[Diggedy]

The driver of a car travelling in a straight line, level road suddenly brakes.
The car slides 10m in 2 seconds before stopping. Assuming constant deceleration, find the co-efficient of friction between the tyres and the road.

I got given this question as homework after doing a lecture on turning moments so that put me on the wrong foot straight away.

So ive assumed I need to find the velocity first using d/t the find the acceleration using s=u.t + 0.5.a.t²

but then im lost. Can anyone point where im going wrong?

[Hans Moleman]

You need to use

The normal reaction , and the frictional force

So you just need to calculate the acceleration of the car, and then you can find

[Diggedy]

so do I need the mass value to complete this?

[Hans Moleman]

No, the mass cancels out

[Diggedy]

would you also use this method for this question



or would this be better solved using the energy method?