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.

Grade 12 Physics - drwls, Tuesday, October 14, 2008 at 12:55am
If there is no acceleration, the component of weight down the ramp, M g sin 35.3, equals the friction force.

The speed does not matter in the calculation.

I do't see how you got your Fgy and Fgx umbers.
- Grade 12 Physics - solexgirl12, Tuesday, October 14, 2008 at 2:20am
  Yeah, me either. *sigh* Thanks very much.

Answer this Question

Related Questions

physics - two packages at ups start sliding down the 20 degrees ramp. package a ...
physics - In the following diagram, the hanging mass is 3.5kg, and the box has a...
Physics - There is a 5kg box sitting on top of a 10kg box. The static friction ...
Physics - A 6.7 kg package starts from rest and slides down a mail chute that is...
Physics - A box which has a mass of 14kg is sliding along a horizontal surface ...
MATH help - A box with no top is to be constructed from a piece of cardboard ...
Physics 12 - This came up on our test review for tomorrow, and I'm stumped...
physics - a 35.5kg box slides down an incline plane with a 25 degree angle at a ...
physics - An 8.00kg package in a mail-sorting room slides 2.00 m down a chute ...
physics - A 5.20 package slides 1.57 down a long ramp that is inclined at 13.0 ...

For Further Reading

First Name:
School Subject:
Answer: