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21 Cards in this Set
- Front
- Back
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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 energy: |
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.Inclined plane: 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 twosloped surfaces. |
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Screw: |
a simple machine made from an inclined plane wrapped around a cylinder.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 rotatetogether. |
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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. |
