What is a scalar? A scalar is a quantity that is fully described by a magnitude only. It is described by just a single number. Some examples of scalar quantities include speed, volume, mass, temperature, power, energy, and time. What is a vector? A vector is a quantity that has both a magnitude and a direction. Vector quantities are important in the study of motion. Some examples of vector quantities include force, velocity, acceleration, displacement, and momentum.
Have all of the relevant physics information you’ll need to solve kinematics, force, energy, and thermodynamics problems at your fingertips with these handy physics equations and constants. Here, you find important physics equations to remember, five useful physical constants, and common moments of inertia equations.