Multiple choice

Fill in the blanks.

Force of friction is ________for a rough surface. Spilling oil on the rough surface ______the friction.

  1. small; increases

  2. small; decreases

  3. large; increases

  4. large; decreases
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Yes, it is correct.The rough the surface, the greater the opposing force, i.e. friction. Oil acts as a layer between the two surfaces and so reduces the friction.

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