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23 Cards in this Set
- Front
- Back
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A device with moving parts that work together to accomplish a task is a
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MACHINE or MECHANICAL SYSTEM
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What the machine does is called
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OUTPUT
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What you do to make a machine work is called
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INPUT
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An unpowered mechanical devices is a
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SIMPLE MACHINE
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A machine made up of several simple machines could be called a
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COMPLEX MACHINE or MECHANICAL SYSTEM
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A block and tackle involves which simple machine?
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PULLEY
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Force applied to the machine is called
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INPUT FORCE
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The force the machine applies to move a weight is called
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OUTPUT FORCE
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The ratio of output force to input force is
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MECHANICAL ADVANTAGE
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Why does a task seem easier when using a machine?
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MACHINES MULTIPLY INPUT FORCE (less input force is required, but over more distance, so it seems easier)
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Which has greater mechanical advantage, stairs or ramps?
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RAMPS
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What are the units for mechanical advantage?
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there are no units
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What is the equation for mechanical advantage?
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Fo/Fi
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How else can you determine the mechanical advantage of a pulley?
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MA=# support strands
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WHat is the symbol for mechanical advantage?
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MA
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What is the symbol for input force?
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Fi
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What is the symbol for output force?
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Fo
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What equation describes the relationship between force and distance of a lever in equilibrium?
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Fo x output arm = Fi x input arm
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What is another equation for finding MA of a lever?
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INPUT ARM/OUTPUT ARM
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The fixed point around which a lever rotates is called a
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FULCRUM
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From the fulcrum to the output force is called the
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OUTPUT ARM
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From the fulcrum to the input force is called the
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INPUT ARM
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What can affect the mechanical advantage of a lever?
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ARM LENGTH and FORCE
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