2. DEFINITION
Equilibrium results when the forces
acting upon a body are perfectly
balanced and the body remains at rest
or moving with uniform velocity.
3. 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.
5. 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.
6. UNSTABLE 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.
7. 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.
8. 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.
