# Mass not sliding on a smooth, accelerating base

1. Jul 5, 2015

### Karol

1. The problem statement, all variables and given/known data
Mass m lays on the smooth triangle of mass M. what is the acceleration of M so that m will stay in place.

2. Relevant equations
Newton's second law: $F=ma$

3. The attempt at a solution
$$\tan\alpha=\frac{ma}{mg}\;\rightarrow\; a=g\tan\alpha$$

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2. Jul 5, 2015

### rpthomps

My suggestion is to determine the acceleration of the block if the ramp is not moving first, down the slope.

3. Jul 5, 2015