# Planar Mechanics

looseliver

## Homework Statement

How do i calculate the velocity and accaleration of a point on a moving disk when i know the angular velocity , angular acceleration and radius of the disk?

## The Attempt at a Solution

Homework Helper
What you wrote under "Relevant equations" actually belongs into the "Homework Statement " part. So, what are the relevant equations?

looseliver
Sorry about that. this is my first post.

The relevent equations is what i am unsure about...
I am considering using:
v=wr
Velocity = angular velocity x Radius

and:
a=xr
Acceleration = angular velocity x Radius.

I'm not certain if these are the correct equations to use. Just seems a bit straight forward.

Homework Helper
You got the first relation right, but not the second one. The acceleration of the point equals angular acceleration times the radius.