Physics 2






“…Science is simply common sense at its best – that is, rigidly accurate in observation and merciless to fallacy in logic…”

-         T. H. Huxley



It is a fine spring evening and you are standing on the banks of a big lake. You are amazed. It is a clear day. The wind is blowing from northeast to southwest. You see a hundreds of boats sailing in every direction possible. How is that? You ask yourself in the same vein, as a bowler would have vociferously appealed to the umpire for a leg before decision in cricket! What makes it possible? Then it dawns on you that it depends on the way you set your sails! And that is decided by the Sailor! There lies the secret of windsailing – whether it is on water or land! 

Science of Physics: 

Windsailing whether it is on water or land, is based on the theories and principles of physics. Let us consider some of the theories and principles of physics that has a direct bearing on the principles of sailing. 

Ř      Laws of Motion: The relationship between motion and its cause is known as “Dynamics”. The cause or force is the speed of wind and motion is the resultant movement of the land sailing yacht. It should be 15˚ and 25˚ for a smooth and quick acceleration.

Sail at 15˚ angle of air strike:

Sail at 40˚ angle of air strike:

Here there is no smooth flow of air. There is an abrupt loss of power. This sort of stalling slows down the yacht.

Ř      Particle Dynamics: It is the study of relation between the force and effect it produces particularly on motions is known as particle dynamics. The force is wind and the effect it produces on yacht is motion. [Continued in the next article on this site]