Drawing Free Body Diagrams Answer Key
Activity 10
Free-Body Diagrams
Objective: To draw free-body diagrams allowing us to isolate an object from its environment and
identify forces acting only on it. An application of Newton's 2nd Law.
Activity 10.1. Free-Body Diagram Practice
Free-body diagrams allow us to separate an object from a system of interacting objects to
analyze the forces on it. Use the following procedure to draw free-body diagrams:
1. Draw a dot, small circle, or small square to symbolize the object you want to analyze. The
shape of the object itself doesn't matter, so make sure that the drawing is small and
simple. We are only interested in the motion of the center of mass of the object.
2. Identify all the forces exerted on the object. Don't forget the gravitational force and
contact forces.
3. List, not draw, all of the items in the object's environment that exert forces on the object.
Drawing other items will only confuse the forces exerted on the object with those exerted
by it.
4. Draw an arrow to represent each force. The tail of the arrow should be located on the
simple object, and the arrow should point in the direction the force is exerted. The arrows
should be drawn to the correct relative lengths (if you know one force is three times as big
as another, the arrow for that force should be three times as long).
5. Label the force arrows by the following convention:
𝐹
𝑏𝑦,𝑜𝑛
𝑡𝑦𝑝𝑒
"Type" identifies what kind of force it is. We will name forces based on what we know
about the force. "On" identifies the object subjected to the force, that is, the object
represented by the circle in step 1. Any forces which are "on" any object except the one
we are interested in, do not belong in the free-body diagram.
6. Verify that your forces are exerted on , not by, the object.
7. Draw a small arrow next to the object to represent acceleration. Label this arrow " 𝑎 ".
Check that the vector sum of the force vectors points in the direction of this acceleration.
If the object is in equilibrium, write "𝑎 = 0" and make sure the vector sum is zero as well.
If your forces don't add up for the given acceleration, make sure you drew the right forces
and that they are to scale.
Drawing Free Body Diagrams Answer Key
Source: https://www.studocu.com/en-us/document/university-of-arkansas/university-physics-ii/lab-10-free-body-diagrams/11533003
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