# The Naked Scientists Forum

### Author Topic: Circular motion question  (Read 2441 times)

#### Garabato

• Jr. Member
• Posts: 17
##### Circular motion question
« on: 14/09/2007 17:52:24 »
Hi. I would like to know if someone could help me out in this pre-lab homework.

Is only about theoretical x vs y graphics correlating frequency with radius, mass and centripetal force.

I have thhis equation, Im not sure if there are others that should be used, tough.

Cf=4(pi)^2mr(f)^2

For the graphic f vs Cf Do I take in count radius and mass constant? Or do I just need another equation? Could you give it please?

For the graphic f vs r Do I take in count centripetal force and mass constant? Or is it with other equation?

For the f vs m graphic. Do I take in count radius and centripetal constant?

Thank you a lot.

#### lyner

• Guest
##### Circular motion question
« Reply #1 on: 15/09/2007 15:23:11 »
Your formula is ok ( central force = m .r .omega^2 where omega is angular frequency)

You can plot what you like against what you like.
Normally, when graphing something, you keep all but one of the input variables constant - it gives a  more sensible picture of the relationships involved.
so, for example-
keeping the angular frequency constant, the force would be proportional to the radius (straight line)
or
keeping the radius constant, the force would be proportional to the angular velocity squared (parabola)
If this is homework, to be handed in, don't forget to label the axes and write the formula in your title -  be a good student!!

#### The Naked Scientists Forum

##### Circular motion question
« Reply #1 on: 15/09/2007 15:23:11 »