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Free-Body Diagrams. Understanding forces. Definition. A free-body diagram is a simple diagram that shows the size and direction of all the forces acting on an object. Example. F Normal. F Applied. F Friction. p. F Gravity. Strategies for Constructing a Free-Body Diagram.

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## Free-Body Diagrams

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**Free-Body Diagrams**Understanding forces**Definition**A free-body diagram is a simple diagram that shows the size and direction of all the forces acting on an object**Example**FNormal FApplied FFriction p FGravity**Steps for Constructing a Free-Body Diagram**• Draw the object as a box • Draw each force as an arrow • Attach each arrow to the box • Aim the tip of each arrow in the direction the force is acting • Label each arrow**Lets Try Some Examples**• A radio sits on a bookshelf. Observe the forces acting on the radio**Example 1**• Remember • Read the Problem • Determine all the forces that are acting on the object • Determine the direction that each force is acting**Example 1**• Remember • The force of gravity acts on the radio • The direction is downward • The force of the bookshelf holds up the radio • The direction is upward**The Free-Body Diagram**The Free-Body Diagram will look like this FNormal FGravity**Example 2**• A car traveling down a road. Observe the forces acting on the car.**Example 2**• The force of gravity acts on the car downward • The force of the road holds the car upward • The force of the engine moves the car forward • The Friction against the wheels and the road pull backwards**The Free-Body Diagram**The Free-Body Diagram will look like this FNormal FFriction FEngine FGravity**For You To Do**Finish the worksheet in groups. Remember the strategies and steps for constructing a free-body diagram

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