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Phy 201
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: ->->->->->->->->->->->-> : The ball with less force will have more acceleration. Because a = F/m, two objects with the same force would have a smaller acceleration
for the heavier object and larger acceleration for the lighter object.
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Newton's Third Law ensures that the forces are equal and opposite.
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So your conclusion that the lesser mass will have the greater acceleration is valid.
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If the forces were exerted during identical time intervals, which would have the greater change in speed?
answer/question/discussion: ->->->->->->->->->->->-> : They would both experience the same change in speed. For example, take 10kg and 5kg objects that impact 0.03 seconds. The momentum of the
10kg object is 0.3kg*m/s and that divided by 10kg gives us 0.03m/s^2. The 5kg object 0.15kg*m/s on impact and divided by 5kg is 0.03m/s^2.
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If one object has greater acceleration than another, during the same time interval, then the changes in speed will not be equal.
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15 min
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1:00 pm EST 7/5/14
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