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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.

- Centre of gravity
- Forces
- Moments

- Ratios
- Algebra

The centre of gravity of an object is the average position of the weight of an object.

The motion of an object can be completely described by the translation of the centre of

gravity, and by rotations about the centre of gravity.

When an object is static, its tendency to tip, or resist tipping, is determined by the position of the centre of gravity relative to the base upon which the object is resting.

How can you determine the position of the centre of gravity of an object?

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:** Forces | Reaction | Pressure | Moments

**Mathematics: **Algebra | Areas and volumes | Arithmetic | Integration

**Prerequisites: ** Centre of gravity, reactions and stability & Friction and sliding

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