Under what circumstances (if any) will linear momentum NOT be conserved in a physical process? (19 correct, 8 off slightly; 18 no answer) if the collision is inelastic, linear momentum is mot conserved in the process.

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P221_2008_week8 - Figure 9.8,9 Impulse 5.0 m/s 3.0 m/s Two...

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