Smooth ice reduces the unbalanced forces that would slow the hockey puck.
Force is a measure of the interaction between bodies, mass is a measure of the amount of material in an object, weight is the gravitational force acting on a body (although for trading purposes it is taken to mean the same as mass) and load usually means the force exerted on a surface or body
Makes a fluent noice that goes on and echos for a bit
I believe that would be speed. Velocity on the other hand would indicate speed AND direction