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24 Cards in this Set
- Front
- Back
Work |
Occurs when a force exerted on an object causes that object to move some distance;work = force x distance |
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Potential |
Stored energy in an object due to its position. |
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Kinetic energy: |
Energy an object has due to its motion. |
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Joules |
Units of measurement for work. |
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Power |
The rate at which work is done. |
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Watts |
Units of measurement for power. |
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Work input |
The work done by someone on a simple or compound machine. |
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Work output |
The work produced by a simple or compound machine. |
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Force |
A push or a pull; causes an acceleration |
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Effort force |
A force applied to an object. |
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Resistance force |
The force in which the effort force must overcome in order to do work. |
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Efficiency |
Useful work per quantity of energy; efficiency = [output work ÷ input work] x 100 |
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Friction |
The force of two surfaces that touch. |
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Mechanical advantage |
The number of times the input force is multiplies by a machine; M.A. = output force ÷ input force |
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Simple machine |
A device that has only one movement; a device that makes work easier. |
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Compound machine |
A device made up of a combination of two or more simple machines.
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Compound machine |
A device made up of a combination of two or more simple machines.
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Inclined plant |
A simple machine with a flat, sloped surface (ramp).
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Wedge |
A simple machine made of two inclined planes back to back; a moving inclined plane with one or two sloped surfaces.
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Screw
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A simple machine made from an inclined plane wrapped around a cylinder.
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Lever |
A simple machine consisting of a rigid rod or plank that pivots or rotates around a fulcrum.
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Wheel and axle |
A simple machine made from two different-sized, circular objects that are attached and rotate together.
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Pulley |
A simple machine made from a grooved wheel with a rope or a chain wrapped around the groove.
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Gear |
A simple machine consisting of toothed or pegged wheels matched together to transfer motion and force.
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