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# free body diagram

 Definition/Summary A free-body diagram is a diagram of all the contact and non-contact forces acting directly on a body (in a non-inertial frame, that includes "fictitious" forces). Indirect forces (such as the weight of a different body), and internal forces, should not be shown. Centripetal force should not be shown (see below). When a body is made of smaller bodies, many free body diagrams may be drawn. A free-body diagram is used as a visual tool to help solve static and dynamic problems. Rules for drawing and using one are outlined below.

 Equations Newton's Second Law: $$\sum\vec{F}=m\vec{a}$$ Newton's Second Law for Torque: $$\sum\vec{\tau}=\sum\vec{r}\times\vec{F}=I\vec{\alpha}$$

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 Breakdown Physics > Classical Mechanics >> Newtonian Dynamics