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Simple Machines One

vocabulary definitions only.

QuestionAnswer
Machine A device that makes work easier.
Input Force The work you DO on a machine.
Output Force The work done BY the machine on an object.
Mechanical Efficiency A comparison of a machine’s work output with the work input.
Mechanical Advantage Number of times the machine multiplies the force.
First Class Lever A lever with the fulcrum in the middle.
Second Class Lever A lever with the load or resistance in the middle.
Third Class Lever A lever with the input (effort) force in the middle.
Fulcrum Fixed position on a lever.
Compound Machine A machine made up of 2 or more simple machines.
Screw An inclined plane wrapped around a post.
MA = 1 Mechanical Advantage of a fixed pulley.
MA = 2 Mechanical Advantage of a movable pulley.
Wheel and Axle Inclined plane wrapped around a post.
Mechanical Advantage of a Wheel and Axle MA = Radius of Wheel / Radius of Axle
Friction Prevents machines from being 100% efficient
Created by: slemieux