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simple plane is any kind of device that only requires a single force to work. Work occurs when force is given and the cause movement along a certain distance. Work that arise are the result of force and distance. The amount of work needed to achieve something is constant, however the amount of force needed to accomplish this can be reduced by applying less force to a greater distance. In other words, the increase in distance would reduce the force needed. The ratio between the two is called mechanical advantage.