A plastic toy car
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it all depends on the height of either the ramp or how far up the ramp the toy car rolls from
Yes Friction between the wheels and the ramp and also friction between the body of the car and the air (unless the car and ramp are in a perfect vacuum) There will be additional friction in the bearings or ball race of the wheel / axle too
There are three possible hypotheses:Smaller wheels means car rolls slower.Wheel size makes no difference.Smaller wheels means car rolls faster.Take your pick and then use the data to test your hypothesis.
The larger the angle of the ramp, the faster the car will go down it.
If you are talking about a car rolling down a ramp then yes. The taller the ramp the more momentum the car will create there for the car will travel farther and faster.