Scalar quantities describe magnitude and do not depend on direction. They include mass, area, temperature, energy, time and money. Vectors describe both magnitude and direction and can be represented by arrows with length for magnitude and direction. The triangle method and parallelogram method can be used to add vectors graphically. Speed describes rate of change in distance while velocity describes rate of change in displacement. Displacement is a vector that describes change in position, while distance is a scalar describing ground covered.