alleryIn which scenario is the force of FRICTION the maximum on a 50 kg box?
AThe box is on smooth glass
BThe box is suspended in air
CThe box is on rough sandpaper
DThe box slides smoothly on ice
Answer & Solution
Correct answer: C. The box is on rough sandpaper
Friction depends on the surfaces in contact.
Rough surfaces (like sandpaper) produce more friction than smooth ones (glass, ice).
A suspended box has no contact surface, so no friction.
**The classic ranking for these examples:** sandpaper > smooth glass > ice > air.
This is why we deliberately make tyre treads rough, hands holding tools rough, etc.
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