Forces and Static Equilibrium

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Forging new generations of engineers
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Forces and Static Equilibrium
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Newton's Laws
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.
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Newton's Laws

• If an unbalanced force, F, is applied to a mass,
  m, then the mass will experience an acceleration,
  a.
• F ma

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Newton's Laws

• Every force of action between objects has an
  equal, opposite, and collinear reaction.

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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!
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Newton's Three Laws of Motion

• 2. Right now there is no outside force acting on
  it. Therefore its acceleration is zero.

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Newton's Three Laws of Motion

• 3. The only thing acting on the object here is
  gravity. As the rocks weight pushes down on the
  mountain, the mountain is equally pushing up on
  the rock.

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