This is the defining equation for the kinetic energy of a point particle. It states that the kinetic energy of a point particle is one-half times the mass of that particle times the square of the magnitude of its velocity.

**Pitfall Avoidance Note:** Make sure you don't
mistake kinetic energy for the force constant of a spring and
vice versa. Kinetic energy is represented by an upper case *K*.
The force constant for a spring is represented by a lower case *k*.