# Homework Help: Phyiscs- forces. and friction

1. Dec 15, 2008

### kimberly

1. The problem statement, all variables and given/known data
3. A 3.0 kg block starts from rest at the top of a 30 degree incline and accelerates uniformly down the incline, moving 2.0 m in 1.5s.
a. find the magnitude of the acceleration of the block
b. find the coefficient of kinetic friction between the block and the incline
c. find the magnitude of the frictional force acting on the block.
d. Find the speed of the block after it has slid a distance of 2.0 m.

2. Relevant equations

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3. The attempt at a solution
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2. Dec 15, 2008

### Dr.D

You are pretty short on relevant equations and an attempt at a solution. Why don't you try to come up with something before you ask for help, please.

3. Dec 15, 2008

### LowlyPion

Welcome to PF.

What forces do you think are acting on the block?

There's always gravity. So how does it act on the block in moving it down the incline?

If it was frictionless what acceleration would it experience at that angle of incline? Armed with that and the acceleration they give you then maybe the friction effect could be identified?