In this world, rotations are more common than the linear motion.  The planets revolves and spins; the electron circles; the wheels roll; the motor and the engine runs; even opening and closing a door is a partial rotation.    Force required :  Newton says that if a body is given a push, it will only move in a straight line.  Hence, to keep the body in rotation, a force must act and it should a...

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kannan narayanan

blogs from Tiruchirappalli