What is the difference between static equilibrium and dynamic equilibrium?

Question

I know that dynamic equilibrium includes inertial forces unlike static equilibrium. But... then what else differentiates them?

Answer 1

Static equilibrium is when all forces acting on an object are balanced (i.e. there is no resultant forces) and the object is not in motion releative to the plane of reference, in otherwords the object does not have a velocity.

Dynamic equilibrium is when all the forces acting on an object are balanced but the object it moving, it has a velocity.

Answer 2

Suppose there is a branch of a tree which can support 100 birds at a time.

The branch is in static equilibrium when there are 100 birds on it.


Imagine a situation when there are 100 birds on the branch of the tree and there many on other trees.

If some birds fly out of the branch and same number of birds come to this branch from other trees.

Let us assume that the process takes continuously


Thus at any instant of time there will be 100 birds on this branch, and the branch will not broken and it will be in equilibrium.

The former is static equilibrium where as the second is dynamic equilibrium.


Consider a vessel half full of water and there is an outlet to take away the water if it exceeds half the volume.

The pressure at the bottom of the vessel is due to the height of water over it.

Suppose water is added to the vessel from a pipe and the out flow is adjusted such that it is equal to the inflow of water.

Though the water is not static, the level of water will always the same and hence the pressure is in static equilibrium.

Answer 3

Static Equilibrium: ~All components within the system are at zero velocity (they are at rest and are not accelerating) ~Sum of forces equals zero ~Sum of moments equals zero Dynamic Equilibrium ~All components within the system are at constant velocity (they are not accelerating) ~Sum of forces equals zero ~Sum of moments equals zero For dynamic eq, the acceleration is zero. For static eq, both the acceleration and velocity are zero. That's it, really.

Answer 4

STATIC EQUILIBIRIUM
1)The body is sad to be in static equilibirium when the body is at rest.
2)the velocity of body is 0
3)for ex:a book laying on a table.
DAYNAMIC EQUILIBIRIUM
1)The body is sad to be DAYNAMIC equilibirium when the body is moving with constant velocity.
2)the velocity is constant.
3)for ex:jumping by using parashoot.

Answer 5

Static means not moving.

Dynamic means moving.

Equilibrium means in balance.

Answer 6

during static equil {
wrt to a non accl (any form of accln)
pt mostly the grnd } "nothing" happens
a} there is no angular and translational VELOCITY.
dynamic equil
B} there is no angular and translational ACCLN.