Why do lighter matchbox cars move slower than heavier?

its simple physics. by having slightly more weight, they are able to gain momentum. but at a slower rate.

think of it like this: crumple some paper until you have a size comparable to an Apple. then drop them from a second story window. you will see that the Apple will reach its terminal velocity (maximum natural speed) more quickly than the paper due to its density.

not unlike the differences in gear ratiOS. for example--an axle ratio of 4.10:1 would rise to maximum speed much faster than a ratio of 3.50:1. however the 3.51 ratio would achieve a higher top speed.

i hope this helps : )