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item 152
Author: SO HING NAM I want to point out that ball B will act as a horizontal projectile after passing the dip. If so, the situation is a bit complicated and thus we can't make any conclusion.
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Re: item 152
Author: Bruce, ComPADRE Dir There is an approximation assumed here that the ball stays on the track, or if it leaves the track it is for a very short period of time. If the ball is rolling fairly slowly this is quite reasonable. Try it. We're also approximating that this process conserves energy.
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Re: item 152
Author: SO HING NAM First of all, Thanks for your reply. You have tried your best to explain. But your arguement about the velocity in x-direction for the whole process of ball B after projected horizontally and make collision with the slope, Do you think the collision is elastic? How many times will ball B bounce back from the slope. If it is uncertain, the situation will be too complicated and no conclusion can be made.
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Item 152
Author: SO HING NAM Obviously, The x component of the initial velocity of the ball B is smaller than ball A. Although it has an acceleration in x direction, it needs time to speed up. Hence, we can't conclude that the average velocity in x direction is higher for ball B.
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Re: Item 152
Author: Bruce, ComPADRE Dir Why would the initial velocity of ball B in the x-direction be smaller? Both A and B start at the same height, so on the horizontal part of the track, they will both have the same velocity (in the x-direction). Once the ball on track B hits the dip, it will accelerate in both x and y.
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Re: Re: Item 152
Author: SO HING NAM I want to make sure that by energy conservation, when ball B slide down the slope, its initial speed is the same as ball A. However, its direction is along the slope. So the component of initial velocity in x dirction will be smaller than ball A. Is this right? Please reply. Thanks.
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Re: Re: Re: Item 152
Author: SO HING NAM In addition, is track B smooth enough to allow Ball B slide on the track? That means there isn't any flying motion for ball B after hitting the dip.
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Re: Re: Re: Re: Item 152
Author: Bruce, ComPADRE Dir > On Sep 14, 2009, SO HING NAM posted:
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Re: Re: Re: Item 152
Author: Bruce, ComPADRE Dir > On Sep 14, 2009, SO HING NAM posted:
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<a href="https://www.compadre.org/portal/items/detail.cfm?ID=4008">National Science Foundation. Assessing-to-Learn Questions Database. Amherst: UMass Physics Education Research Group, June 30, 2007.</a>
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(UMass Physics Education Research Group, Amherst, 1995), WWW Document, (http://clickercentral.net/).
AJP/PRST-PER
Assessing-to-Learn Questions Database (UMass Physics Education Research Group, Amherst, 1995), <http://clickercentral.net/>.
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Assessing-to-Learn Questions Database. (2007, June 30). Retrieved May 10, 2024, from UMass Physics Education Research Group: http://clickercentral.net/
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National Science Foundation. Assessing-to-Learn Questions Database. Amherst: UMass Physics Education Research Group, June 30, 2007. http://clickercentral.net/ (accessed 10 May 2024).
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Assessing-to-Learn Questions Database. Amherst: UMass Physics Education Research Group, 1995. 30 June 2007. National Science Foundation. 10 May 2024 <http://clickercentral.net/>.
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@misc{
Title = {Assessing-to-Learn Questions Database},
Publisher = {UMass Physics Education Research Group},
Volume = {2024},
Number = {10 May 2024},
Month = {June 30, 2007},
Year = {1995}
}
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%T Assessing-to-Learn Questions Database %D June 30, 2007 %I UMass Physics Education Research Group %C Amherst %U http://clickercentral.net/ %O text/html
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