Answer :
[tex]f_s = u_sN[/tex] is relationship between the static frictional force and the normal force on an object. If they are directly proportional, would you be more likely to trust the data taken for heavy or lighter masses
The static frictional force is directly proportional to the normal force.
The exact relationship is:
fs = usN
where us is the coefficient of static friction.
When an item experiences static friction, the frictional force resists any applied force, causing the object to stay at rest until the static frictional force is removed. The frictional force opposes an object's motion in kinetic friction.
In contrast, static friction occurs when two surfaces are at rest with regard to one another. Static friction ranges in magnitude from zero to the minimum force required to initiate motion.
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