- #1
cassienoelle
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Homework Statement
The coefficent of static friction between the floor of a truck and a box resting on it is 0.36. The truck is traveling at 70.0 km/hr. What is the least distance in which the truck can stop and ensure that the box does not slide?
Professor gave us these clues:
It is the static frictional force exerted on the box by the truck that causes the box to accelerate. The static frictional force is:
fs≤μs*N
Since we're are interested in stopping in the least amount of time possible, the frictional force must be equal to the maximum possible static frictional force (which results in the largest acceleration):
fs=μs*N
Homework Equations
so if fs=Us*N
The Attempt at a Solution
where the heck can i find N and fs? If I have no mass given i can't find N?
I've figured out that the speed is 19.44m/s :)