In Progress
Skill 13 of 14
In Progress


  • Push a box over the floor. It takes effort and requires work being done, meaning energy being spent.
  • Now push it faster over the same distance. It feels like taking more effort. But it’s still the same work that must be done, the same amount of energy being spent.

Why does it feel tougher, then?

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  1. Sears and Zemansky’s Univesity Physics with Modern Physics’ (book), Hugh D. Young & Roger A. Freedman, Pearson Education, 13th ed., 2012
  2. Power’ (web page), Glenn Elert, The Physics Hypertextbook, physics.info/power (accessed Jul. 7th, 2020)