kinetic energy
. For a rigid body rotating about a fixed axis with angular speed ω, and with moment of inertia I about the fixed axis, 
. For a rigid body in general motion, the kinetic energy is given by
where m is the mass of the body, vG is the velocity of the centre of mass G, ω is the angular velocity, and IG is the inertia matrix at G.
Kinetic energy has the dimensions ML2 T−2, and the SI unit of measurement is the joule.
- repeated root
- repeating decimal
- repelling fixed point
- repetition codes
- replicable
- representation
- representation
- representative
- representative sample
- residual
- residual variation
- residue
- residue class
- resistant statistic
- resistive force
- resolution
- resonance
- response bias
- response variable
- rest frame
- rest mass
- restriction
- resultant
- retardation
- retraction