A4 Vocab & Formulas

Front

Torque

Back

A measure of the force that can cause an object to rotate about an axis.

Front

Angular Displacement, units

Back

θ, measured in radians (rad)

Front

Angular Velocity, units

Back

ω, measured in radians per second (rad/s)

(aka "welocity")

Front

Angular Acceleration, units

Back

α, measured in radians per second squared (rad/s²)

Front

Distance (m) to arc length (θ)

Back

Arc length = radius × angular displacement

s = rθ

Front

Rotational Equilibrium

Back

Occurs when the net torque acting on a system is zero.

Front

Couple

Back

A pair of equal and opposite forces whose effect is to produce rotation without translation. Generates net torque, but zero net force.

Front

Moment of Inertia (I)

Back

A measure of an object's resistance to changes in its rotation, depends on mass distribution.

General formula: I = mr²

Front

Rotational Kinetic Energy

Back

Front

Total Kinetic Energy (formula)

Back