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25 Cards in this Set
- Front
- Back
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work |
Force exerted on an object that causes it to move. |
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Joule |
The amount of work you do when you exert a force of 1 newton to move an object a distance of 1 meter. |
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Power |
The rate a which one form of energy is transformed into another. |
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Watt |
The unit of power when one joule of work is done in one second. |
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Machine |
A device that changes the amount of force exerted, the distance over which a force is exerted, or the direction in which force is exerted. |
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Force |
A push or pull exerted on an object. |
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Input force |
The force exerted on a machine. |
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Output force |
The force exerted on an object by a machine. |
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Mechanical advantage |
The number of times a machine increases a force exerted on it. |
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Efficiency |
The percentage of input work that is converted to output work. |
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Simple machine |
The most basic device for making work easier, these are the smaller building blocks for complex machines. |
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Inclined plane |
A simple machine that is a flat, sloped surface. |
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Wedge |
A simple machine that is an inclined plane that moves. |
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Screw |
A simple machine that is an inclined plane wrapped around a central cylinder to form a spiral. |
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Lever |
A simple machine that consists of a rigid bar that pivots about a fixed point. |
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Fulcrum |
The fixed point around which a lever pivots. |
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Pulley |
A simple machine that consists of a grooved wheel with a rope or cable wrapped around it. |
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Wheel and axle |
A simple machine that consists of two attached circular or cylindrical objects that rotate about a common axis, each one with different radius. |
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Compound machine |
A device that combines two or more simple machines |
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Potential energy |
The energy that an object has because of its position;also the internal stored energy of an object, such as energy stored in chemical bonds. |
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Kinetic energy |
Energy that an object has due to its motion |
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Resistance force |
The force which an effort force must overcome in order to do work on an object via a simple machine. Resistance force, like most other forces, is measured in newtons or in pounds-force. |
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Work Input |
Work done on a machine equal to the effort force times the distance through which the force is applied. |
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Work Output |
Work output is work that is done by a machine equals resistance force times the distance through which the force is applied. |
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Gear |
One of a set of toothed wheels that work together to alter the relation between the speed of a driving mechanism (such as the engine of a vehicle or the crank of a bicycle) and the speed of the driven parts (the wheels). |
