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You can calculate the mechanical advantage of a wedge by dividing the slope by the thickness of the end.

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You can calculate the mechanical advantage of a lever by dividing the output force by the input force.

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You can calculate the mechanical advantage of a Screw by equaling the circumference to the effort force and then divide the 'pitch' of the screw.

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You can calculate the mechanical advantage of a Ramp by dividing the height of the ramp by the length of the ramp.

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You can calculate the mechanical advantage of a Wheel and Axle by dividing the axle of the wheel by radius of the axle.

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You can calculate the mechanical advantage of a pulley by counting the number for ropes that support the pulley.