A lighter car is not necessarily faster than a smaller car, as it depends upon the power of the vehicle. If the question is asking whether a smaller or lighter car is necessarily faster than a larger car, again the answer is "no". The larger car can easily be more powerful.
A heavier car does not necessarily go faster than a lighter car. In fact, factors such as engine power, aerodynamics, and tire grip have a more significant impact on a car's speed. A lighter car may actually accelerate more quickly due to its lower weight.
No, a heavier balloon car does not go faster. The speed of the balloon car is determined by the amount of force produced by the balloon pushing the car forward, not by its weight. In fact, a lighter balloon car may actually travel faster because there is less mass to accelerate.
The mass of a toy car will affect its speed. A lighter car will accelerate faster than a heavier car, assuming all other factors (such as the force applied) are constant. However, once in motion, a heavier car may maintain its speed better due to its inertia.
It takes longer for a heavier car to stop than it does a lighter one. Velocity increases as mass increases in turn increasing the time needed to stop (trains, semi trucks).
The train is heavier than the car is and the train has more things in the back. The train is heavier than the car is and the train has more things in the back.
A heavier toy car is better to go down a ramp and make a jump better than a light car because the heavier the toy car is, the faster gravity will force it to roll down the ramp, and with all its speed, be able to make the jump. Of course, you wouldn't want to make the toy car so heavy so that it barely or doesn't move at all. Just like drops of water when it's raining outside and a few drops hit your window. The heavier drops drip off faster than the smaller ones, and that goes the same with cars, too.
No.
If you are using the car for any sort of racing purposes then a lighter model is preferred.
A heavier car has more inertia, resistance to a change in motion, than a lighter vehicle. Therefore in the event of a crash the lighter vehicle will have a greater change in motion relative to the heavier vehicle; the less the change in motion, the safer.
A brick would be lighter.
The lighter weight car takes less time to gain momentum, than a heavier weight truck.