Work, Energy and Simple Machines

This chapter explores the scientific meaning of work, the relationship between work and energy, and the different forms of energy including kinetic and potential energy. It also introduces simple machines — levers, pulle…

• Work is done when a force produces displacement in the direction of the force.
• The SI unit of work and energy is the joule (J); $1\,\text{J} = 1\,\text{N}\cdot\text{m}$.
• Work formula: $W = F s \cos\theta$, where $\theta$ is the angle between force and displacement.

Full explanation, worked examples & memory tricks in the app