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