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## Main Question or Discussion Point

**Calculating "Additional" Braking Torque Due To Momentum**

Hi,

First off this is not a homework problem :-)

I'm trying to understand how one could calculate the "additional" torque that vehicle brakes have to apply due to it's momentum?

I have been told that when you consider the vehicle a "closed system" then you don't have to worry about momentum.

However, my case would be more like if I could attach an external torque sensor to the brakes and see the values due to different masses at a given velocity.

The same set of brakes have to work harder to stop a fully loaded semi-truck versus an empty one in the same time/distance, right?

I know that momentum is p=mv and t=fd and I will have to look at an instance/moment of time as the velocity of the vehicle will change as the brakes are applied which is fine.

I would like to know how to make this calculation to determine the torque/forces applied to say the front wheel where it touches the ground.

So for example what would be the instantaneous momentum torque for a 1000kg vehicle travelling at 100km/hr at the front wheel the moment the brakes are applied?

I hope this makes sense.

Thanks for your help!

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