Physics within curling...
M1V1 + M2V2 = M1V1 + M2V2
(Before Collision) (After Collision)
This formula expresses the law of conservation of momentum. Momentum is basically the mass of an object multiplied by its velocity. The formula means that momentum cannot be created nor destroyed, so that when two rocks collide the momentum is transferred from one rock to the other. The initial rock has a mass and velocity, which makes up its kinetic energy. This kinetic energy is trasnferred when the rock comes in contact with the other rock. This is the law of conservation of energy.