lets say there is ball inside a bus that is accelerating. When the bus accelerates, the ball dosent slip or move, due to strong static friction. so in Earths frame of reference, the only forces are the mg and Normal force. in the bus's frame of reference, there is a fictious force pushing the person back with mg and normal force. Now let say there is a same scenario, except in this scenario, the ball does roll. in this case, would the freebody diagram still remain the same for both references?