http://creatingfreebodydiagrams.wikispaces.com/Creating+Free-Body+Diagrams
Look at picture number two
The picture above shows a good example of a free body diagram. The object is a person on a motorcycle and it is moving by force friction. One of the forces being show in this diagram is gravitational force. Gravity is pushing down on the motorcycle and person in order for both objects to stay on the ground. Another force being shown is normal force. The motorcycle and the person are on a surface, which is the ground. Normal force is pushing up. Opposite from a gravitational force. The last force being displayed in the diagram is friction force. The wheels on the motorcycle is what is making the motorcycle move. The friction is happening between the ground and the wheels.
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