Why a body Cannot be in equilibrium under the action of a single force?

Since there is a single force acting on the body and no other force to balance it, therefore, it will produce acceleration in the body (in accordance to Newton’s second law of motion) and the body will not be in equilibrium.

Can a couple be balanced by applying a single force if your answer is no then how can it be balanced?

No, only a counter couple balances the couple acting on a body.

Can a force and a couple in the same plane be equivalent to a single force?

A single force and a coplanar couple together acting on a rigid body are equivalent to a single force and also parallel to the given force. So, the correct answer is option C i.e. a single force and parallel to given force.

Why can single force system be in equilibrium?

If there is only one external force (or torque) acting on an object, it cannot be in equilibrium. True, as the sum of forces cannot be zero in this case unless the force itself is zero. If an object is in equilibrium there must be an even number of forces acting on it.

Can a couple of forces keep the body in equilibrium?

A couple CANNOT be put in equilibrium by a single force! A couple can only be put in equilibrium by a moment or another couple of equal magnitude and opposite direction anywhere in the same plane or in a parallel plane.

Is single force can keep the particle in equilibrium?

Correct Option: B. When the resultant of all forces acting on a particle is zero, the particle is in equilibrium. The equilibrium of a particle to which a single force is applied may be maintained by the application of a second force that is equal in magnitude and direction, but opposite in sense, to the first force.

Can a couple can be balanced by a single force?

How does unbalanced forces affect the motion of an object?

An unbalanced force can change an object’s motion. An unbalanced force acting on a still object could make the object start moving. An unbalanced force acting on a moving object could make the object change direction, change speed, or stop moving.

Can a force be balanced by couple and force?

What effect is caused by a couple?

The only effect of a couple is to produce or prevent the turning of a body. The turning effect, or moment, of a couple is measured by the product of the magnitude of either force and the perpendicular distance between the action lines of the forces.

Can single force keep a particle in equilibrium?

Explanation: A body cannot be in the state of equilibrium if only a single force acts on it because we need two or more forces equal in magnitude but opposite in direction to cancel out each other.

What is a force couple system?

In mechanics, a couple is a system of forces with a resultant (a.k.a. net or sum) moment but no resultant force. A better term is force couple or pure moment. Its effect is to create rotation without translation, or more generally without any acceleration of the centre of mass.