Practice · 35 min

Self-Check Quiz

Fifteen questions on the core skills of Lessons 2–8: the work of a force, weight, springs and friction, the principle of work and energy, power and efficiency, potential energy, conservation of energy and curved paths. Submit to see your score and a worked solution for every question.

Before you start

How it works

  • Work on your own with a calculator and scrap paper. Try it without notes first: that shows you what you really know.
  • Nothing is marked until you press Submit quiz. Until then you can move between questions and change any answer.
  • Each question is either right or wrong. When a question has several boxes, every box must be right.
  • After you submit, you see your score, a review of every question with a worked solution, and a results sheet you can print or save as a PDF.
  • Use \(g = 9.81\ \text{m/s}^2\). Give each answer in the unit shown next to its box, and keep the sign of every work: a force that opposes the motion does negative work.

Typing answers

To enterType
\(\sqrt{2(9.81)(3)}\)sqrt(2*9.81*3)
\(\tfrac12(20)(4.08)^2\)0.5*20*4.08^2
\(150(6)\cos 30^\circ\)150*6*cos(30°)
\(-588.6\)-588.6
\(2\times 10^3\)2e3 or 2000

Each box shows how it read your entry (for example = 7.672), so you can check it before you submit. Type only the number or expression; the unit is shown next to the box.

The quiz

After the quiz

Use your results to decide what to do next. After you submit, the Results by lesson table under your score links straight to the lessons behind any questions you missed.