1. Pythagoras

2. 1.3 Vectors and scalars A scalar quantity has size only
e.g. mass, energy, speed, distance
A vector quantity has both size and direction
e.g. force, acceleration, velocity, displacement
Graphical addition of vectors:
Place the vectors end-to-end, the sum is the vector from the beginning of the first to the end of the last
Mathematical addition of vectors:
Split all vectors in components along the x- and y-axes
Add the x- and y-components separately
Construct the sum vector from the summed components

3. Example: A person walks 2 km North and then 1. 5 km North-East
Example: A person walks 2 km North and then 1.5 km North-East. Find the displacement.
By graphical addition
By mathematical addition

4. Answer 15, 16, 17, 18, 21 on p