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Simple Machines One
vocabulary definitions only.
Question | Answer |
---|---|
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 |