Make a free-body diagram for each of the items that follow: A book is at rest on a. However, the magnitudes of some of the individual forces are. Analyze each situation individually and determine the magnitude of the unknown forces. Free-body diagrams for four situations are shown below. However, the magnitudes of a few of the individual forces are not known. The net force is known for each situation. N is normal to the inclined plane.Ĥ) The force of friction F s exerted by the inclined plane on the box in the direction opposite the motion due to Fa. Free-body diagrams for four situations are shown below. Four forces act on the box:Ģ) The normal force N exerted by the inclined plane on the box. Example 6 : An box on an incline plane with an acting force and friction considered In this example, a force Fa pulls the box upward and frictions are not negligible. So there are four forces acting on the block.Ģ) The normal force N exerted by floor on the block.ģ) The acting force Fa to pull the block.Ĥ) The force of friction F f exerted by floor on the block in the direction opposite the motion due to Fa.Įxample 4 : A falling object In this example, there is only one force action on the falling object.ġ) The weight W exerted by the earth on the falling object.Įxample 5 : An box on an incline plane (with no frictions) In this example, we assume that the inclined plane is frictionless two forces act on the box:ġ) The weight W exerted by the earth on the box.Ģ) The normal force N exerted by the inclined plane on the box. Example 2 : A suspended block In this example, there are two forces acting on the suspended block at rest:ġ) The weight W exerted by the earth on the blockĢ) The tension force T exerted by the string (or rope) on the block.Įxample 3 : A block on a floor with an acting force Fa to pull the block In this example, the block is being pulled and therefore a force of friction acts on the block.
Free body diagrams and net force worksheet free#
You need to first understand all the forces acting on the object and then represent these force by arrows in the direction of the force to be drawn.Įxamples of Free Body Diagrams with Detailed Explanations Example 1 : A book on a table In this example, there are two forces acting on a book at rest on a table:ġ) The weight W exerted by the earth on the bookĢ) The normal force N exerted by the table on the book. It is a diagram including all forces acting on a given object without the other object in the system. The free body diagram helps you understand and solve static and dynamic problem involving forces.
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