**Contents:-**

**Types of force**- describe the force on a mass in a uniform gravitational field and on a charge in a uniform electric field
- understand the origin of the upthrust acting on a body in a fluid
- show a qualitative understanding of frictional forces and viscous forces including air resistance (no treatment of the coefficients of friction and viscosity is required)
- understand that the weight of a body may be taken as acting at a single point known as its centre of gravity
**Turning effects of forces**- define and apply the moment of a force
- understand that a couple is a pair of forces that tends to produce rotation only
- define and apply the torque of a couple
**Equilibrium of forces**- state and apply the principle of moments
- understand that, when there is no resultant force and no resultant torque, a system is in equilibrium
- use a vector triangle to represent coplanar forces in equilibrium
**Density and pressure**- define and use density
- define and use pressure
- derive, from the definitions of pressure and density, the equation Δp = ρgΔh
- use the equation Δp = ρgΔh

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