Any of the elementary forms or parts of machines: three primary (the lever, inclined plane, and pulley) and three secondary (the wheel-and-axle, wedge, and screw).
A measure of the effectiveness that a force producing a physical effect has over time. If linear, the quotient of: (force multiplied by the displacement of or in an object) ÷ time. If rotational, the quotient of: (force multiplied by the angle of displacement) ÷ time.
A product of equal factors (and generalizations of this notion): x^n, read as "x to the power of n" or the like, is called a power and denotes the product x \times x \times \cdots \times x, where x appears n times in the product; x is called the base and n the exponent.