Final answer:
The dependent variable in Mr. Sam's experiment is the distance the ball rolls off the ramp, as it is the outcome that is measured and depends on the varying mass of the ball.
Step-by-step explanation:
In Mr. Sam's experiment, the dependent variable is the distance the ball rolls off the ramp. The dependent variable is the outcome that is measured in an experiment, which in this case depends on the mass of the ball. When setting up a similar experiment to test the relationship between force and acceleration, the independent variable would be the force applied to an object, and the dependent variable would be the acceleration of the object. One would need to ensure that the mass of the object remains constant to accurately measure how force affects acceleration without the interference of mass.