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Phy 201
Your 'cq_1_24.2' report has been received. Scroll down through the document to see any comments I might have inserted, and my final comment at the end.
** CQ_1_24.2_labelMessages **
A steel ball of mass 60 grams, moving at 80 cm / sec, collides with a stationary marble of mass 20 grams. As a result of the collision the steel ball slows to 50 cm / sec and the marble speeds up to 70 cm / sec.
Is the total momentum of the system after collision the same as the total momentum before?
answer/question/discussion: ->->->->->->->->->->->-> :
Initial momentum:
(.06 kg*.8 m/s)+(.02 kg*0 m/s)=.048 kg*m/s
Final momentum:
(.06 kg*.5 m/s)+(.02 kg*.7 m/s)=(.03 kg*m/s)+(.014 kg*m/s=.044 kg*m/s
The total momentum before is greater than the total momentum after the collision.
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What would the marble velocity have to be in order to exactly conserve momentum, assuming the steel ball's velocities to be accurate?
answer/question/discussion: ->->->->->->->->->->->-> :
.048 kg*m/s-.03 kg m/s=.018 kg*m/s
velocity=.018 kg m/s / .02 kg=.09 m/s
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