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Planar Mechanics

  • Thread starter looseliver
  • Start date
  • #1

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?

Homework Equations



angular velocity 8k rad/s
angular acceleration -10k rad/s2
Radius 0.5m

The Attempt at a Solution


Homework Statement





Homework Equations





The Attempt at a Solution

 

Answers and Replies

  • #2
radou
Homework Helper
3,115
6
What you wrote under "Relevant equations" actually belongs into the "Homework Statement " part. So, what are the relevant equations?
 
  • #3
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.
 
  • #4
radou
Homework Helper
3,115
6
You got the first relation right, but not the second one. The acceleration of the point equals angular acceleration times the radius.
 

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