If you want to understand how any object moves or motion of object,
for example a car on the freeway, a soccer ball being kicked towards the goal or your dog chasing
the neighbour’s cat, then you have to understand three basic ideas about what it means when
something is moving. These three ideas describe different parts of exactly how an object moves.
1. position or displacement which tells us exactly where the object is,
2. speed or velocity which tells us exactly how fast the object’s position is changing or more
familiarly, how fast the object is moving, and
3. acceleration which tells us exactly how fast the object’s velocity is changing.