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• Machines make work easier
• It multiplies the amount of force you exert,
• It multiplies the distance over which you exert your force,
• It changes the direction in which you exert your force.
• A machines mechanical advantage is the number of times a force exerted on a machine in multiplied by the machine.
• Input Force is the amount of force you exert on the machine.
• Output Force (resistance force) is the amount of force exerted by the machine.
• Mechanical Advantage = Output Force / Input Force   (MA=OF/IF
• The efficiency of a machine compares the output work to the input work.
• Efficiency of a machine is expressed as a percent.
• The higher the percent, the more efficient the machine.
• NO machine is 100% efficient due to friction.
• The mechanical advantage that a machine provides in a real situation is called the actual mechanical advantage (AMA).
• AMA can only be gotten by measuring true input and output.
• The mechanical advantage of a machine without friction is called the ideal mechanical advantage (IMA) of the machine.