Hot Wheels come with loose axles that roll with the wheels when the cars are moving. The wheels roll, the axles (often) roll.
The common practice when modding cars is to glue down the axles so there's one less moving part in your car, which means less friction, which means more speed. I get it. Science!
But I'm not looking to debate "to fix or not to fix" your axles, I'm looking to learn what are the benefits of loose axles...are there any?
I mean, I feel like Mattel chose to make the axles loose for a reason. It seems like they could just as easily have clamped the axles down, so I don't feel like having loose axles is just a bi-product of the manufacturing process, it was a choice which means there's reason...no?
And I admit I haven't done any of my own research on this physics question at all. Google probably has all the answers but it's more fun to put our heads together.