Physics · JEE | LAWS OF MOTION

Consider the following statements regarding contact forces in mechanics: (A) The component of contact force normal to the surfaces in contact is called normal reaction. (B) The component of contact force parallel to the surfaces in contact is called friction. (C) Different contact forces of mechanics fundamentally arise from electrical forces between charged constituents. (D) Frictional force opposes actual or impending relative motion and is an empirical relation. Which of the above statements are correct?

1. A
   (A), (B) and (C) only
2. B
   (B) and (D) only
3. C
   (A), (C) and (D) only
4. D
   (A), (B), (C) and (D)