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BJU Physical Sci 7
BJU Physical Science - Ch 7
| Question | Answer |
|---|---|
| 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:
marchscience
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