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Pure translational motion
All points on an object move in parallel paths.
Torque
A turning force causing angular acceleration, calculated as the magnitude of force multiplied by the lever arm.
Lever arm
The distance from the axis of rotation to the line of action of the force.
Rigid body equilibrium
When an object has zero translational and angular acceleration.
Center of gravity
The point where an object's weight effectively acts when calculating torque.
Moment of Inertia
The resistance of an object to changes in its motion, calculated as mass times the square of the distance to the axis of rotation.
Rotational work
Energy transformation due to torque over a distance, leading to a change in rotational kinetic energy.
Rotational kinetic energy
Energy of a rotating object due to its rotation, calculated as half the moment of inertia times the square of the angular velocity.
Angular momentum
The product of an object's moment of inertia and its angular velocity around the same axis.
Principle of Conservation of Angular Momentum
Angular momentum remains constant if the net external torque acting on the system is zero.
Note
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