explain why a jack screw is provided with a long arm
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Why is jack screw provided with a long arm?
moment of force (torque) i.e. the turning effect of a body(here,screw jack)= force applied X perpendicular distance of force from the axis of rotation.
so in order to produce maximum turning effect of the screw jack by a force, the force is applied at a point on the body for which the distance from the axis is maximum so that the given force provides maximum torque to turn the screw jack.
Thus,the screw jack is provided with a long arm.
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A jack screw is provided with a long arm in order to have the effort less than the load. Therefore, the long arm of the jack screw, the more force it can apply
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