# Does Centripetal force cause a tangential force?

1. Feb 19, 2012

### Kalus

If I have a string with a lump on the end and is being swung in a circle with a continuous angular velocity then I know that:

$$F= m\frac{v^2}{r}$$

or using angular velocity,

$$F= m r \omega^2$$

But, is there a tangential force acting at the point of mass in its instantaneous direction, and if so, what is it equal to?

Last edited: Feb 19, 2012
2. Feb 19, 2012

### tiny-tim

Hi Kalus!

("/tex" not "\tex" )

There's a tangential force only if there's a tangential acceleration (Newton's second law).

If the angular speed is constant, there isn't.