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UFM L5 Movie 1: Cart with fan pushes against force probe; number of batteries varied

UFM L5 Movie 2: Different (force) strength fans push cart along track

UFM L5 Movie 3: Different (force) strength fans push backwards on cart

UFM L5 Movie 4: Same (force) strength fans push carts of different masses

UFM L5 Movie 5: Same (force) strength fans push backwards on carts of different masses

UFM L5 Movie 6: Simulation of same force strength fans pushing carts of different masses

UFM L5 Movie 7: Simulation of same scenario as Movie 6, except fan force on heavier cart varies