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Question
A jack screw is provided with a long arm. Explain why?
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Solution
A force is supplied at a position on the body where the distance from the axis is maximum in order to maximise the screw jack's turning effect. In order to give the screw jack the highest torque possible given the supplied force. The formula for the turning effect of the body is moment of force (torque) = force applied × perpendicular distance of force from the axis of rotation.
As a result, the jack screw may apply more force the longer its arm.
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