Sections

Key Terms
# Key Terms

- angle of rotation
- the ratio of the arc length to the radius of curvature of a circular path

- angular acceleration
- the rate of change of angular velocity with time

- angular velocity
- ($\omega $) the rate of change in the angular position of an object following a circular path

- arc length
- ($\text{\Delta}s$) the distance traveled by an object along a circular path

- centrifugal force
- a fictitious force that acts in the direction opposite the centripetal acceleration

- centripetal acceleration
- the acceleration of an object moving in a circle, directed toward the center of the circle

- centripetal force
- any force causing uniform circular motion

- circular motion
- the motion of an object along a circular path

- kinematics of rotational motion
- the relationships between rotation angle, angular velocity, angular acceleration, and time

- lever arm
- the distance between the point of rotation (pivot point) and the location where force is applied

- radius of curvature
- the distance between the center of a circular path and the path

- rotational motion
- the circular motion of an object about an axis of rotation

- spin
- rotation about an axis that goes through the center of mass of the object

- tangential acceleration
- the acceleration in a direction tangent to the circular path of motion and in the same direction or opposite direction as the tangential velocity

- tangential velocity
- the instantaneous linear velocity of an object in circular or rotational motion

- torque
- the effectiveness of a force to change the rotational speed of an object

- uniform circular motion
- the motion of an object in a circular path at constant speed