# Can an object be stationary and in equilibrium?

## Can an object be stationary and in equilibrium?

If an object is at rest and is in a state of equilibrium, then we would say that the object is at “static equilibrium.” “Static” means stationary or at rest. The state of the object is analyzed in terms of the forces acting upon the object.

Are objects always motionless at equilibrium?

A system is in equilibrium if the translational(straight line) velocity of its center of mass and angular (rotational) velocities of all its parts are constant, moving and rotating at constant velocity, with no acceleration. Equilibrium does not mean motionless, it means constant velocity=No acceleration.

How could an object be in equilibrium but still be moving?

As long as there is an equal force to counter the force of the motion, the object is stated to be in equilibrium. This would translate to the object moving in a straight line at a constant speed. The object would be moving and still in equilibrium.

### What are the 2 ways that an object can be in equilibrium?

Conditions for equilibrium require that the sum of all external forces acting on the body is zero (first condition of equilibrium), and the sum of all external torques from external forces is zero (second condition of equilibrium). These two conditions must be simultaneously satisfied in equilibrium.

What are the three conditions of equilibrium?

A solid body submitted to three forces whose lines of action are not parallel is in equilibrium if the three following conditions apply :

• The lines of action are coplanar (in the same plane)
• The lines of action are convergent (they cross at the same point)
• The vector sum of these forces is equal to the zero vector.

What is an example of an object in equilibrium?

An example of an object in equilibrium is a rod that is free to rotate about a hinge at one end. It is held horizontally, with the torque due to the force of gravity being balanced by the torque from a force with a vertical component applied at some point along the rod.

## What is the first condition of equilibrium?

The first condition of equilibrium is that the net force in all directions must be zero.

What are the 3 types of equilibrium?

There are three types of equilibrium: stable, unstable, and neutral. Figures throughout this module illustrate various examples.

What is equilibrium and its conditions?

An object is in equilibrium in a reference coordinate system when all external forces (including moments) acting on it are balanced. According to Newton’s first law, under the equilibrium condition, an object that is at rest will stay at rest or an object that is in motion will not change its velocity.

### What is an example of equilibrium?

An example of equilibrium is in economics when supply and demand are equal. An example of equilibrium is when you are calm and steady. An example of equilibrium is when hot air and cold air are entering the room at the same time so that the overall temperature of the room does not change at all.

What are the examples of stable equilibrium?

A book lying on a horizontal surface is an example of stable equilibrium. If the book is lifted from one edge and then allowed to fall, it will come back to its original position. Other examples of stable equilibrium are bodies lying on the floor such as chair, table etc.

What is equilibrium and example?

Equilibrium is defined as a state of balance or a stable situation where opposing forces cancel each other out and where no changes are occurring. An example of equilibrium is when hot air and cold air are entering the room at the same time so that the overall temperature of the room does not change at all.

## What are the two conditions for an object to be in equilibrium?

There are two conditions that must be met for an object to be in equilibrium. The first condition is that the net force on the object must be zero for the object to be in equilibrium. If net force is zero, then net force along any direction is zero. Key Terms

What happens to the torque of an object in equilibrium?

In equilibrium, the net force and torque in any particular direction equal zero. In equilibrium, the net force in all directions is zero. If the net moment of inertia about an axis is zero, the object will have no rotational acceleration about the axis.

What does it mean when an object is in static equilibrium?

An object in static equilibrium is one that has no acceleration in any direction. While there might be motion, such motion is constant. Two children on a seesaw: The system is in static equilibrium, showing no acceleration in any direction. If a given object is in static equilibrium, both the net force and the net torque on the object must be zero.

### What happens when an object has a constant velocity?

An object with constant velocity has zero acceleration. A motionless object still has constant (zero) velocity, so motionless objects also have zero acceleration. Newton’s second law states that: so objects with constant velocity also have zero net external force.