Week 7: Static Equilibrium

Static and Dynamic Equilibrium

Equilibrium implies the object is at rest or its center of mass moves with a constant velocity.

Static Equilibrium

We will consider only with the case in which linear and angular velocities are equal to zero.

First Condition of Equilibrium: Translational Equilibrium

• It states that the translational acceleration of the object’s center of mass must be zero.

• The net external force on the object must equal zer

Torque

• An action that causes objects to rotate. It is not the same thing as force.

• The measure of the tendency of the force to cause an object to turn or rotate.

• For rotational motion, the torque is what is most directly related to the motion, not the force

Second Condition of Equilibrium: Rotational Equilibrium

• When an object is in this equilibrium, the net torque applied to it is zero.

• It is is often used to determine unknown forces.