We apply a force of 200 newtons on a wooden box and push it across the floor at constant velocity. The friction force will be:

उत्तर: (B) 200 N

• (A) चूक

  Wrong: at constant velocity net force is zero, so friction equals 200 N.

• (B) बरोबर

  Correct: constant velocity means applied force = friction = 200 N.

• (C) चूक

  Wrong: friction cannot exceed the applied force if velocity is constant.

• (D) चूक

  Wrong: not balanced with 200 N.