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July 25, 2014

Homework Help: Grade 12 Physics

Posted by solexgirl12 on Monday, October 13, 2008 at 11:32pm.

This question came up on my review package tonight, and it has me stumped.

"A box of mass 14.5kg slides at a constant speed of 4.70m/s down a ramp at 35.3 degrees below the horizontal. What is the force of friction on the box?"

I can calcuate force of friction on accelerating objects, but one moving at a constant speed has me puzzled. Also, my FBD Fgx and Fgy components look a little suspicious. I got:
Fgy=142.1 N
Fgx=79.6 N

Can anyone help clear this up for me?
Thanks so much.

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