# Homework help- centripetal force

1. Feb 8, 2004

### MYS9

If there is a car with a mass of 1200 kg and the radius of the curvature is 25m, and the speed is 43km/h, what is the acceleration?

How do I find the acceleration

At what speed would the centripetal force equal the force of gravity? ( I got 15.7 m/s but I'm not sure if this is right)
If the car was going faster than the speed calculated above, what would happen to the car?

Thanks!

2. Feb 8, 2004

### ShawnD

If the car is going at a constant speed on a round track with a given radius, the acceleration is

$$a = \frac{V^2}{r}$$

v is instantaneous velocity (speed) and r is radius.

I got the same velocity as you (15.66 m/s)