equilibrium.pptx

physioytherapy

1. DEFINITION Equilibrium results when the forces acting upon a body are perfectly balanced and the body remains at rest or moving with uniform velocity.

2. BASE OF SUPPORT Base of support is the area within an object or person point of contact with the ground. The larger / wider the base of support = more stable. Narrow the base of support = less / unstable.

3. TYPES OF EQUILIBRIUM

4. STABLE EQUILIBRIUM It the forces acting upon a body at rest tend to restore it to its original position after it has been displaced, the body is said to be in stable equilibrium. Example: book on a table, chair on the floor.

5. UN STABLE EQUILIBRIUM If a body is given an initial displacement and the forces acting upon it increase this initial displacement however small the latter may be, the body is said to be in unstable equilibrium. Example: pencil standing on its point, toe standing.

6. NEUTRAL EQUILIBRIUM If in spite of displacement of a body, the height and position of its COG remain the same in relation to the base, the body is said to be in neutral equilibrium . Example : rolling a ball.

7. STATE OF EQUILIBRIUM STATIC EQUILIBRIUM: If the combined effect of all the forces acting on a body is zero and the body is in the state of rest then its equilibrium is termed as static equilibrium . Example: all stationary bodies. DYNAMIC EQUILIBRIUM: When a body is in state of uniform motion and the resultant the forces acting upon it is zero then it is said to be in dynamic equilibrium . Example: jump by using parachute.