In the distance, my sister and I are clinging for dear life to rubber donut-shaped floatation devices being dragged along at a high velocity by a motor boat on lake in southern Sri Lanka. The boat pulling us has established our net force in that direction and so, our subsequent acceleration is also in that direction. Newton's Second Law and equation acceleration = net force/ mass provides evidence for great net force. The net force is large enough to produce a large acceleration despite large masses. Perhaps if I knew the physics of the activity then, I would have been less scared. But as I did not, I cannot recommend the experience. The ordeal was heart attack-inducing.