Biomechanics & Sports

Every sprint start, every curving free kick and every lift in the gym is governed by the laws of physics acting on the human body. Biomechanics is the branch of sports science that studies exactly this — how forces, levers and motion combine to produce movement. This chapter of the CBSE Class 12 Physical Education course (Unit VIII: Biomechanics & Sports) builds that understanding across five linked ideas:

• Newton's Laws of Motion and how they explain sporting actions.
• Levers in the human body and their application in sports.
• Equilibrium — static and dynamic — and the centre of gravity.
• Friction and its role in games and sports.
• Projectile motion in sports.

A famous example shows why this matters. In 1997 the Brazilian defender Roberto Carlos struck a free kick from about 35 metres that curved impossibly around the defensive wall and into the net. The ball swerved because of the spin he gave it: the spinning surface made the air pressure unequal on its two sides, and the ball bent towards the low-pressure side — an effect physicists call the Magnus effect (the 'banana kick'). The same physics of force, spin and trajectory that bent that ball is what you will learn to analyse in this unit on biomechanics.