Lifting a heavy bag : Muscular Force :: Brake pads rubbing against a bicycle wheel rim : ___?

Lifting a heavy bag : Muscular Force :: Brake pads rubbing against a bicycle wheel rim : ___?
  1. Electrostatic force
  2. Frictional force
  3. Magnetic force
  4. Gravitational force

Solution

Lifting a bag relies on muscular force, while brake pads slowing down a wheel rim relies on contact frictional force.

Asked in: Homi Bhabha Practice

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