Originally Posted by
Matra et Alpine
As an example that many folks have seen and experienced and seldom thought through ... an empty truck takes longer to stop than a loaded one. The reason is many of the tyres have insufficient weight on them to match necessary traction to stop and so lock up VERY early adn provide zero retardation. So instead of 8 rubber patches slowign teh vehicle there are only 4 and hence longer braking distance
Maybe I misunderstood the OP, but isn’t this a bit misleading in regards to his question?
He is asking what other parameters affect “threshold braking”, is he not?
Perhaps this is something that the OP needs to clarify. Because if you are only looking at the static (rolling) coefficient of friction doubling the weight will not double your tractive force. However, if the OP is concerned with dynamic (sliding) coefficient of friction then yes, weight could have the impact you mentioned above.
"In theory, theory and practice are the same. In practice, they are not."