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PHY 241
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A ball is tossed vertically upward and caught at the position from which it was released.
• Ignoring air resistance will the ball at the instant it reaches its original position be traveling faster, slower, or at the same speed as it was when released?
answer/question/discussion: ->->->->->->->->->->->-> :
The ball will be moving at the same speed. Same energy going up becoming pe is available coming down to become ke
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• What, if anything, is different in your answer if air resistance is present? Give your best explanation.
answer/question/discussion: ->->->->->->->->->->->-> :
no difference. Air resistance will apply the same throughout.
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1 min
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What is the direction of air resistance as the ball rises?
What is the direction of air resistance as the ball falls?
Does the direction of the gravitational force change?
Does this affect your original answer?
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PHY 241
Your 'cq_1_21.2' report has been received. Scroll down through the document to see any comments I might have inserted, and my final comment at the end.
** **
A typical automobile coasts up a typically paved incline, stops, and coasts back down to the same position.
• When it reaches this position, is it moving faster, slower or at the same speed as when it began? Explain
answer/question/discussion: ->->->->->->->->->->->-> :
It will be moving faster if we take friction between the tires and the ground into account. The friction always opposes motion. On the way up the incline it adds to the accel slowing the car quicker. On the way back down it decreases accel, decreasing the final velocity.
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It would follow that the car doesn't go as far up the incline, and that on the way down it slows more quickly than if friction wasn't present.
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