Centrifugal force

Definition

Centrifugal force is a fictitious force perceived in a rotating reference frame, directed outward from the axis of rotation. It arises due to the inertia of an object moving in a curved path.

5 Must Know Facts For Your Next Test

1. Centrifugal force does not exist in an inertial frame of reference; it is only observed in rotating reference frames.
2. It is equal in magnitude but opposite in direction to the centripetal force exerted on an object moving in a circular path.
3. $F_c = m \omega^2 r$, where $m$ is mass, $\omega$ is angular velocity, and $r$ is radius.
4. Centrifugal force can be understood as the result of inertia acting against the centripetal acceleration required to change the direction of motion.
5. In practical applications, such as car turns or amusement park rides, centrifugal force explains why objects seem to be pushed outward.

Review Questions

• What distinguishes centrifugal force from centripetal force?
• How is centrifugal force calculated for an object moving at a constant angular velocity?
• Why is centrifugal force considered a fictitious force?

Related terms

Centripetal Force: The real force directed toward the center of a circular path that keeps an object moving along that path.

Angular Velocity: A measure of how quickly an object moves through an angle, usually expressed in radians per second.

Inertial Frame of Reference: A frame of reference in which objects obey Newton's laws of motion and are not subject to fictitious forces.