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24 Cards in this Set
- Front
- Back
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What is work as in the scientific
definition? |
you do work on an object when you
exert force on the object that causes the object to move some distance |
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What formula is used to calculate
work? |
Work= Force x Distance
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What SI unit is used to measure
work? |
newton x meter or one joule (j)
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What is the scientific definition
of machine? |
A machine is a device with which you can do work in a way that is easier or more effective.
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What formula is used to calculate
work? |
Work= Force x Distance
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How does a machine make work easier?
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By changing the amount of force
you exert and, the direction a which you exert that force |
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What is the force you exert on a machine called?
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INPUT
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What is the force exerted by the machine called?
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OUTPUT
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What is the formula for finding
the mechanical advantage? |
Output force
Input force |
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What is meant by the efficiency of a
machine? |
the efficiency compares the output work to the inputwork
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What is actual mechanical advantage?
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Actual mechanical advantage provides a real life situation, and it measures true input and output
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What is ideal mechanical advantage?
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A machine without friction, the more efficient a machine is the closer they are to ideal
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What is a first class lever by definition?
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input force is greater than the distance from the fulcrum to the output force, these levers also change the direction of input force
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What is the second class lever by definition
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These levers multiply force, they do not change the direction of the input force
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What is the definition of a third class lever
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These levers multiply distance but do not change direction or input force
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What are the six simple machines?
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incline plane, the wedge, the screw, the lever, the wheel and axle, the pulley
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What is an incline plane
What force can you exert over a long distance |
is a flat slanted surface
input force |
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What is a wedge
what force is lessened here |
a device that is thick at one end and tapers thin at one end
input force |
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What is a screw/
What force is applied to create a longer distance |
an inclined plane wrapped around a cylinder\ input force
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What is a lever?
What is a fulcrum? What force does lever foces on and what does it do? |
A rigid bar that is free to pivot,to rotate, about a fixed point
the fixed point that a lever pivots around increases the effect of input force, change s the direction of input force |
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What is an wheel and axle?
How does the wheel and axle make work easier? |
made up of two cylindrical objects that are fastened togther and rotate on a common axis.
multiples the force over a long distance |
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What is a Pulley
What force is exert and how |
is a grooved wheel with a rope(or a chain, even a steel cable)
input force, you can change the amount and direction |
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what simple machine is your body mostly made up of
Give three examples of those |
Levers, joint the top your neck, biceps, calf muscles and the ball of your foot
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what simple machine do your teeth resemble?
Explain how your teeth work |
Wedge
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