Dynamic

Nota:

• Relation Between motion and Forces

1. Forces
   1. Contact Forces
      1. Normal
      2. Friction
      3. Tension
   2. Longe Range Forces
      1. Gravitational
   3. Resultant Force
      1. Vector Sum of Forces ∑Fx=Rx y ∑Fy=Ry
         1. R=√(Rx)^2+(Ry)^2
2. Newton's First Law

   Nota:

   • An object at rest stays at rest and an object in motion stays in motion with the same speed and in the same direction unless acted upon by an unbalanced force.
   1. Conditions ∑F=0 => Equilibrium

      Nota:

      • free particle: not subject to any interaction
      1. Rest

         Nota:

         • a=0 vo=0 ∑F=0
      2. Constant motion

         Nota:

         • a=0 Vo>0 ∑F=0
3. Newton's Second Law

   Nota:

   • Acceleration is produced when a force acts on a mass. The greater the mass (of the object being accelerated) the greater the amount of force needed (to accelerate the object).
   1. ∑F=m*a

      Nota:

      • m=constant
4. Newton's Third Law

   Nota:

   • For every action, there is an equal and opposite reaction.
   1. F a->b = - Fb->a
   2. acts on different bodies