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Explain why the handle of a door is placed as far as possible from the hinges.
Explain why it is easier to loosen a tight nut using a spanner with a long handle than the one with a short handle.
Increasing perpendicular distance between pivot and line of force increases moment making it easy to open door or loosen nut
Placing the handle far as possible increases the perpendicular distance from turning point to line of action of force, hence small force applied at the handle produces large moment, making it possible to open a door easily
The longer the perpendicular distance to the line of action of the force, the greater the moment of the force, hence less force is needed