Scalars and vectors
• Physical quantities can be classified into two categories: scalars and vectors.
• Scalars:
• These are quantities that have magnitude only (no direction).
• Example: mass, distance, time, speed, temperature, volume,...
• Vectors:
• These are quantities that have both magnitude and direction.
• Example: Displacement, velocity, acceleration, force, …
❖ Vector operations
• Vectors are represented by arrows.
• The length of the arrow is proportional to the magnitude of the vector.
• Vectors can be added/subtracted graphically or by components.
❖ Graphical method
Example 1
SI units and measurements Page 1
Example 2
SI units and measurements Page 2
SI units and measurements Page 3