Forces and Static Equilibrium

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Presentation transcript:

Forces and Static Equilibrium Principles of EngineeringTM Lesson 5.1 - Statics Forging new generations of engineers Project Lead The Way, Inc. Copyright 2007

Forces and Static Equilibrium

Newton's Laws Sir Isaac Newton When an object is at rest or moving with a constant velocity, it will stay at rest or moving with a constant velocity until is is subjected to an unbalanced force.

Newton's Laws Sir Isaac Newton If an unbalanced force, F, is applied to a mass, m, then the mass will experience an acceleration, a. F = ma

Newton's Laws Sir Isaac Newton Every force of action between objects has an equal, opposite, and collinear reaction.

Newton's Three Laws of Motion 1. This rock is at rest. It will stay at rest unless something really big tries to force it off!

Newton's Three Laws of Motion 2. Right now there is no outside force acting on it. Therefore it’s acceleration is zero.

Newton's Three Laws of Motion 3. The only thing acting on the object here is gravity. As the rock’s weight pushes down on the mountain, the mountain is equally pushing up on the rock.

Static Equilibrium Static Equilibrium is the state of an object when it is at rest or moving with a constant velocity. There may be several forces acting on the object. If they are canceling each other out and the object is not accelerating, then it is in a state of static equilibrium.

Static Equilibrium The forces here are canceling each other out. It is in a state of static equilibrium.