Which of the following physical actions can take place ONLY when two surfaces are in direct physical touch…

Which of the following physical actions can take place ONLY when two surfaces are in direct physical touch with each other?
  1. Iron filings clinging to a bar magnet
  2. A goalkeeper punching away a flying football
  3. A dry plastic comb pulling loose hair strands
  4. A coconut falling down from a tree top

Solution

Stopping or punching a ball requires physical contact (contact force), while magnetic, electrostatic, and gravitational forces act at a distance.

Asked in: Homi Bhabha Practice

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