Vectors, Scalars and Basic Motion
Vectors are quantities that need both size and direction to make sense - like when you tell someone to walk 5 metres north. Scalars only need a size - like saying you weigh 60 kg.
Think of it this way: if you're giving directions, you need vectors (displacement, velocity, acceleration). If you're just measuring something, you usually need scalars (distance, speed, mass, energy).
The most basic motion equation you'll use constantly is the speed triangle: Speed = Distance ÷ Time. You can rearrange this to find any missing value. For average speed, just divide the total distance by the total time taken - simple as that!
Quick Tip: Cover up the value you want to find in the triangle, and the remaining two show you the calculation!
