Pythagoras

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

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

Answer 15, 16, 17, 18, 21 on p. 26-28