NEWTON'S SECOND LAW OF MOTION
(DERIVATION OF F=ma)
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Newton's first law of motion defines force
rom
only qualitatively. A force is that physical cause
which changes the state of motion of a body when it
is applied on it. It means that the force produces
acceleration in the body i.e., the force is the cause
of acceleration. Now we shall see that Newton's
second law of motion gives the quantitative value of
force, i.e.. it relates force to the measurable quantities
like acceleration and mass.
It is our common experience that if we push a
tennis ball gently, a small acceleration is produced
and it acquires a small velocity in a certain time, but
if the same tennis ball is pushed hard, a larger
acceleration is produced in it and it acquires a large
velocity in the same time interval. Thus the
magnitude of two forces can be compared by
measuring the accelerations produced by them when
they are applied one by one on the same body. If a
force F, produces an acceleration of 5 m s-2 and a
force F, produces an acceleration of 10 m -2 on the
same body, then the magnitude of force F, is two
times the magnitude of force F. Experimentally
Newton found that the acceleration produced in a
body is directly proportional to the force applied on
it.
explain in short terms:-)(^^)..
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