Question

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What is the main difference between "a" and "g" from Newton's second law of motion!?
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Answer 1

the simple answer in short word is a is acceleration of any object and g is acceleration due to gravity which has value of 9.8m/s^2
. Newton’s Second Law explains it this way: A net force changes the velocity of an object by changing either its speed or its direction.

Therefore, an object moving in a circle is undergoing an acceleration. The direction of the acceleration is toward the center of the circle. The magnitude of the acceleration is equal to, where “v” is the constant speed along the circular path and “r” is the radius of the circular path. This acceleration is called centripetal (literally, “center-seeking”) acceleration. The force needed to produce the centripetal acceleration is called the centripetal force , which is equal to “ma” according to Newton’s Second Law (F=ma). But since “a” is  the centripetal force is equal to mv^2/r

Majestic examples of circular motion can be found throughout our Universe: Planets orbit around the Sun in nearly circular paths; moons orbit around their planets in nearly circular paths; and satellites orbit the Earth in nearly circular paths.

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