1. Physics 12

3. 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

4. Two Types of Equilibrium
1. Translational Equilibrium
2. Rotational Equilibrium

5. 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...
Definition: Statics - the branch of physics that deals with the calculation of forces acting on bodies which are in equilibrium

6. Example: A 150-N weight is supported as shown in the diagram below
Example: A 150-N weight is supported as shown in the diagram below. Calculate the tension in each wire.

7. Rotational Equilibrium
Definition: Torque - the product of the lever (or moment) arm and the applied force
angle between the object and the line along which the force acts
“tau”
lever arm or  from the line along which the force acts to the point of rotation
force
measured in Nm
every force on an object contributes a torque!

8. Definition: Static Equilibrium – a state where an object is in both translational and rotational equilibrium