Question 15
Which makes loosening a tightly stuck nut easier, and why?
The right answer is the one marked above.
The long-handled spanner, because it increases the perpendicular distance. Since moment = force × perpendicular distance, a greater length delivers a larger moment from the same pull of the hand.
The weight of the spanner has nothing to do with it. All that counts is the distance from the nut out to your hand.