Work, Energy, and Simple Machines

This chapter explains the scientific meaning of work, how it depends on force, displacement and the angle between them, and how work can be positive, negative or zero. It then introduces energy in its kinetic and potenti…

• Work is done only when a force acts on an object AND the object is displaced.
• Work is a process of energy transfer, not something an object possesses.
• The mathematical formula for work is $W = F \times s \times \cos\theta$.

Full explanation, worked examples & memory tricks in the app