What is the mass of an object? What does that mean?

1.Inertial mass is cited in Newton's three theorems2Gravitational mass in Newton's gravitational theorem 3

Energy mass Citations in Einstein's mass-energy equation e=mc24Quantum Force Differential Component I've read this in a book, but I don't know it specifically: Gravitational mass refers to the scale coefficient of gravitational force f=gmm r 2, and inertial mass refers to the amount of quotation in Newton's theorem of motion: f=ma (particle) or i=mr 2 (rigid body).

Mass is a property of the object itself, which is only related to the amount of matter contained in the object, and has nothing to do with the shape, state, and position of the object. Mass is a fundamental concept in physics, and its meaning and content continue to be clarified and enriched with the development of science.

Mass is divided into inertial mass and gravitational mass. Any matter in nature has both inertial and gravitational mass. The term "matter" here is a general term for macroscopic objects and electromagnetic fields, celestial bodies and galaxies, and elementary particles of the microscopic world in nature.

Mass is a fundamental concept in physics, and its meaning and content continue to be clarified and enriched with the development of science. Originally, Newton spoke of mass as the quantity of matter, that is, a measure of how much matter there is.

In Newtonian mechanics, a given object has a certain inertial mass (denoted by letters), which appears as a constant independent of time and space position in the second law of Newtonian mechanics: f = ma (the magnitude of the acceleration of the object a is proportional to the magnitude of the force f applied, and the scale factor m is called the inertial mass of the object). Inertial mass is a measure of the inertia of an object:

For an object larger than m, the more difficult it is to change its state of motion (velocity). In Newtonian mechanics, no object exists with an inertial mass equal to zero.

In the special theory of relativity, inertial mass is further subdivided into static mass, dynamic mass, and relativistic mass (total mass). The difference between relativistic mass and static mass is called moving mass.

Idea: Gravity workmanship is equal to the increment of the kinetic energy of the chain plus friction workmanship.

i.e., mg(l-a)1 2mv umg(l-a).

Since the chain only comes into contact with the table during the fall, UMG can be used directly in the calculation of friction.

Moving the distance dx, the work done by the frictional force is: dw=fdx.

i.e. dw=(umg l)· (l-a-x)dx。

w=umg/l · l-a-x)dx。

Points from 0 to l-a, get.

w=umg(l-a)²/2l。

The concept of quality is proposed.

A long time ago, when people were studying the inertial motion of objects, Cha Fengsen had broken the relationship between external causes and motion changes when breaking inertial motion. Epicurus thinks:

The occurrence of the phenomenon of speed and slowness depends on whether the imaginary mu collides with each other. The change in the direction and velocity of the atoms in the void is linked to the force, but this is only a qualitative speculative thought, which has given birth to the concept of mass.

The mass of an object is determined by the density and volume of the object. The relationship between the three is that the mass of an object is equal to the product of its density and volume.

Density: The intrinsic property of an object, which generally does not change with the change of volume under the same external conditions. The properties of matter refer to a property that matter itself has and can be distinguished from each other, and density is the inherent property of an object, which generally does not change with the change of volume under the condition that the external conditions remain unchanged.

Volume: The amount of space an object occupies. The SI system of units for volume is cubic meters.

The volume of a solid silver object is a numerical value used to describe the space occupied by the object in three-dimensional space. Objects in one-dimensional space (such as lines) and objects in two-dimensional space (such as squares) are zero-volume in three-dimensional space.