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
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A plastic toy car
it all depends on the height of either the ramp or how far up the ramp the toy car rolls from
at the top of the ramp the toy has a certain amount of potential energy. The amount of this energy depends on the height of the ramp and the weight of the toy. (The toy's weight is dependent on its mass and the force of gravity.) As the toy rolls down the ramp this potential energy is converted to two other types of energy: Kinetic energy and heat energy. The amount of heat energy depends on friction and air resistance. The lower the total resistance the more kinetic energy, and the more speed, the toy has at the bottom of the ramp.
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.
In optimal conditions such as infinite runway, performed in a vacuum, with a constant gravitational pull and a zero friction ramp the car could travel at the speed of light. For anything else it would depend on the ramp and the car. Also at what point you stop calling a ramp a ramp and start calling it a drop.