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## Chapter 3EQUILIBRIUM AND FRICTION

3.1. Static Equilibrium

3.2. Torques in Equilibrium

3.3. Friction

3.4. Key Concepts and Practice Problems

“This most beautiful system of the sun, planets, and comets could only proceed from the counsel and dominion of an intelligent and powerful Being.”

Attributed to Sir Isaac Newton

### 3.1. Static Equilibrium

• When the net force acting on an object is zero, there is no acceleration, and the object is either moving at a constant velocity or it is at rest. When an object is in motion at constant velocity it is in dynamic equilibrium. When an object is at rest it is in static equilibrium. For an object to be in a state of equilibrium there must be no net forces or torques acting on it. Unless an object is in deep ...

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