Motion in Two Dimensions Scalars and Vectors Scalars have magnitude only. Temperature, speed, mass, and volume are examples of scalars.
Vectors have magnitude and direction .
Position, displacement, velocity, acceleration and force are examples of vector quantities. Vectors are equal if they have the same magnitude and direction . Vectors must have the same units in order for them to be added or subtracted. The negative of a vector has the same magnitude but opposite direction. The projections of a vector along the axes of a rectangular co-ordinate system are called the components of the vector.