# Solving Physics Homework: Stopping Force & Momentum

• silviamar21
In summary, the stopping force is the force needed to bring an object to a complete stop, calculated by multiplying its mass and acceleration. Momentum is directly proportional to the stopping force, meaning that a greater momentum requires a greater stopping force. Stopping distance refers to the distance an object travels while stopping time refers to the time it takes for the object to stop, related by stopping distance = stopping time x velocity. Friction can decrease the stopping force by reducing acceleration but can increase stopping distance by causing sliding or skidding. The stopping force can also be negative if an object is accelerating in the opposite direction, such as a car's brakes failing while going downhill.
silviamar21

## Homework Statement

The engine of Sara's 1290 kg car exerts a force of 4880 N at the wheels. She accelerates for 8.73 seconds and then unfortunately, she collides with a snowbank. A) find the force that would stop her car in 2.32 seconds from the impulse of the collision. B) Calculate her momentum 1.19 seconds after her collision.

## The Attempt at a Solution

Welcome to PF, silviamar21!

Do you have a couple of equations that might be applicable to this problem?

## 1) What is the stopping force?

The stopping force is the force required to bring an object to a complete stop. It can be calculated by multiplying the mass of the object by its acceleration.

## 2) How is momentum related to the stopping force?

Momentum is directly proportional to the stopping force. This means that the greater the momentum of an object, the greater the stopping force required to bring it to a stop.

## 3) What is the difference between stopping distance and stopping time?

Stopping distance refers to the distance an object travels while it is being brought to a stop. Stopping time, on the other hand, refers to the amount of time it takes for the object to come to a complete stop. They are related by the equation: stopping distance = stopping time x velocity.

## 4) How does friction affect the stopping force?

Friction is a force that acts in the opposite direction of an object's motion. It can decrease the stopping force by reducing the acceleration of the object. However, it can also increase the stopping distance by causing the object to slide or skid.

## 5) Can the stopping force be negative?

Yes, the stopping force can be negative if the object is accelerating in the opposite direction of its motion. This can happen if the object experiences a force in the opposite direction, such as a car's brakes failing while going downhill.

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