![]() ![]() It is always perpendicular to the surface with which an object is in contact. The normal force is one which prevents objects from 'falling' into whatever it is they are sitting upon. This 'weight' ( \(mg\)) is different from our everyday use of the word 'weight' (which is known in physics as 'mass'). Note also that this force is commonly called “weight”. Note that the force vector, labelled \(F_g\), points downward, as this is the direction in which the gravitation force acts. ![]() Where \(g\) is the acceleration due to gravity and m is the mass of the carriage. We know that the acceleration due to gravity (if on Earth) is approximately \(g = 9.8 m/s^2\). The first force we will investigate is that due to gravity, and we'll call it the gravitational force. ![]() In this tutorial, we will review some of the main forces which you will encounter in physics, and discuss their contribution to an FBD. First we will represent the sled (the 'body' in our problem) as a (really) simplified figure, a square resting on a flat surface. Let's take this figure to be a pictorial representation of our problem: a sled on snow, with horses pulling it. This eliminates unnecessary information which might be given in a problem. This body is free because the diagram will show it without its surroundings i.e. Free body diagrams (otherwise known as FBD's) are simplified representations in a problem of an object (the body), and the force vectors acting on it. ![]()
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