Unit 1.1 Definitions

• A quantity is represented as a number and a unit
• Scalar - a quantity with a magnitude only
• Vector - a quantity with a magnitude and direction
• Resolving vectors - splitting vectors into two components euivalent to the original vector
• Density = mass / volume
• Moment of a force = force x the perpendicular distance from the point to the line of action of the force
• Centre of gravity - the single point in a body at which the entire weight of the body is considered to act