alleryLimiting (max static) friction is INDEPENDENT of:
AMass of object
BSurface roughness (μ_s)
CCONTACT AREA between surfaces
DNormal force
Answer & Solution
Correct answer: C. CONTACT AREA between surfaces
**Friction law:** f_max = μN.
It DEPENDS on N (which depends on mass) and on μ (surface property).
It is INDEPENDENT of the area of contact — surprising but experimentally confirmed.
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