Teach how to maintain energy and mass with these educational resources. A ball thrown in the air: During throwing: Chemical energy of the muscles #-># Kinetic energy of the ball When the ball reaches its apogee: kinetic energy of the ball #-># Gravitational potential energy of the ball When the ball falls: gravitational potential energy of the ball #-># kinetic energy of the ball This is one of the fundamental laws of physics. Every day we observe many energy conversions from one form to another. Some forms, such as electrical and chemical energy, are more easily transferred than others, such as heat .B. Ultimately, all energy transfers lead to a warming environment and energy is wasted. For example, the PE of the falling object turns into k.E, but when it hits the ground, the K.E turns into heat and sound. If it seems during an energy transfer that some have disappeared, the lost energy is often converted into heat. This seems to be the fate of all available energies and it is one of the reasons why new sources of useful energy must be exploited. According to Einstein`s mass-energy relationship: E= m c², energy can be converted to mass and mass can be converted into energy. Pair production is an example of mass energy conversion. On the other hand, nuclear fission and nuclear fusion are examples of the conversion of mass into energy.
Newton`s cradle is the best product to demonstrate the law of energy saving. It consists of a few pendulum rockers, which are attached to a rod with the help of ropes. When a bob is spread and released, it hits the neighboring bob; Therefore, energy is transferred from one bob to another. This energy transfer continues until the last bobsleigh. The last pendulum bobsleigh does not have a nearby bobsleigh to transfer energy, so it dissipates energy by traveling the same distance as the first bobsleigh. The same experiment can be repeated by pulling two pendulum bobs together, which would move the last two bobsleighs from their original position. Similarly, for the displacement of the number `n` of bobs, `n` bobs move from their place to the opposite side, indicating the law of conservation of energy. When these fuel sources are burned, the potential energy is converted into heat and light energy. Energy is not consumed during the process. In addition, it is not created; Therefore, the implication of the law of energy conservation can be easily seen.
A pendulum: When the pendulum swings downwards: gravitational potential energy of the pendulum #-># kinetic energy of the pendulum When the pendulum swings upwards: kinetic energy of the pendulum #-># gravitational potential energy of the pendulum A skier slides on a hill: gravitational potential energy of the skier #-># kinetic energy of the skier + thermal energy of snow and sky (friction) The law of preservation of mass states, this mass is neither created nor destroyed in a chemical reaction. For example, the carbon atom in coal becomes carbon dioxide when it is burned. The carbon atom passes from a solid structure to a gas, but its mass does not change. Similarly, the Law of Energy Conservation states that the amount of energy is neither generated nor destroyed. For example, if you run a toy car on a ramp and it hits a wall, the energy is transferred from kinetic energy to potential energy. Speakers or speakers are the devices used to amplify and enhance the sound signal to produce a strong and better version of the input sound signal. The internal circuit of the speakers converts sound energy into electrical energy. The conversion of energy from one form to another clearly shows the law of energy conservation in everyday life. According to the Energy Conservation Act: “Energy cannot be produced or destroyed.
It can only be transformed from one form to another. A loss in one form of energy is accompanied by an equal increase in other forms of energy. When we rub our hands, we perform mechanical work that generates heat, that is, it is an example of an energy-saving law. Mechanical energy = thermal energy + losses Explanation Kinetic and potential energies are both different forms of the same basic amount, mechanical energy. The total mechanical energy of a body is the sum of kinetic energy and potential energy. In our previous discussion of a falling body, potential energy can turn into kinetic energy and potential energy into kinetic energy, but total energy remains constant. Mathematically, it is expressed as follows: When the switch connected to the bulb is pressed or turned on, the electrical connection between the power supply unit and the bulb is established. The current begins to flow through the closed circuit, which makes the bulb shine. Here, electrical energy is converted into light energy after entering the internal circuit of the bulb. Therefore, the light bulb is a striking example of the law of energy conservation. Inside a nuclear power plant: nuclear energy (from the decay of uranium) #-># thermal energy of water #-># kinetic energy of a turbine #-> # electrical energy + thermal energy (due to friction in the turbine and transmission lines) When the principle seemed to fail, applied to the type of radioactivity called beta decay (spontaneous emission of electrons from atomic nuclei), physicists have accepted the existence of a new subatomic particle, the neutrino, which should eliminate the missing energy instead of rejecting the principle of conservation. Later, the neutrino was detected experimentally.
Imagine a body of mass “m” placed at a point “p”, which is located at a height “h” from the ground. P.E of the body at A = mgh K.E of the body at point A = 0 The total energy of the body at point P = K. E + P.E = 0 + mgh of total energy at P = mg h ………. (1) If the body is allowed to fall freely under the action of gravity, its potential energy will continue to decrease while its kinetic energy will continue to increase. Just before touching the ground, the body`s potential energy will be minimal or zero, while the body`s K.E will be maximum. If “v” is the speed of the body just before impacting the ground, then K.E of the body = 1/2mv². Total energy at Q = K.E + P.E = mgx + mgh – mgx Total energy at Q = mgh ————(3) Equations (1), (2) and (3) show that the total energy of the body remains constant everywhere, provided that no frictional force is involved during the movement of the body. If a certain frictional force acts on the body, then the friction of the PE is lost by working against the frictional force. So: total energy = K.E + P.E + energy loss or the work is done against the frictional force. With the advent of relativity physics (1905), mass was first recognized as equivalent to energy. The total energy of a high-speed particle system includes not only their mass at rest, but also the very significant increase in their mass due to their high speed. After the discovery of the theory of relativity, the principle of conservation of energy was alternately called the preservation of mass energy or the preservation of total energy.
Conservation of energy, a principle of physics according to which the energy of interacting bodies or particles remains constant in a closed system. The first type of energy that was detected was kinetic energy, or kinetic energy. In some particle collisions, called elastics, the sum of the kinetic energy of the particles before the collision is equal to the sum of the kinetic energy of the particles after the collision. The concept of energy was gradually extended to other forms. The kinetic energy lost by a body that slows down as it moves upwards against gravity has been thought of as energy converted into potential energy or stored energy, which in turn is converted back into kinetic energy when the body accelerates when it returns to Earth. .