# A model train with a mass of 1 kg is moving along a track at 24 (cm)/s. If the curvature of the track changes from a radius of 96 cm to 180 cm, by how much must the centripetal force applied by the tracks change?

$\frac{F 1}{F 2} = \frac{r 2}{r 1}$
$F 1 = \frac{96}{180} F 2$
$F = \frac{m {v}^{2}}{r}$