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| a manifestation of energy; the transfer of energy from one physical system to another expressed as the product of a force and the distance through which it moves a body in the direction of that force. |
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| the influence that produces a change in a physical quantity. |
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| A load is something, usually a large quantity or heavy object, which is being carried. |
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| the amount of space between two places or things. |
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| the ability of matter or radiation to work because of its mass, movement, electric charge, etc. |
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| a simple device for altering the magnitude or direction of a force. |
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| simple machine 简单机械[image] |
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| any of the basic mechanical devices for applying a force, such as an inclined plane, wedge, or lever. |
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| A simple machine consisting of a rigid bar pivoted on a fixed point and used to transmit force. |
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| The point or support on which a lever pivots. |
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| A simple machine consisting of an axle to which a wheel is fastened so that torque applied to the wheel winds a rope or chain onto the axle, yielding a mechanical advantage equal to the ratio of the diameter of the wheel to that of the axle. |
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| A simple machine consisting essentially of a wheel with a grooved rim in which a pulled rope or chain can run to change the direction of the pull and thereby lift a load. |
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| a device used for fastening materials together, consisting of a threaded and usually tapered shank that has a slotted head by which it may be rotated so as to cut its own thread as it bores through the material |
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| A piece of material, such as metal or wood, thick at one edge and tapered to a thin edge at the other for insertion in a narrow crevice, used for splitting, tightening, securing, or levering. |
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| A plane set at an angle to the horizontal, especially a simple machine used to raise or lower a load by rolling or sliding. |
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