Students are asked to design an experiment about Newton’s 2nd Law. One student decides to roll a marble down a ramp into a pile of sand to measure the force impact. Which variable should she manipulate to best exemplify the relationship explained by this law?

A. She should use a heavier marble, because the marbles will roll at the same rate of acceleration but more mass will produce a larger impact force.

B. She should increase the slope of the ramp by propping it up to higher height, because a steeper ramp will cause a greater rate of acceleration and a larger impact force.

C. She should use a heavier marble, because a bigger marble will accelerate more quickly down the ramp and cause a greater impact force.

D. She should decrease the slope of the ramp, because a ramp with a smaller slope will allow the ball more time to build up speed and cause a greater impact force.