# Momentum of a Car: What Happens When Stopping?

• mprm86
In summary, the momentum of a car in movement is transferred to the Earth when it stops due to forces acting on it such as air resistance and friction. This transfer of energy results in the car's velocity becoming 0, causing the momentum to also become 0. However, in an isolated system, momentum is conserved and the change in momentum is transferred to the Earth, although it is not measurable due to the Earth's larger mass.
mprm86
What happens to the momentum of a car in movement when it stops?

The car has forces acting on it to slow it down, they all do work on the car, and the energy is transferred through the air resistance and friction.

it should be 0 because the velocity becomes 0 when the car stops. (Momentum is mass in motion)

mprm86 said:
What happens to the momentum of a car in movement when it stops?
In an isolated system, momentum is conserved. The momentum of the car when it brakes to a stop, is transferred to the earth. But the Earth's mass is so much larger than the car's that the Earth's change in rotation speed is not measurable.

## 1. What is momentum?

Momentum is a measure of an object's motion, specifically the product of its mass and velocity.

## 2. How is momentum related to a car's stopping?

When a car is in motion, it has a certain amount of momentum. In order to stop the car, this momentum must be reduced to zero. This can be achieved by applying a force in the opposite direction of the car's motion.

## 3. Why is momentum important in car safety?

Momentum is important in car safety because it determines how much force the car exerts in a collision. The higher the momentum of a car, the more force it will exert upon impact, which can result in more severe damage or injury.

## 4. What factors affect the momentum of a car?

The momentum of a car is affected by its mass and velocity. A heavier car or a car moving at a higher speed will have a greater momentum.

## 5. How can the momentum of a car be reduced when stopping?

The momentum of a car can be reduced when stopping by applying brakes or friction to the car's wheels. This will decrease the car's velocity and therefore its momentum.

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