It has been shown that by the use of tools and machines which are all based on one of the six principles just described, it is possible to apply a small force to overcome a large resistance. This advantage is obtained by sacrificing either speed to gain force or force to gain speed. The ratio of the resisting force to the applied force is called the mechanical advantage of the tool or machine. The advantage gained in all the simple machines is lost in time. No machine will enable a given amount of force to raise 2 lbs. with the same velocity as it can raise 1 lb. As a matter of fact, power is wasted by the use of machinery because the increase of friction adds to the amount of force which has to be used.