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Physics 12
Dynamics Extension – Part I
Learning Outcome (Student will…):
•use vector analysis in two dimensions for systems involving
two or more masses, relative motions, static equilibrium, and
static torques
Two Types of Equilibrium

F  0
1. Translational Equilibrium
2. Rotational Equilibrium
  0
Translational Equilibrium
Definition: Static - not moving
Definition: Translate - to move through space without
rotating
Definition: Translational Equilibrium - the condition where
the vector sum of all forces acting on a body is 0 N or...

F  0
Definition: Statics - the branch of physics that deals with the
calculation of forces acting on bodies which are in
equilibrium
Example: A 150-N weight is supported as shown in
the diagram below. Calculate the tension in each
wire.
Rotational Equilibrium

  F  r sin 
Definition: Torque - the product of the lever (or moment) arm and the applied force
“tau”
force
angle between the
object and the line
along which the force
acts
lever arm or  from the
line along which the
force acts to the point
of rotation
•measured in Nm
•every force on an object contributes a torque!
Definition: Static Equilibrium – a state where an object is in
both translational and rotational equilibrium

F  0
  0