Forces and Motion

Book Launch

Enrichment Activity for 5-11 11-14

What you need

  • A copy of Marvin and Milo’s Adventures in Science (available from bookshops and online retailers)
  • A piece of paper smaller than the book


  1. Hold the book and the paper horizontally and drop both at the same time. Notice which one hits the ground first.
  2. Now put the piece of paper flat against the bottom side of the book and drop them together. What happens?
  3. Drop them again, but this time with the paper on top of the book. What happens?

Results and Explanation

Air resistance means that when dropped separately, the book and paper hit the ground at different times. But when they are dropped together, the larger book sweeps the air out of the way and the two fall at the same rate.

features in Stokes' Law
is a special case of Force
is used in analyses relating to Terminal Velocity
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