PX155 - A4 - scalars and vectors

scalar

• has magnitude but no direction
• can be positive or negative
• eg: mass, time, speed

vector

• has magnitude and direction
• eg: $\overrightarrow{v},\overrightarrow{p},\overrightarrow{a},\overrightarrow{F}$
• in vector form:

- $r=\frac{2}{\overrightarrow{v}}$ x
- $m+\overrightarrow{v}=\overrightarrow{p}$ x
- vector cannot equal scalars