We have already described its momentum as

p = m **v**

Now we can describe its Kinetic Energy as

KE = (^{1}/_{2}) m v^{2}

Momentum, p = m v, and Kinetic Energy, KE = (^{1}/_{2}) m v^{2}, both describe the motion of an object. Both depend upon the object's mass and speed. However, Momentum and Kinetic Energy are not the same thing.Momentum is a

vector. The total momentum of a system could be zero even tho' individual parts have momentum.Kinetic Energy is a

scalar. Nothing "cancels it out". Energy can be changed from one form to another (including heat!).

(C) 2003, Doug Davis; all rights reserved