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December 22, 2014

Homework Help: Physics

Posted by Jeanne on Monday, October 10, 2011 at 11:28am.

A box with a mass of 7.00 kg is at rest on a ramp that is at an angle of 20 degrees with the horizontal. The coefficient of static friction between the box and the ramp is 0.800. Use g = 9.80 m/s2. You now want to make the box move by applying a force. To start the box moving, what is the minimum force you need to apply if your force is directed ...

(a) parallel to the slope?
.N

(b) perpendicular to the slope?
.N

(c) horizontally?

N

I know that (a) is The static friction in the x direction minus the box sliding down in the x direction, but I cannot wrap my head around the other two.

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