Laws of Motion : The laws of motion that have great bearing in sports activities are known as Newton's Laws of Motion. These are :
(i) A body continues to remain in its state of rest or of uniform motion in a straight line unless it is compelled by force to change that state.
(ii) The acceleration produced in a body is proportional to the force applied.
(iii) For every action, there is always an equal and opposite reaction.
Examples of application :
(i) Running around a curved athletic track or a dodging technique in Kho-Kho or Basketball depends upon the successful application of the first law of motion as stated above.
(ii) The second law indicates that a greater force is required to reach a certain speed in a given time, if one starts from a stationary position than when he is already in motion. This law is applicable in relay races while exchanging batons in exchange zones. It points to the need for an early start by an exchange runner.
(iii) As a consequence of the third law of motion, a runner is required to push his feet against the ground with great force in order to get a similar forward propulsive force.