Question

a force which makes a sail boat move?​

Answer 1

Explanation:

The sail “lifts,” or moves, toward the lower-pressure side causing the boat to move. This happens because the sail isn't a flat sheet of cloth, it's curved, like a wing and the air traveling over the topside of the curved portion travels faster than that traveling on the underside.

Answer 2

Sailing downwind (parallel to the wind, like the boat at left) is easy to understand: the wind blows into the sails and pushes against them. The wind is faster than the boat so the air is decelerated by the sails. The sails push backwards against the wind, so the wind pushes forward on the sails.