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# BJU Physical Sci 7

### BJU Physical Science - Ch 7

The distance an effort must be exerted on a simple machine increases inversely in proportion to the effort reduction according to its MA; a consequence of the law of the conservation of energy, which states that work input must equal work output. distance principle
A wheel with teeth on its perimeter that mesh with similar teeth of other gears to do work while producing rotational motion. gear
In its most basic form, a two-dimensional surface whose opposite ends are at two different heights. It forms the basis for wedges, stairways, ramps, and screws. incline plane
A simple machine that can be modeled as a rigid bar that pivots about a fulcrum to exert an effort moment against a resistance moment. lever
A measure of the reduction in effort to do a certain amount of work when using a simple machine. mechanical advantage
The rate of doing work, measured in watts in SI. power
A modified lever consisting of a rope that moves around a grooved wheel; can be movable or fixed. pulley
The condition in which the sum of all the torques on a system is zero—the system will rotate either at a constant speed or not begin to rotate at all; the equivalent to Newton’s first law for linear motion. rotational equilibrium
A basic mechanical device that either reduces effort or increases the magnitude of motion for a given input motion when doing a certain amount of work. simple machines
A modified lever in which the axle is the axis on which a wheel rotates. wheel and axle
The equivalent of the amount of energy transferred to an object when a force acts on the object to move it in a direction parallel to the force vector; a scalar quantity measured in joules (J) in the SI. mechanical work
The point about which a lever pivots or rotates Fulcrum
A twisting action produced by a force exerted perpendicularly to a torque arm. Torque
In a lever system in rotational equilibrium, the effort torque equals the resistance torque Law of torques
Created by: heidio