Ground reaction forces are mentioned in the golf swing, but what exactly are they? GOLF Top 100 Teacher Mark Blackburn breaks it down in Home Practice.

A force is a push or a pull that acts on an object. There are many kinds of force. Find out more with BBC Bitesize. For students between the ages of 11 and 14.

An action generates an equal and opposite reaction. If it were possible, however, for one of the two bodies to have negative mass, they would accelerate each other. A situation analogous to this ...