Understanding force is essential to understanding movement. Although
kinetics is about explaining cause and effect in movement, understanding force
is a key concept of kinetics. (Kirk, et.al, p.9). Force is ‘something that
possesses the capability to cause a change in motion or shape of the system
(i.e. a “pull” or “push”)’ (McLester, et. al., p.40). Newton’s second law
states that, ‘A force applied to a body causes an acceleration of that body of
magnitude proportional to the force, in the direction of the force, and
inversely proportional to the body’s mass’ (Hall, p.388). The swing back of the
tennis racket is therefore important to ensure the force is a lot greater so
that when the racket and ball come in contact, the speed of the ball is at its
maximum.
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