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23 Cards in this Set

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