# Quick question: If a car speed increases, does its weight increase or decrease?

• wajed
In summary, the weight of a car does not change as its speed increases due to the constant force of gravity. Some people may mistakenly believe that a car's weight increases with speed due to the feeling of inertia. There is no direct relationship between a car's speed and weight, as they are determined by different factors. However, a heavier car may have a slower maximum speed and different handling and performance compared to a lighter car.
wajed
why? why not?

Yes, because weight is related to relativistic mass, not rest mass? But I should really brush up on the submarine paradox before committing too strongly..

Yes, because gasoline is burnt and vented as exhaust. Unless it's not your normal car...

wajed said:
why? why not?

You must show your own work in order for us to help you on homework/coursework questions. What are your thoughts on why or why not?

## 1. Does the weight of the car increase or decrease as its speed increases?

The weight of the car does not change as its speed increases. Weight is a measure of the force of gravity on an object, and this force does not change with an increase in speed.

## 2. Why do some people think that a car's weight increases as its speed increases?

Some people may think this because of the physical sensation of inertia. As the car speeds up, passengers may feel a force pushing them back into their seats, giving the illusion that the weight of the car has increased. However, this is due to their own bodies experiencing an acceleration, not a change in the car's weight.

## 3. Is there any relationship between a car's speed and its weight?

No, there is no direct relationship between a car's speed and its weight. The weight of a car is determined by its mass and the force of gravity, while its speed is determined by its engine power, aerodynamics, and other factors.

## 4. Can increasing a car's weight affect its speed?

Yes, increasing a car's weight can affect its speed. A heavier car will require more energy to accelerate and maintain a certain speed, so it may have a slower maximum speed compared to a lighter car with the same engine power.

## 5. How does the weight of a car affect its handling and performance?

The weight of a car can affect its handling and performance in various ways. A heavier car may have more stability and grip on the road, but it may also have a longer braking distance and be less agile. On the other hand, a lighter car may have quicker acceleration and be easier to maneuver, but it may also be more prone to skidding and losing control. Overall, the weight of a car is just one factor among many that can impact its handling and performance.

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