how can a object move under the action of balanced forces
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No , beacuse if then there is a euallibrium between them and there no one produce effect and net force on the object is 0 and as we know if there not any external force applied no own its own motion and its continue its position of rest or vice versa .
QGP:
@AionAbhishek , you considered only static equilibrium. Please correct your answer.
ohk
hello its right i think
because as we know that only unbalanced alter the state so my answer is also is maybe not conaidered wrong cause if that body is at rest then its continue its state and if it in motion then continue its motion
but according to this question there is just a simple answer . Consider a body in motion and apply balaned force on it then it continue its motion and not come to rest or change its velocity .
Yes, your last comment is correct
In your second last comment, and in your answer, you took it for granted that the body in question was already at rest
cause = F=0 = m dv /dt and then dv = change in velocity is zero it means the body is moving with same velocity in balanced force case .
Yes, correct
Answered by
2
The answer is Yes. A body can move under the effect of balanced forces.
Here's how:
The basis is Newton's First and Second Laws of Motion.
The first law states that a body which is stationary, will remain stationary; and a body which is in motion, will continue to move with constant velocity until any net unbalanced force acts on it.
This means that a body doesn't require any force to be in motion. The actual purpose of force is to bring a change in state of body (stationary state or state of motion)
The second law states that:
The rate of change of momentum is directly proportional to the net resultant force acting on it, and it is in the direction of the force.
This means that F = ∆P/∆t
Thus, force is equal to change in momentum per unit time.
(The well known expression F = ma is just a special case of the second law, valid only under some circumstances. The equation F = ∆P/∆t is valid everywhere)
So, if a body is already in motion, then any unbalanced force can change its velocity. But if balanced forces are acting on the body, it means that the net force acting on the body is zero.
As a result, change in momentum is zero. So, body continues to move with constant velocity.
This is a condition of equilibrium, as the net force is zero. But as the body is moving, this is called a Dynamic Equilibrium.
(If the body was stationary under the effect of balanced forces, then the equilibrium is known as Static Equilibrium).
Here's how:
The basis is Newton's First and Second Laws of Motion.
The first law states that a body which is stationary, will remain stationary; and a body which is in motion, will continue to move with constant velocity until any net unbalanced force acts on it.
This means that a body doesn't require any force to be in motion. The actual purpose of force is to bring a change in state of body (stationary state or state of motion)
The second law states that:
The rate of change of momentum is directly proportional to the net resultant force acting on it, and it is in the direction of the force.
This means that F = ∆P/∆t
Thus, force is equal to change in momentum per unit time.
(The well known expression F = ma is just a special case of the second law, valid only under some circumstances. The equation F = ∆P/∆t is valid everywhere)
So, if a body is already in motion, then any unbalanced force can change its velocity. But if balanced forces are acting on the body, it means that the net force acting on the body is zero.
As a result, change in momentum is zero. So, body continues to move with constant velocity.
This is a condition of equilibrium, as the net force is zero. But as the body is moving, this is called a Dynamic Equilibrium.
(If the body was stationary under the effect of balanced forces, then the equilibrium is known as Static Equilibrium).
Please wait till I'm finished
Other example: ∆P = Change in momentum = Final momentum - Initial momentum
Thus, you can say that ∆ denotes 'difference of final value and initial value'
Now, I'm explaining equilibrium in the lines that follow:
Equilibrium basically means a stable position. Consider a pendulum of a clock. It moves to and fro about a central point. This central position is called its Equilibrium
But in this answer, the meaning of equilibrium is slightly different
Static Equilibrium means that the body stays at rest (the fixed position) . This position is called its Equilibrium position
Dynamic equilibrium is different. Here the constant state is its state of motion. Thus, the body moves with only constant velocity. Here, there is no fixed position, but as the net force on it is zero, it is said to be in equilibrium
You can take one condition for Equilibrium: whenever resultant force acting on a body is zero, the body is said to be in equilibrium
I have finished. If you have any doubts, feel free to ask
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