![]() ![]() If the same ball then hits the floor it exerts a force on the floor and the floor exerts an equal and opposite force on the ball. The racket exerts what is known as the action force and the ball exerts the reaction force which is felt by the player in the increased resistance at the time the racket strikes the ball. Or to put it exactly how Newton put it – ‘For every force that is exerted by one body on another, there is an equal and opposite force exerted by the second body on the first.’ This is sometimes referred to as the law of reaction.įor example, when a Tennis player hits a ball the racket exerts a force on the ball and the ball exerts an equal and opposite force on the racket. “For every action, there is an equal and opposite reaction.” A useful way of writing Newton’s second law of motion, particularly when doing calculations, is Force = mass x acceleration (or F=ma). Put more simply, this means that when the golf ball, from the example above, is struck by the golf club the rate of change of momentum (or velocity) of the ball is proportional to the size of the force acting on it by the club. “When a force acts on an object, the rate of change of momentum experienced by the object is proportional to the size of the force and takes place in the direction in which the force acts.” A force causes a moving body to decelerate?.A force causes a moving body to accelerate?.A force causes a moving body to change direction?. ![]() Questions: Can you give examples in sport where: wind resistance) or change its direction (e.g. Or that same golf ball will continue to move at a constant velocity unless a force acts on it to slow it down (e.g. For example, a golf ball will remain still unless a force, applied by the golf club, makes it move. This is also known as the ‘law of inertia’ and means that something will either stay still or stay moving unless a force acts on it. “A body continues in a state of rest or uniform velocity unless acted upon by an external force.” ![]()
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