Static and Dynamic Equilibrium EX 2

From pwiki
Revision as of 00:36, 18 June 2011 by imported>Patrick
(diff) ← Older revision | Latest revision (diff) | Newer revision → (diff)
Jump to navigation Jump to search

There are four forces acting on this block: , , , . The block slides up the incline and therefore the force of friction points down the incline (because friction opposes the slide between the two surfaces).

TOP

We select the x-axis parallel to the incline and then draw the free body diagram.

TOP

The components of the forces exerted on the mass kg are:

Forces x-component y-component
50 cos(-127°) = -30 N 50 sin(-127°) = -40 N
0
0
40 cos(-37°) = 32 N 40 sin(-37°) = -24 N


Note that we used in our computations.

First we have to deal with the y-component.

Writing

we see that N.

Now, looking at the x-component, we write

solving for we find N.