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Information about this web site => Question related to Physics or physics related simulation => Topic started by: Stuckonphysics on October 05, 2011, 11:31:27 pm



Title: I'm soooooo lost on this one problem my teacher gave me; Forces on an Incline
Post by: Stuckonphysics on October 05, 2011, 11:31:27 pm
I really need to know HOW to do this problem... and why...

He gave us an incline that is 30˚ with a box on top of the incline. When the Ms =0.5 and Mk = 0.3.
What happens?
-Does it move?
-If so, what's the acceleration?

So far :
I have drawn a force diagram that shows f to the left of the box, mg down from the box, and N (normal force) up from the box...
 
Then,
Fxnet=max and fynet=may

So,
-fk=max and N-mg=may

is any of this right?... and if not... can someone PLEASE HELP.


Title: Re: I'm soooooo lost on this one problem my teacher gave me; Forces on an Incline
Post by: Fu-Kwun Hwang on October 06, 2011, 03:19:11 pm
What are the meaning of Ms and Mk? Are they coefficient for static friction and kinetic friction?

You can calculate the component of gravitation force (mg) along the incline direction ($m\,g\,\sin\theta$)
and normal direction (m g ??? this is for your!) ,and find out the friction force.

Try to write down whatever you know and we will try to help you!