# Tractive Force

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1. Jun 12, 2017

### AutumnBeds

Hi All,

I've been asked to re-work the below as my original method was incorrect.

Below is my second attempt on the question, which I would appreciate some input from someone a more knowledgable than myself.

Thanks,

1. The problem statement, all variables and given/known data

A racing car of mass 850 kg accelerates from 20 km/h to 160 km/h over a distance of 300 metres. Frictional forces and wind resistance can be assumed to be 800N.

Determine the following:

(iii)The tractive force produced by the car to provide this acceleration

2. Relevant equations

F=MA

3. The attempt at a solution

44.442=5.5622a300

a=3.24 m/s2

Force = 3.24 * 850 = 2754 joules

Tractive Force = Force + Frictional Forces
3554 = 2754 + 800

2. Jun 12, 2017

### cnh1995

I haven't checked your numbers, but your method is correct.

3. Jun 12, 2017

### haruspex

Typo - missing sign.
Wrong units.

The numbers all look right.

4. Jun 18, 2017

### AutumnBeds

Thanks. I had newtons wrote down, Just typed the answer here wrong.