The speed is ultimately dependent on the power rating, horsepower/kW - not the size as such. You can have a big and inefficient engine that puts out a lot less than a small and highly tuned engine.
An engine's power is determined by two factors, the turning force the engine can create and how fast it can spin for a given amount of turning force.
To get good speed you need a bit of both. Amazing turning power but only one turn/minute wouldn't work particularly well. Nor would an engine that'd spin like crazy but very weakly.
Generally, bigger engines are better at turning force and poorer on spin, while smaller engines are better at spin but poorer at turning force.
Now, obviously there are things you can do with gear boxes, to turn slow and strong into fast and a bit weaker, or fast and weak into slower and stronger.
But usually, for two engines built to the same degree of tuning, the bigger engine should have more power and be able to provide more speed.
It would affect its speed because the weight of the car is gonna slow it down
The size of the tyre affects top speed by altering the gearing. Assuming the engine has the power, a larger size wheel and tyre (diameter) will result in higher top speed.
Aerodynamics, weight of the car, horsepower of the engine, are all factors in the speed the car can travel.
the fatter you are, the less speed your car will max out at, but, the more weight, the more momentum
If you mean your car has a big engine but your car isn't going as fast as you know the car can with that size of engine. If that's what your thinking of than your car probably has a chip wich is limmitin your speed.
I think speed(size)
because the weight of your wheels and the size has wind Resistance on your car
First off, it is not a motor, it is an engine. Of course the engine effects speed. It takes horsepower and torque to move a vehicle. The power of the engine determines how fast the car will go. The gear ratio of the transmission and the differential also determine the speed.
Yes it will affect the speed of the toy car. Example: A buggy is easier to push without any groceries in it.
The placement wouldn't affect the speed, but would affect the handling.
It changes the ratio between the engine rpm and the drive wheel(s) rpm.