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Friction — Science STD 8 — Question

Gujarat BoardEnglish MediumSTD 8ScienceFriction1 Mark
MCQ
A magnet can pull an iron nail toward itself. The maximum distance from which the magnet $($shown in the given figure$)$ can pull the nail is labelled as $d.$

On which surface will this distance d be relatively large?
  • A
    Cemented surface.
  • B
    Carpeted surface.
  • C
    Sandy surface.
  • ✓
    Oily surface.
✓

Answer

Correct option: D.
Oily surface.
The frictional force between the surface and the nail opposes the motion of the nail toward the magnet. The nail moves easily if this frictional force becomes less. Frictional force is less on an oily surface as compared to the force of friction on a cemented, carpeted, or sandy surface. Therefore, the distance d will be relatively large for an oily surface.

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