51�Թ�

The force of friction on his feet would be twice the bite force of a large American alligator, so I don’t think his toes would take it too well.

To calculate the force of friction, one must multiply the coefficient of friction by the force generated by the object, which was the mass of the tub in the pull of gravity.

The answer to that question reveals a surprising aspect of high-speed skiing that should interest Olympic spectators: Once you get past 40 mph or so -- near the top end for recreational skiers -- air friction is the single largest force acting against you, greater than the force of friction between the skis and the snow.

When I undertake to pick out of the pile of rubbish some picture that must have been originally worth a great deal of money, I find it so disfigured by the sheer force of friction that it looks no better than an old daub.

He was a nervous, bustling man, with an expression of acuteness, and a trick of rubbing his head with a circular motion, as if he were trying to effect a tonsure by force of friction.