How Does Friction Affect a Small Block on a Moving Incline?

[countryapple]

Homework Statement

A small block of mass .5kg sits on a large block of mass 5kg as shown. The coefficient of static friction between the blocks is .6, but between the large block and the table there is no friction. What horizontal force will keep the small block from slipping down the incline if the angle is 50 degrees.

Homework Equations

How do I take into account the incline is also moving?

The Attempt at a Solution

I set up a Ff< mew(sum of forces)

I solved for F, but did not get the right answer which should be around 2

 

[rl.bhat]

Hi countryapple, welcome to PF.
The problem is not clear. You have mentioned the table and inclined plane. On which the larger block is moving? To which the horizontal force is applied. If you can provide the figure the problem will be clear.