Welcome to this deck on Forces and Motion, a key topic in AQA GCSE Physics. We will explore the fundamental concepts that describe how and why things move. You'll learn the crucial difference between scalar and vector quantities, like distance and displacement, and speed and velocity. We'll also cover different types of forces, the distinction between mass and weight, and how to calculate the overall effect of multiple forces acting on an object.

In physics, we use quantities to describe the world around us. These quantities fall into two categories: scalar and vector. A scalar quantity has only a magnitude, which is just another word for size or amount. For example, a speed of 30 miles per hour is a scalar. A vector quantity has both a magnitude and a specific direction. For example, a velocity of 30 miles per hour due north is a vector. The direction is just as important as the size.

Let's apply this to motion. Distance and displacement are two terms that seem similar but have very different meanings in physics. Distance is a scalar quantity. It tells you the total ground you have covered, regardless of your route. If you run a 400 metre lap on a running track, the distance you've covered is 400 metres. Displacement, however, is a vector. It measures your overall change in position from your start point to your end point, in a straight line. So, after that 400 metre lap, because you end up exactly where you started, your displacement is zero.