Which of the following statements is/are correct? (A) Force of friction always…
2023
Which of the following statements is/are correct? (A) Force of friction always opposes motion of objects. (B) Force of friction always goes along the motion of objects. (C) Inertia is the natural tendency of objects.
- A.
(B) and (C) are correct
- B.
(A) and (C) are correct
- C.
Only (A) is correct
- D.
Only (B) is correct
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Correct answer: B
Answer: The statement that friction opposes motion and the statement about inertia are correct; the statement that friction goes along the motion is incorrect. Friction: Frictional force resists relative motion (or the tendency for relative motion) between surfaces. For sliding (kinetic) friction this means it acts opposite to the direction of sliding; static friction acts as needed (possibly forward or backward) to prevent relative motion. Therefore the plain phrase that friction "opposes motion" is acceptable if understood as opposing relative or impending motion.