Physics All Energy List 5, what exactly is energy in physics

1. Energy in physics refers to the description of the motion of all macroscopic and microscopic matter.

2. Energy is the quantitative transformation of the movement of matter, referred to as "energy". Everything in the world is in constant motion, and among all the attributes of matter, motion is the most basic attribute, and all other attributes are the specific manifestations of the attributes of motion.

3. In physics, energy is an indirectly observed physical quantity. It is often seen as the ability of one physical system to do work on other physical systems. Since work is defined as a force acting over a distance, energy is always equated with the ability to block the fundamental forces of nature along a certain length.

4. The total energy contained in an object is based on its mass, and energy, like mass, generally does not disappear out of nothing or for no reason. Energy, like mass, is a scalar quantity. In the International System of Units, the unit of energy is joules.

Energy can be understood as the ability of an object to do work.

The greater the ability to do work, the more work can be done.

The energy of an object is not necessarily doing work on the outside.

The object is doing work externally and must have energy.

For example, nuclear energy - atomic bomb - no, it cannot be said that it has no energy; ** When the energy is released, the damage caused is great!

Mechanical energy, including kinetic energy and potential energy, potential energy, in turn, includes gravitational potential energy and elastic potential energy.

Kinetic energy: The energy that an object has because of its motion. For example, Mercedes-Benz cars have kinetic energy;

Gravitational potential energy: The energy that an object has because it is in a high place. Such as: the shot put in the hand;

Elastic potential energy: The energy that an object has due to elastic deformation. Such as: elongated springs.

Internal energy: The sum of the kinetic energy and molecular potential energy of all the molecular thermal motion of an object. For example: a pot of boiling water, red-hot iron.

Wind energy: In fact, it is the kinetic energy of air movement;

Solar energy: Light has energy, such as infrared rays, which have a strong thermal effect and can be used to grill meat.

Nuclear energy: The mass lost during a nuclear reaction is converted into energy, which is used to heat water, forming water vapor and propelling the machine.

Geothermal: or internal energy.

Hydroelectric power, tidal power generation, etc., are all using the kinetic and potential energy of water.

Energy includes:

1. Thermal energy is internal energy The higher the temperature of the same object, the greater the internal energy, 2. Mechanical energy Mechanical energy includes kinetic energy, potential energy, anyway, it is related to motion belongs to mechanical energy, such as engines, springs, the faster the movement speed, the greater the energy

3. Nuclear energy Atomic bomb hydrogen bomb ** energy

4. Bioenergy.

5. Solar energy.

That's probably it, for wind energy, tidal energy belongs to the category of mechanical energy, and geothermal energy belongs to thermal energy, except for bioenergy, which is generally expressed in heat, and the unit is calories. All other physical energy is expressed in energy in joules.

There are too many questions, and the requirements are too high, so read the book yourself, there are all in the book.

Are you talking about the question of whether the energy of two times is added or subtracted?

Personally, I think it should be added up.

Because the definition of elastic potential energy is the potential energy that an object has due to elastic deformation, it is called elastic potential energy. The greater the deformation of the same elastic object within a certain range, the more elastic potential energy it has.

Pay attention to the sentence after the round beat.

The deformation is large, and the potential energy is large.

To ask about the change of the elastic potential and the macro energy of the wild cavity is to ask about the energy change of the final state and the initial state.

Deformation --- process of restoring --- deformation, and the deformation gradually becomes larger than the initial state.

So the energy is additive.

Then the answer is EQG(m+m) k

If there is any uncertainty, you can hi me ask again.

The length of the front and rear springs is: x1, x2;

The energy of the starting spring is:

mg=k *x1;

w1=;The energy of the rear spring is:

mg=k*x2;

w2=;The amount of change is: w2-w1;

The energy is scalar shirts, or trouser rows only the size of the pure lift;

Energy unit: joule, referred to as coke, symbol: j (kj, kilojoules) voltage unit:

Volts, abbreviated as volts, symbol: V (millivolts mv, kilovolts kv) current unit: amperes, abbreviated amps, symbol:

a (milliampere, microampere a) resistance unit: ohm, referred to as ohm, symbol: (megaohm, kiloohm k).

Electronvolt: An electronvolt is a unit of energy. Abbreviation EV.

Represents the kinetic energy gained by an electron (charge e = - 10 (-19) c) after being accelerated by an electric field of 1 volt.

mev；Megaelectron volts, 1mev is equal to -*10 (-13) joules.

How tall should it be? The current highest is.

(1) Chemical energy: in fuel;

2) Kinetic energy: cars on the highway;

3) Gravitational potential energy: stones on the top of a mountain;

4) Elastic potential energy: stretch the spring;

5) Light energy: sun;

6) Internal energy: All objects have internal energy;

7) Nuclear energy: nuclear reactors in nuclear power plants;

8) Electricity: battery;

9) Magnetic energy: magnet;

10) Hydro: sea;

11) Wind energy: natural wind;

12) Geothermal energy: Earth;

13) Radiant energy: radioactive atoms. Such as "radium".

Chemical energy: There is in the fart.

Kinetic energy: An object in motion.

Gravitational potential energy: An object that is far from the ground.

Thermal energy, wind energy, hydro energy, electromagnetic energy.

Internal energy, a property that any object has, is produced by molecular motion; Chemical; electrical energy, through electromagnetic induction or chemical reactions; nuclear energy, mass loss through nuclear fusion or nuclear fission; Solar energy, needless to say, seems to be a large-scale nuclear reaction of the entire planet; Wind energy; Water; Terrestrial heat;