Changes

'''Kinetic energy''' represents the [[energy]] asociated with the [[motion]] of an object.<ref>Serway and Beichner, ''Physics for Scientists and Engineers'', Fifth Edition</ref> It is defined as:

'''Kinetic energy''' represents the [[energy]] associated with the [[motion]] of an object.<ref>Serway and Beichner, ''Physics for Scientists and Engineers'', Fifth Edition</ref> It is defined as:

K ≡ [[mass|m]][[velocity|v]]² / 2 for a point mass and <math> K = {1 \over 2}mV^2 + {1 \over 2} I \omega ^2 </math> for a body, where I is the body's moment of inertia and omega is the body's angular velocity.

K ≡ [[mass|m]][[velocity|v]]² / 2 for a point mass and <math> K = {1 \over 2}mV^2 + {1 \over 2} I \omega ^2 </math> for a rigid body, where I is the body's moment of inertia and omega is the body's angular velocity.

The change of kinetic energy in an object is equal to the total [[work]] done on it by a [[force]]. In the case of constant force, this can be expressed as:

The change of kinetic energy is equal to the total [[work]] done on it by the resultant of all [[force|forces]] acting on it. For a point mass this can be expressed as:

Σ''W'' = ΔK = mv_f² / 2 - mv_i² / 2

Σ''W'' = ΔK = mv_f² / 2 - mv_i² / 2