Vectors and Scalars

We deal with many quantities in science. We can classify them as Vectors and Scalars.

What's the difference?

A Vector quantity has magnitude and direction whilst a scalar just has direction. For example a force will act in a certain direction but a mass can't, so force is a vector and mass is a scalar.

Also, vectors can be represented diagrammatically with arrows. The Direction and size of the arrow can give us information about the vector on a scale drawing. If a vector quantity in one direction is positive then one in the opposite direction is negative. Vectors in the same direction can be added and subtracted.

Here are some examples:

The weight of the parachutist and the upward drag force are equal so he falls with a steady speed.	When the plane flies into a headwind its speed is reduced by the speed of the wind. With a tailwind the plane flies faster.
The acceleration of the space shuttle at take off is less by 10m/s2 due to gravity	If your putt is short of the hole you need to putt some more (top tip)