Torque and Rotational Motion Glossary
12 essential terms — because precise language is the foundation of clear thinking in Torque and Rotational Motion.
Showing 12 of 12 terms
Rate of change of angular velocity. alpha = d(omega)/dt. Unit: rad/s^2.
L = I*omega for a rigid body. Conserved when net external torque is zero. Rotational analog of linear momentum.
Rate of change of angular position. omega = d(theta)/dt. Unit: rad/s.
The perpendicular distance from the axis of rotation to the line of action of the force. Determines torque magnitude.
Rotational equivalent of mass. I = sum(m*r^2). Resistance to angular acceleration. Depends on mass distribution.
I = I_cm + Md^2. Relates moment of inertia about any axis to that about a parallel axis through the center of mass.
A method for determining the direction of angular velocity, torque, or angular momentum vectors in rotational motion.
v = R*omega. The contact point is instantaneously at rest. No kinetic friction; static friction enables rolling.
Another name for moment of inertia. An object's tendency to resist changes in its rotational state of motion.
KE_rot = (1/2)*I*omega^2. Energy due to rotation about an axis.
Net force = 0 and net torque = 0. Object has no translational or rotational acceleration.
The rotational equivalent of force. tau = r x F. Causes angular acceleration. Unit: N*m.