define mass?

Question

defination used in physics.

Answer 1

Mass is the amount of matter that a body contains, and a measure of the inertial property of that body, that is, of its resistance to change of motion (Inertia). Mass is different from weight, which is a measure of the attraction of the earth for a given mass (Gravitation). Inertial mass and gravitational mass are identical. Weight, although proportional to mass, varies with the position of a given mass relative to the earth; thus, equal masses at the same location in a gravitational field will have equal weights. A mass in interstellar space may have nearly zero weight. A fundamental principle of classical physics is the law of conservation of mass, which states that matter cannot be created or destroyed. This law holds true in chemical reactions but is modified in cases where atoms disintegrate and matter is converted to energy or energy is converted to matter

Answer 2

Define Mass

Answer 3

Mass is a property of a physical object that quantifies the amount of matter and energy it is equivalent to. Unlike weight, the mass of something at rest stays the same regardless of location. Mass is a central concept of classical mechanics and related subjects, and there are several forms of mass within the framework of relativistic kinematics (see mass in special relativity and mass in General Relativity). In the theory of relativity, the quantity invariant mass, which in concept is close to the classical idea of mass, does not vary between single observers in different reference frames.

There are three types of mass or properties called mass:

* Inertial mass is a measure of an object's resistance to changing its state of motion when a force is applied. An object with small inertial mass changes its motion more readily, and an object with large inertial mass does so less readily.
* Passive gravitational mass is a measure of the strength of an object's interaction with the gravitational field. Within the same gravitational field, an object with a smaller passive gravitational mass experiences a smaller force than an object with a larger passive gravitational mass. (This force is called the weight of the object. In informal usage, the word "weight" is often used synonymously with "mass", because the strength of the gravitational field is roughly constant everywhere on the surface of the Earth. In physics, the two terms are distinct: an object will have a larger weight if it is placed in a stronger gravitational field, but its passive gravitational mass remains unchanged.)
* Active gravitational mass is a measure of the strength of the gravitational field due to a particular object. For example, the gravitational field that one experiences on the Moon is weaker than that of the Earth because the Moon has less active gravitational mass.
* Although inertial mass, passive gravitational mass and active gravitational mass are conceptually distinct, no experiment has ever unambiguously demonstrated any difference between them.

Answer 4

We use the word mass to talk about how much matter there is in something. (Matter is anything you can touch physically.) On Earth, we weigh things to figure out how much mass there is. The more matter there is, the more something will weigh. Often, the amount of mass something has is related to its size, but not always. A balloon blown up bigger than your head will still have less matter inside it than your head (for most people, anyhow) and therefore less mass.

The difference between mass and weight is that weight is determined by how much something is pulled by gravity. If we are comparing two different things to each other on Earth, they are pulled the same by gravity and so the one with more mass weighs more. But in space, where the pull of gravity is very small, something can have almost no weight. It still has matter in it, though, so it still has mass.

Answer 5

Mass
From Wikipedia, the free encyclopedia

Mass is a property of a physical object that quantifies the amount of matter and energy it is equivalent to. Unlike weight, the mass of something at rest stays the same regardless of location. Mass is a central concept of classical mechanics and related subjects, and there are several forms of mass within the framework of relativistic kinematics (see mass in special relativity and mass in General Relativity). In the theory of relativity, the quantity invariant mass, which in concept is close to the classical idea of mass, does not vary between single observers in different reference frames.

There are three types of mass or properties called mass:

Inertial mass is a measure of an object's resistance to changing its state of motion when a force is applied. An object with small inertial mass changes its motion more readily, and an object with large inertial mass does so less readily.

Passive gravitational mass is a measure of the strength of an object's interaction with the gravitational field. Within the same gravitational field, an object with a smaller passive gravitational mass experiences a smaller force than an object with a larger passive gravitational mass. (This force is called the weight of the object. In informal usage, the word "weight" is often used synonymously with "mass", because the strength of the gravitational field is roughly constant everywhere on the surface of the Earth. In physics, the two terms are distinct: an object will have a larger weight if it is placed in a stronger gravitational field, but its passive gravitational mass remains unchanged.)

Active gravitational mass is a measure of the strength of the gravitational field due to a particular object. For example, the gravitational field that one experiences on the Moon is weaker than that of the Earth because the Moon has less active gravitational mass.

Although inertial mass, passive gravitational mass and active gravitational mass are conceptually distinct, no experiment has ever unambiguously demonstrated any difference between them.

Answer 6

Mass is a measure of Inertia.The greater the mass the higher is force required to cause motion from a static position.

Answer 7

The classic definition of mass, that it is the amount of matter, is simply going in circles, since matter is something with mass. (We keep going round and round)

In physics, the basic definition of mass is simply the measure of inertia a particle (or particles) possesses. Then Newton defined another concept of mass, that it is the quantity that gives something a gravitational pull and, in turn, gets pulled by another mass' gravitation.

Answer 8

the amount of gravitational force that acts on a body.
For example,your mass on Earth may be,say 35 to 40 kilomrams.The same,if you try on Jupiter,it may be more than 100Kgs.This is because the gravitational force of Jupiter is 700 times to that of Earth's.Hope my defnition is proven!

Answer 9

mass is the amount of matter packed into a body. That is why density is defined as the amount of matter packed into unit volume of a body.

Answer 10

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