Which of the following are non-contact forces? (i) Gravitational force (ii) Frictional force (iii) M

JAMB Physics 2023 309 views
Source: JAMB · 2023

Which of the following are non-contact forces?
(i) Gravitational force
(ii) Frictional force
(iii) Magnetic force
(iv) Electrostatic force

  1. (i), (ii) and (iv) only
  2. (i), (iii) and (iv) only ✓
  3. (i) and (iii) only
  4. (i), (ii) and (iii) only
Explanation

A non-contact force acts without the objects touching. Gravitational, magnetic and electrostatic forces all do this.

Friction needs two surfaces in contact, so it is a contact force. The answer is (i), (iii) and (iv) only.

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