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Old Jan 4th 2009, 11:56 AM   #1
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Friction problem

Someone slides down a ramp at 55 degrees. The coefficent of friction is 0.15. The mass of the person is 35 kg. If he starts from rest at the top, how long does it take for him to get to the bottom of the 10.0 m ramp?

Could someone help me please?
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Old Jan 7th 2009, 06:17 PM   #2
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$\displaystyle *ma_x = -mgsin(\theta) + f = -mgsin(\theta) + \mu N $
$\displaystyle ma_y = N - mgcos(\theta) = 0 $
From that
$\displaystyle ma_x = -mgsin(\theta) + \mu mgcos(\theta) $
$\displaystyle a_x = g(\mu gcos(\theta)-sin(\theta)) $
Now you should know
$\displaystyle \Delta s = \frac{at^2}{2} $
Solve for t
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Old Jan 8th 2009, 03:28 AM   #3
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physics help tutorials

dear i want to say only one thing regarding urgent physics tutorials to go through to various e learning of physics programs in internet, where you can increase your physics skills.
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