Circular Motion:

Forces

Centripetal Force

All objects that experience circular motion experience

a centripetal force.

Centrifugal Force

From the object’s frame of reference there is an

outward force. This is the centrifugal force.

Centrifugal Force, pt 2

Force?

No, It is Inertia

Centripetal Acceleration

acvr

ac r

2

2

Centripetal Force

Fc mvr

Fc mr

2

2

r = 0.5 mBall

completes 3 revs in 6 seconds.

What is ac?

What is FC?

Uniform Circular Motion

m = 1.2 kg

Problem #2

A 1500 kg car travels around a circular curve at 35 m/s. The radius of the curve is 150 m. What is the force of friction between the tires and the road required to keep the car from sliding?

If the coefficient of friction is 0.90 what is the minimum radius the car could take without slipping?