BJU Physical Science - Ch 7
Quiz yourself by thinking what should be in
each of the black spaces below before clicking
on it to display the answer.
Help!
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| 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
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| A wheel with teeth on its perimeter that mesh with similar teeth of other gears to do work while producing rotational motion. | gear
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| 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
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| 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
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| A measure of the reduction in effort to do a certain amount of work when using a simple machine. | mechanical advantage
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| The rate of doing work, measured in watts in SI. | power
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| A modified lever consisting of a rope that moves around a grooved wheel; can be movable or fixed. | pulley
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| 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
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| 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
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| A modified lever in which the axle is the axis on which a wheel rotates. | wheel and axle
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| 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
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| The point about which a lever pivots or rotates | Fulcrum
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| A twisting action produced by a force exerted perpendicularly to a torque arm. | Torque
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| In a lever system in rotational equilibrium, the effort torque equals the resistance torque | Law of torques
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Review the information in the table. When you are ready to quiz yourself you can hide individual columns or the entire table. Then you can click on the empty cells to reveal the answer. Try to recall what will be displayed before clicking the empty cell.
To hide a column, click on the column name.
To hide the entire table, click on the "Hide All" button.
You may also shuffle the rows of the table by clicking on the "Shuffle" button.
Or sort by any of the columns using the down arrow next to any column heading.
If you know all the data on any row, you can temporarily remove it by tapping the trash can to the right of the row.
To hide a column, click on the column name.
To hide the entire table, click on the "Hide All" button.
You may also shuffle the rows of the table by clicking on the "Shuffle" button.
Or sort by any of the columns using the down arrow next to any column heading.
If you know all the data on any row, you can temporarily remove it by tapping the trash can to the right of the row.
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Created by:
marchscience
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