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13 Cards in this Set
- Front
- Back
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Kilogram
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the SI unit of mass.
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Pulley
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A simple machine consisting of a grooved wheel that holds a rope or a cable
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Velocity
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The speed of an object in a particular direction is the object's velocity. Velocity always includes a reference direction. Example 600 km/h south.(South is the reference direction)
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Power
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The rate at which work is done
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Net force
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The force that results from combining all the forces exerted on an object
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Mechanical Advantage
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a number that tells how many times a machine multiplies force; can be calculated by dividing the output force by the input force.
Mechanical Advantage (MA) = output force ____________ input force |
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work input
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the work done on a machine; the product of the input force and the distance through which it is exerted.
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work output
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the work done by a machine; the product of the output force and the distance through which it is exerted.
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Friction
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a force that opposes motion between two surfaces that are touching
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Weight
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a measure of the gravitational force exerted on an object, usually by the earth.
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Air Resistance
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Fluid friction that opposes the motion of objects through the air. Example 2 pieces of paper one crumpled one flat - ask mom
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Balanced forces
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forces on an object that cause the net force to be zero; balanced forces do not cause a change in motion or acceleration
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Unbalance forces
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forces on an object that cause the net force to be other than zero; unbalanced forces produce a change in motion or acceleration
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