# Net Force of Car: Solving for 70kg Driver Deceleration

• pats6
In summary, the problem is asking for the net force acting on a 70-kg driver who is decelerated from 21m/s to rest in a distance of 1.0m. To solve this, we need to first find the acceleration, which can be done using the equation v^2=Vo^2+2aDx. Then, we use the equation F=ma to calculate the net force, using the mass of the driver and the acceleration calculated.
pats6
1. The problem statement,

A driver wearing a seatbelt decelerates at roughly the same rate as the car itself. Since modern cars have a "crumple zone" built into the front of the car, the car will decelerate over a distance of roughly 1.0 . Find the net force acting on a 70-kg driver who is decelerated from 21m/s to rest in a distance of 1.0m .

## Homework Equations

I am having trouble setting this problem up can someone help

## The Attempt at a Solution

First you need the acceleration.
They decelerate from 21m/s to 0 in 1.0m. Which motion equation only has speed, acceleration and distance ?

Then you need the equation the relates force, mass and acceleration.

Is d = vt + (1/2)at^2 the right formula if so we do not have time

ok so i would use v^2= Vo^2+2aDx
That woud give me acceleration and then I would use F=ma and use the mass of driver and the acceleration calculated to find the net force

## What is the net force of a car?

The net force of a car is the sum of all the forces acting on the car, including the force of gravity, air resistance, and the force of the engine.

## How do you calculate the net force of a car?

To calculate the net force of a car, you need to know the mass of the car, the acceleration, and the direction of motion. The formula for net force is mass multiplied by acceleration.

## What is the significance of a 70kg driver in calculating the net force of a car?

The mass of the driver is an important factor in calculating the net force of a car. The heavier the driver, the more force is needed to accelerate or decelerate the car.

## What is the deceleration of a car with a 70kg driver?

The deceleration of a car with a 70kg driver can vary depending on the circumstances, such as the speed of the car and the force applied by the brakes. However, assuming a constant deceleration, it can be calculated by dividing the net force by the mass of the car and driver.

## How can the net force of a car be used to improve safety?

Understanding the net force of a car is crucial for improving safety. By knowing the forces acting on a car, engineers can design safer cars and roads, and drivers can adjust their driving habits to reduce the risk of accidents.

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