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October 24, 2014

October 24, 2014

Posted by **Anon** on Thursday, January 17, 2008 at 10:32am.

At what rate was the car accelerating as it rolled down the plateau?

- Physics -
**drwls**, Thursday, January 17, 2008 at 12:00pmThis is one of those problems where you have to weed out or ignore the information you don't need.

The component of the weight force along the incline is M g sin 12.4. Opposed to that is the rolling friction, which is M g cos 12.4 * 0.125. Subtract the second number from the first for the net force that causes acceleration. Then divide by the mass M for the acceleration, a. Since mass cancels out,

a = g (sin 12.4 - 0.125 cos 12.4)

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