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### 23 Cards in this Set

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 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