Properties of Matter
Teaching Guidance for 11-14
Talking about pressure and forces
When talking about pressure and forces be careful to distinguish between them. It is helpful to refer to:
- The pressure at a point in a liquid (pressure is a scalar – you cannot have a direction associated with it).
- Molecules bombarding a surface resulting in a force.
- The force acting on an object (forces must always act on something in a specific direction; they are vector quantities).
- The force exerted by one thing and acting on another.
- The force acting on a surface due to the pressure of the fluid.
… pressure in a fluid…
… force acting on…
… force exerted by…