What you'll learn
How forces deform materials and create pressure.
Key ideas
- Hooke's law (force ∝ extension) and the limit of proportionality.
- Elastic potential energy; pressure = force ÷ area.
Exam tips
- Note when a spring stops obeying Hooke's law.
- Use pressure = force ÷ area with correct units.
Common mistakes
- Ignoring the limit of proportionality.
- Confusing force and pressure.