The physics of car racing

1. What has been done to make this a fair test?
we all have the same car

2. What forces are needed to make the car go faster and how have you modified car accordingly?
Gravity, push, acceleration, thrust.

3. What forces are needed to to make the car stop and what adjustments have you made to try and stop it by the line? My group tried to put rubber bands on to slow it down.

4. What forces are needed to make the car travel further and what adjustments have you made to achieve this? We put a rock on the car so it goes slower.