# Centripetal Acceleration

1. Apr 1, 2006

### dontcare

A roller-caster vechicle has a mass of 500 kg when fully loaded with passengers (Fig p7.28) (a) If the vechile has a speed of 20.0 m/s at point A, what is the force of the track on the vehicle at this point? (b) What is the maximum speed the vehicle can have at point B in order for gravity to hold it on the track?

a) $$a_{c} = \frac{v^2}{r} = 40 m/s^2$$

2. Apr 1, 2006

### nrqed

Draw a free body diagram. Identify all the forces. The acceleration will be toward the center of the circle (where is the object here? I am assuming that its at the very top of a loop? In that case you would have $a_y = - v^2/R$). Then apply Newtons second law.