Table of Contents

- 1 Can a body rotates about its center of gravity?
- 2 Why does a body rotate about Centre of mass?
- 3 What is the role of Centre of gravity?
- 4 What is the difference between the center of mass and the center of gravity?
- 5 Do all celestial bodies rotate?
- 6 What happens to the center of gravity of an object?
- 7 Is the axis of rotation and center of gravity true?

## Can a body rotates about its center of gravity?

The center of gravity of an object is the point you can suspend the object from without there being any rotation because of the force of gravity, no matter how the object is oriented. The center of mass of an object is generally the same as its center of gravity.

## Why does a body rotate about Centre of mass?

Why does this happen? It’s because the axle is forcing the wheel to rotate around a point that is not its center of mass. In other words, only rotation around the center of mass is neutral; in order for an object to rotate around another point, another force is required to keep it in place.

**Is the center of gravity the axis of rotation?**

The center of gravity is exactly the same as the center of mass. Moment of inertia depends not only on the mass of an object, but also its distribution: material far from the axis of rotation adds more rotational inertia than material close to the axis.

**Why do bodies rotate?**

Our planets have continued spinning because of inertia. In the vacuum of space, spinning objects maintain their momentum and direction — their spin — because no external forces have been applied to stop them. And so, the world — and the rest of the planets in our solar system — keeps spinning.

### What is the role of Centre of gravity?

The center of gravity of an object is where we can consider all of the weight of the object to be concentrated. This is a useful concept in physics and engineering. It is used to determine the stability of objects when they are tilted.

### What is the difference between the center of mass and the center of gravity?

The center of mass is the mean position of the mass in an object. Then there’s the center of gravity, which is the point where gravity appears to act. For many objects, these two points are in exactly the same place. But they’re only the same when the gravitational field is uniform across an object.

**Is axis of rotation same as center of mass?**

Purely rotational motion occurs if every particle in the body moves in a circle about a single line. This line is called the axis of rotation. There remains the matter of describing the rotation of the body about the center of mass and relating it to the external forces acting on the body.

**Does the center of mass rotate?**

The interesting thing about the center of mass of an object or system is that it is the point where any uniform force on the object acts. If we push on a rigid object at its center of mass, then the object will always move as if it is a point mass. It will not rotate about any axis, regardless of its actual shape.

#### Do all celestial bodies rotate?

The planets all revolve around the sun in the same direction and in virtually the same plane. In addition, they all rotate in the same general direction, with the exceptions of Venus and Uranus. These differences are believed to stem from collisions that occurred late in the planets’ formation.

#### What happens to the center of gravity of an object?

Fact 1 – An object thrown through the air may spin and rotate, but its center of gravity will follow a smooth parabolic path, just like a ball. Fact 2 – If you tilt an object, it will fall over only when the center of gravity lies outside the supporting base of the object.

**How does the force of gravity work on your body?**

Actually, the force of gravity acts on all of your mass in the same way, according to down to every single molecule and atom. If we break up your body into many many small chunks of equal mass we could calculate the tiny force of gravity on each one.

**Can a top spin through its center of gravity?**

A ‘torque’ can be offset from the center of mass, and impart rotation. A top can spin about the axis through its center of mass, but it might be at an angle to the vertical, so it isn’t spinning through its center of gravity.

## Is the axis of rotation and center of gravity true?

What is true is the (mathematical) fact that, when you refer the motion to the centre of mass, the eqs. of motion adopt a particularly simple way in terms of the moments of inertia relative to the principal axes. They kind of split in to translation and rotation in a simple way. Maybe it’s true. But then again, I would have to think about it.