An important point about 5C
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class follow up,
Mr. Burk
A very important point came up today when a few students were discussing 5c. The question was which of the following two graphs is the right answer. It turns out the bottom graph is right. Why?
Wednesday, January 20, 2010
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2 comments:
Well I think the second graph makes more sense because, where the two lines intersect, the height is at the middle point of throwing the ball up. Like, the at the end or the right side of the graph is the point where the ball is up in the air at it's maximum height. Simply thought, the ball when thrown upwards, would go through the whole motion of the bottom graph, but then going down, would go backwards across the graph.
The reason why the one on top is wrong is because it would suggest that the ball is thrown up in the air, then reaches its so called 'maximum height' stops for a milisecond, then continues upward at an acceleration = to Gravity. We can find that by the height axis in the graph. If height was increasing from left to right. then at the maximum height KE would be maximum and Gravitational Potentional Energy would be minimum which we know to be false.
Nice work.
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