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10_29_2D_Momentum

# 10_29_2D_Momentum - 10/29 Momentum Examples 0 0 0 0 Text...

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10/29 Momentum Examples 0 Text: Chapter7 (and 6 for Energy) 0 Presentation “Hockey Puck in 2-D” 0 Upcoming presenters please see me 0 HW Text 7-39 Due Thursday 11/1 Hint: 2 Equations (Momentum and Energy) 0 Suggested Problems: 7-11,20,22,32,36 0 Lab: 2-D Collisions

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Two identical hockey pucks slide on a frictionless surface at the same speed but in different directions . Forces, identical in direction and magnitude, act on the pucks for the same amount of time. v i v i F F Is the momentum conserved? No, there is an external force and an impulse. p = ? How do the change in momenta compare? Same size and direction!!! Let’s say = p How do the final velocities compare? Sketch the trajectory of the lower puck. Which one crosses the dotted line first? What’s next? Momentum diagram, arrows p 1,i p 2,i = p = p p 2,f p 1,f p 1,f > p 2,f v 1,f > v 2,f p = mv m 1 = m 2 = F t
Two identical hockey pucks slide on a frictionless surface at the same speed but in different directions . Forces, identical in direction and magnitude, act on the pucks for the same amount of time. v i v i F F Sketch the trajectory of the lower puck. Which one crosses the dotted line first? p 1,i p 2,i = p = p p 2,f p 1,f p 1,f > p 2,f v 1,f > v 2,f m 1 = m 2 v ave = x/ t considering only the horizontal direction How do the v’s compare for the two pucks? p = m v v’s are the same v 1,aveX v 2,aveX

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Two identical hockey pucks slide on a frictionless surface at the same
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10_29_2D_Momentum - 10/29 Momentum Examples 0 0 0 0 Text...

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