# Car with different mass travelling down a ramp

Recently I conducted an experiment at school to see if mass affected the distance travelled by a car after reaching the bottom of the ramp. We used the same toy car and placed different weights on the car, releasing it from a marked line on the ramp. After collecting our data we found that the heavier the toy car the smaller the distance travelled by the car, after reaching the bottom of the ramp. What is the scientific explanation for this result? Why does this happen?

• Best guess for me is design flaw which is causing an unknown friction or drag with added mass. Think of an axle pressing against the wheel when pushed downwards. Apr 6, 2022 at 7:56
• It is difficult to say what might be the reason for results you are seeing. In the simple model of friction force we use, coefficient of friction does not depend on mass, and the final velocity should be the same in both cases. For us to be able to comment, you should provide numbers from your experiments and description of the equipment (car and ramp) used. Apr 6, 2022 at 10:45
• What sort of wheels does your toy car have? rubber or solid? Apr 6, 2022 at 10:46
• It would help to post photographs of the cars with detailed explanations of their parts and construction. Include how weight is added. Aug 28, 2023 at 1:27