Key Terms and Conepts
- Define center of gravity, support base, and normal force.
- Compare the relative torque applied to objects by various forces.
- State the conditions for static equilibrium.
- Compare and contrast stable, unstable, and metastable equilibrium.
- Apply center of gravity, support base, and metastable equilibrium concepts to compare the stability of various structures.
a point at which the force of gravity on body or system (weight) may be considered to act. In uniform gravity it is the same as the center of mass.
the outward force supplied by an object in response to being compressed from opposite directions, typically in reference to solid objects.
the result of a force applied to an object in such a way that the object would change its rotational speed, except when the torque is balanced by other torques
a state of having not net torque and no change in rotational motion
a state in which a body tends to return to its original position after being disturbed
a state of equilibrium such that when the body is slightly displaced it departs further from the original position
a state in which a slight disturbance results in a restoring force that maintains stability, but a sufficiently large disturbance moves the system into an unstable region (or different metastable region)
a measure of the displacement from equilibrium an object can experience and still move back toward equilibrium