# Homework Help: WEDGE and block

1. Aug 10, 2013

### hav0c

1. The problem statement, all variables and given/known data

A block A of mass m is placed over a wedge B of same mass m. Assuming all surface to be smooth. The displacement of block A is 1 sec if the system is released from rest is :

2. Relevant equations

3. The attempt at a solution
i have made fbds and have the relations-
1. ma1=(g-N1)/m
2.N1cos θ+mg cosθ=N2
3.ma2=sinθ(mg+N1)
now im stuck

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2. Aug 10, 2013

### consciousness

There is one more equation. The blocks stay in contact so their velocities perpendicular to the contact are same. What can you say about the relative acceleration perpendicular to the contact?

3. Aug 10, 2013

### hav0c

What velocities are the same?
I dont get it
EDIT:Thanks i got it A1=a2sintheta

Last edited: Aug 10, 2013
4. Aug 10, 2013

### Saitama

Your first equation has a dimensional error.

I don't think the second equation would do any good. Your third equation is fine. Apply the constraint that blocks A and B stay together during the motion.