Multiple choice

Air exerts frictional force on an object moving through it because air ____.

  1. moves in the direction of the body

  2. opposes motion of the body

  3. air increases the speed of body and its speed exerts frictional force

  4. air is very light and thin, so, it exerts frictional force
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Air exerts frictional force (drag) on moving objects because air opposes their relative motion through it. Air does not move in the same direction as the body, it doesn't increase speed, and being light doesn't cause friction - the opposition to motion is key.

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