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UPEF L1 Movie 1: Cart launched by stretched rubber band
UPEF L1 Movie 2: Cart launched by rubber band stretched even more by cart pushed further back
UPEF L1 Movie 3: Cart gently pushed toward rubber band
UPEF L1 Movie 4: Cart firmly pushed toward rubber band
UPEF L1 Movie 5: Motion of two carts connected by slightly stretched rubber band
UPEF L1 Movie 6: Motion of two carts affected by slightly compressed spring
UPEF L1 Movie 7: Motion of two carts connected by further stretched rubber band
UPEF L1 Movie 8: Motion of two carts affected by further compressed spring
UPEF L1 Movie 9: Experiments from previous movies performed using carts of different masses