The more weight the car has the slower it goes.
Weight
It would affect its speed because the weight of the car is gonna slow it down
Weight wouldn't effect speed but it would effect how quick it would get up to speed.
Arrow dynamics
Aerodynamics, weight of the car, horsepower of the engine, are all factors in the speed the car can travel.
The weight, aerodynamics, horse power and gear ratios all affect the speed of an automobile.
the fatter you are, the less speed your car will max out at, but, the more weight, the more momentum
because the weight of your wheels and the size has wind Resistance on your car
Drag coefficient and power to weight ratio come to mind .
Drag coefficient and power to weight ratio come to mind .
As far as I know it shouldn't affect top speed (assuming that is the question). Weight will affect acceleration and therefore speed after a given amount of time or distance. An example would be 1/4 mile times at a race track. But top speed should be governed primarily by the wind resistance of the body, horsepower of the engine, and the overall gear ratio in top gear. Weight may affect rolling resistance slightly and therefore affect top speed but I suspect this affect would be negligible.
All other factors being equal, a heavier toy car will move slower than a lighter toy because of it's weight.