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Scalar Quantity
a quantity that is described by a magnitude (or numerical value) alone
Vector quantity
a quantity that is fully described by both magnitude and direction
Scalar quantity:
Time
Mass
Length
Distance
Speed
Power
Energy
Work
Vector quantity
Displacement
Velocity
Acceleration
Force
Weight
Friction
Impulse
Momentum
Scalar
25 km, which shows distance
Scalar
100 kg, which describes a mass
Vector
200 Newton upward, which describes a force of 200 N directed upward
Vector
25 km/h East, which tells the velocity of a vehicle (the magnitude is 25 km/hr and direction is East)
Scalar quantities follow ordinary arithmetic rules when being added while vector quantities do not.
This is one characteristic of vector quantity that made it important in the study of physics.