Scalar Quantity Scalars are quantities which are fully described by a magnitude alone. Magnitude is the numerical value of a quantity. Examples of scalar quantities are distance, speed, mass, volume, temperature, density and energy. Vector Quantity Vectors are quantities which are fully described by both a magnitude and a direction. Examples of vector quantities are displacement, velocity, acceleration, force, momentum, and magnetic field. Example 1 Categorize each quantity below as being either a vector or a scalar. Speed, velocity, acceleration, distance, displacement, energy, electrical charge, density, volume, length, momentum, time, temperature, force, mass, power, work, impulse. Answer: Scalar Quantities: speed distance energy electrical charge density volume length time temperature mass power work Vector Quantities velocity acceleration displacement momentum force impulse