The gravity of the washers plays a role in generating tension in the experiment, thus making the trolley move. In the experiment to explore the relationship between the movement of the trolley and the magnitude of the tension, the washers generate tension on the rope through the action of gravity, and this tension is the driving force that drives the trolley forward. When the number of washers increases, the gravity increases, the tension also increases, and the trolley moves faster; conversely, when the number of washers decreases, the trolley moves slower.
In addition, washers also play a role in transmitting force in the experiment. The gravity of the washers causes the rope to generate tension, which is transmitted to the trolley through the rope to make it move. Therefore, the gravity of the washers not only generates tension, but also ensures that this force can be effectively transmitted to the trolley, thereby controlling the movement state of the trolley.
