Chapter Twelve

the fixed point around which a lever pivots

a simple machine consisting of a grooved wheel around which is wrapped a rope, chain, or cable

a simple machine consisting of a rigid object that pivots about a fixed point

the mechanical advantage that a machine provides in a real situation

the product of force and distance when a force is used to move an object

two or more wheels linked together by interlocking teeth

a simple machine that consists of an inclined plane wrapped around a central cylinder to form a spiral

a unit of work equal to one newton-meter

a device that combines two or more simple machines

a simple machine consisting of two circular or cylindrical objects that are fastened together and rotate around a common axis

the mechanical advantage that a machine would have without friction

the force exerted on an object by a machine

a simple machine consisting of a device that is thick at one end and tapers to a thin edge at the other.

a device that changes the amount of force exerted or the direction in which the force is exerted

a simple machine consisting of a flat surface with one end higher than the other

the percentage of the input work that is converted to work output

The number of times the force exerted on a machine is multiplied by the machine

the force exerted on a machine

a band of connective tissue that attaches a muscle to a bone