- #1

Kruger

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A block is accelerated with

I have to determine

The relevant equations are basically Newton's equations.

What I have done so far is the following: One force acting on the block is coming from the gravitational field, so F_g=m1*g. I have splitted this one in components: F||=sin(alpha)*F_g and (already added friction) F_s=cos(alpha)*F_g*(1-u1).

I don't know how I can go on. The basic problem is I don't really know how

**a**, take a look at the picture. There is a friction between the red block and the other one with mass**m1**. The friction is given by the coefficient**u1**.I have to determine

**a**such that the blue block is not moving relative to the red one.**a**has to bi in depenence of angle**alpha**.## Homework Equations

The relevant equations are basically Newton's equations.

## The Attempt at a Solution

What I have done so far is the following: One force acting on the block is coming from the gravitational field, so F_g=m1*g. I have splitted this one in components: F||=sin(alpha)*F_g and (already added friction) F_s=cos(alpha)*F_g*(1-u1).

I don't know how I can go on. The basic problem is I don't really know how

**a**acts one the block. And how I've to balance the forces.