roll — to move by turning over and over

a young child gives a big push to a colorful beach ball at the top of the hill. The ball immediately begins turning over and over as it moves down the slope. As gravity takes effect, the ball picks up speed while rotating continuously. The ball's surface shows clear rotation marks as it tumbles down the incline. Other children chase after the rolling ball with excited expressions. A dog runs alongside barking playfully at the moving sphere. the ball moving by turning over and over