Best Wheels

Which of the following are true of the effect of friction on the Hot Wheels car at the horizontal bottom part of the ramp.
1.Friction makes the potential energy increase
2.Friction makes the kinetic energy increase
3.Friction makes the kinetic energy decrease
4.Friction makes the TOTAL energy decrease
5.Friction leaves the TOTAL energy constant

I have a rare hot wheels car that I got 2 years ago there is another the same car on ebay. It's brand new still in the box, In ten years will it be worth alot of money?

For Valentines Day I am putting together a basket of memories for my boyfriend. About 10 years ago he had a hot wheels car that was yellow blue and orange the glowed in the dark. It also had some "fins" on the side. Do you know what the name of this car is, or where I can buy one?

Thanks!

i want to take apart some of my hot wheels car s to take the windows out, they bwill look way cooler, but i don't know how to take them apart
i don't want to smash it, i was just wondering if their is a trick with the screws at the bottom

Can anyone tell me what is different between 2 wheels and 4 wheels drive car. Is Honda Civic LX 2003 is a 2 wheels or 4 wheels car. Thank.