Acceleration-Trolley-Apparatus-RVFM-PH10535-P-This-Acceleration-Trolley-Apparatus-demonstrates-that-gravitational-acceleration-down-an-incline-is-independent-of-the-falling-mass-P-P-The-two-wheeled-trolley-runs-across-the-room-hanging-from-an-inclined-overhead-cable-&-can-be-loaded-with-various-masses-to-see-if-there-are-any-changes-in-acceleration-P-RVFM-Acceleration-Trolley-Apparatus