1. A ball of mass m is placed in a smooth groove at the centre of disc and the frame starts to rotate with angular speed w, which if the following statement are incorrect? 1) Net force on the ball is towards center. 2) Motion of ball is in radially outward direction w.r.t center. 3) Centripetal force is mw^2r 4) Motion of ball is circular. The answer to the given question states statements 1, 3 and 4 as incorrect. 2. centripetal force = mw^2r (towards center) 3. Shouldn't statement 2 be wrong as the centripetal force acts towards the center and statement 1 be correct.