Science·Forces & Motion·conceptual
Deformation & Fluid Pressure
Explain forces associated with deforming objects (elastic and inelastic deformation), thermal expansion and contraction of materials, and how fluid pressure acts in all directions and increases with depth
Suggested ages 12–13
Evidence of understanding
- Distinguishes elastic deformation (returns to shape) from inelastic/plastic deformation (permanently changed)
- Explains why bridges and railway tracks have expansion gaps
- Explains why pressure increases with depth in a liquid (e.g. why deep-sea divers need pressure suits)
- Gives an everyday example of thermal expansion causing a problem or being used usefully
Assessment prompt
If Deformation & Fluid Pressure noticed the lid on a jar was very tight, could they explain why running it under hot water helps — and what's happening to the metal as it heats up?
Standards alignment
KS3.Sci.Phys.MotionAndForces.5GB · uk-nc-2013
Deformation, Thermal Expansion and Fluid Pressure
The national curriculum in England: Key stages 1 and 2 framework document · KS3