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Some resources have pre-requisites; where this is the case, you'll be able to access any required resources through the Pre-requisites section.

- Forces
- Moments
- Pressure
- Reaction

- Algebra
- Areas and volumes
- Arithmetic
- Integration

and stability

Dams are important engineering constructions and are found all around the world. When designing a dam, an engineer must ensure that its construction will be strong enough to hold back the weight of water that will accumulate behind it. How can an engineer determine the force exerted by the water?

Resources

**Mechanical:** Centre of gravity | Forces | Moments

**Mathematics:** Ratios | Algebra

**Prerequisites: ** None

Resources

**Mechanical:** Centre of gravity | Forces | Moments | Reactions | Resolving forces on an inclined plane

**Mathematics:** Angles | Trigonometric identities

**Prerequisites: ** Centre of gravity of composite bodies

Resources

**Mechanical:** Forces | Friction

**Mathematics:** Trigonometric calculations and identities

**Prerequisites: ** Forces, centre of gravity, reactions and stability

Resources

**Mechanical:** Direct forces | Concurrent co-planar forces | Forces diagram | Resultant of a set co-planar forces | Conditions for equilibrium and motion | Newton's second law

**Mathematics:** Vector addition | Resolving a vector into two perpendicular components | Trigonometric functions for sine and cosine | Trigonometric identities | Simultaneous equations

**Prerequisites: **None

Resources

**Mechanical:** Displacement | Speed | Velocity | Acceleration | SUVAT equations | Distance-time graphs | Velocity-time graphs | Acceleration-time graphs

**Mathematics:** Algebra | Gradients | Graphs | Quadratic equations

**Prerequisites: ** None

Resources

**Mechanical:** Displacement | Speed | Velocity | Acceleration | SUVAT equations | Resolving a vector into perpendicular components | Projectile motion | Fluid flow rate

**Mathematics:** Algebra | Trigonometric identities| Trigonometry| Quadratic

**Prerequisites: ** Motion of a tube train - SUVAT