Galileo hypothesized that a ball rolling along a flat surface with no change in speed would _________.
A) have no net force acting on it
B) accelerate, depending on its mass
C) have a net force acting on it, upward from the surface
D) slow down as it rolled down a slope
E) speed up as it rolled up a slope

Question

Quizplus · Accepted Answer

Galileo's hypothesis was that an object in motion will remain in motion at a constant speed in a straight line unless acted upon by a net external force. This is consistent with the idea of inertia and Newton's first law of motion.

Galileo Hypothesized That a Ball Rolling Along a Flat Surface