Tractive Force = 3554 N"Racing Car Acceleration: Find the Tractive Force

[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 knowledgeable than myself.

Thanks,

1. Homework Statement

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

Homework Equations

F=MA

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

 

[cnh1995]

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

 

[haruspex]

44.44²=5.56²2a300

Typo - missing sign.

Force = 3.24 * 850 = 2754 joules

Wrong units.

The numbers all look right.

 

[AutumnBeds]

Typo - missing sign.

Wrong units.

The numbers all look right.

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