a car(54g)(toy) releases from a high place through a railway to a flat low place. by observation from an experiment, for sure there's some energy lost causing by the friction n drag force. 2nd time i do it, i add some mass(50g) for the car n releases again. i found tat the 2nd car's energy will lose less comparing with 1st car. after i counted the percentage of energy lost, i got tat the 1st car is 60%++ but the 2nd car with bigger mass is 10%++. By theorectical method, will the energy lost of a bigger mass larger than the small mass object?