Description of motion
The world consists of mass (m), space (l) and time (t), whose units are kg, m and s respectively in the International System (SI).
Scientific Notation
2.3 x 10-3,
Scalars
Scalars are the quantities with no associated direction, normally used to describe objects and situations, such as mass (5 kg), length (3.4 m), time (30 s), temperature (20 C),
Vectors
Vectors are the quantities defined by both magnitude and direction, normally used to describe actions, such as displacement (move to right 3 m), velocity (20 m s-1 to east), acceleration, force (20N forward), momentum, and impulse.
adding vectors in one and two dimensions
Subtracting vectors in one and two dimensions
Vector components
Fig. The vector (20 N) resolved into a horizontal component Fh and a vertical component Fv.
Algebraic representation of vector addition and subtraction