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Skill 11 of 14
In Progress

Energy in rolling

The wheel is a game changer! Everyone knows that.

But exactly why?

It turns out to be because wheels don’t expend energy! (At least no ideally.)

Imagine moving a box up a hill:

  • Without wheels it is sliding. Kinetic friction does negative work, which you must balance out by doing even more work.
  • With wheels, nothing is sliding!

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References:

  1. Rolling Resistance’ (web page), Engineering ToolBox, 2008, www.engineeringtoolbox.com/rolling-friction-resistance-d_1303.html (accessed Jul. 3rd, 2020)
  2. Friction’ (encyclopedia), Encyclopædia Britannica inc., 2020, www.britannica.com/science/friction (accessed Jul. 3rd, 2020)
  3. Sears and Zemansky’s Univesity Physics with Modern Physics’ (book), Hugh D. Young & Roger A. Freedman, Pearson Education, 13th ed., 2012