Disc rolls without sliping then acceleration of center of disc is
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At first everyone would think it is the Gravitational force but, For rolling to occur, the force of gravity must not be able to overcome the static friction at the point of contact with the ground, otherwise sliding occurs. ... See, the body rolling down the hill is due to the friction acting in it.
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It's net acceleration along point of contact is zero. ... A solid disc of radius r rolls without slipping on a horizontal floor with angular velocity and ... towards center.
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