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phy121
Your 'cq_1_17.1' report has been received. Scroll down through the document to see any comments I might have inserted, and my final comment at the end.
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A steel ball rolls down a ramp and collides with a marble, as in the video. The marble is slightly smaller and quite a bit less massive than the ball.
• If they both experience forces of the same magnitude (in this case, equal and opposite forces), which will have an acceleration of the greater magnitude?
answer/question/discussion: ->->->->->->->->->->->-> :
if they have the same force we can make some numbers up to show which ball would have a greater acceleration. If the force was 200N and the larger ball was 50kg and the smaller was 25kg, therefore:
Big: F= m*a =200N/50kg a=4m/s^2
Small: a= 200N/25kg= 8m/s^2
Therefore, the small ball would have greater acceleration.
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• If the forces were exerted during identical time intervals, which would have the greater change in speed?
answer/question/discussion: ->->->->->->->->->->->-> :
using the same numbers as above, and having the same time of 10s/
A= ‘dv/’dt
Big: ‘dv= 4m/s^2*10s= 40m/s
Small: ‘dv= 8m/s^2*10s= 80m/s
Therefore, the smaller ball would have a greater speed.
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You can't determine the speeds of the balls from this analysis. You can find only the change in speed.
It is true that the less massive ball, which experiences a force of the same magnitude as the more massive ball, will have the greater change in speed.
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&#Good responses. See my notes and let me know if you have questions. &#