Why does friction heat up

When two objects rub against each other, the molecules on the contact surface collide with each other, which gives the molecules kinetic energy. When this kinetic energy continues to increase, macroscopic heat will be produced. This is why the contact surface always gets hot first

The function of sound energy

Infrasound energy is relatively high! Infrasound has strong destructive power. It seems that we have never heard of using sound energy

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1. Physics -- an example of using sound energy People use sound energy to do things. Who knows some examples of this,
2. Is sound energy mechanical
3. Second year physics ampere force to do work to convert the basic problem of energy! Very urgent! A small stick is connected to a closed loop placed on the table, and the friction force is ignored. There is B perpendicular to the table inward. When the stick moves to the right, we can know that in the horizontal direction, the stick is only subjected to the ampere force to the left, and the ampere force does negative work, So what energy does the kinetic energy of the rod convert into? Is it the heating energy of the resistor in the closed loop? Is the power of the ampere force equal to the power consumed in the closed loop? Why? The most important thing is why the power of Ampere force is equal to the power consumed in the closed circuit? Ampere force is the effect of magnetic field on the current. What is the relationship between ampere force and the power consumed in the closed circuit?
4. Does ampere force do work? Why
5. Does the iron absorption of magnet violate the law of conservation of energy? A piece of iron moves under the attraction of a magnet. Is the energy of the magnet converted into the kinetic energy of the iron? If so, why does the "magnetic force" of the magnet not gradually decrease?
6. Electromagnet converts electric energy into () energy? 1, kinetic energy? 2, mechanical energy? 3 and magnetic energy
7. Before the discovery of electromagnetic induction (electricity generated by magnetic energy), how do people use electricity and what kind of electricity is used to discover electricity generating magnetism?
8. What did the birds in the air inspire us to invent? Who invented it? When was it invented?
9. Mechanical energy, electric energy, internal energy, light energy and chemical energy
10. Kneel for the electric cooker cooking, water and rice, electric cooker power, cooking time function. Thank you
11. Friction between hands produces heat
12. Transformation of mechanical energy into heat energy in daily life I'll use it in class in an hour
13. Examples of conversion of mechanical energy into thermal energy
14. () are all a light energy B heat energy c electric energy converted from other forms of energy
15. Electric energy is consumed when working with electrical appliances. Twenty days is the energy that the electric current converts into by doing work with electrical appliances
16. The higher the power of the appliance, the more work the current does The greater the power of the appliance, the faster the current does work, right?
17. The power of lamp a is 60W, which means that the current passing through the filament is within 1 second () 1. The power of lamp a is 60 watts, which means that the current passing through the filament will convert () electric energy into heat energy and light energy in 1 second (). If the power of lamp B is 40 watts, compared with lamp A and lamp B, the one that converts electric energy into heat energy and light energy in 1 second is () lamp, and the brighter one is () lamp. So the brightness of the bulb is determined by () size 2. A small bulb marked with "2.5V, 0.36A", the number "2.5V" means (). If it is used in a 2V circuit, the measured current through it is 0.25A, then the rated power of the small bulb is (), and the actual power is () 3. If a motor works normally under 6V voltage and the current passing through is 2a, the motor will consume () joules of electric energy when it works normally for 1 minute
18. Can we say that when a small light bulb emits light, it converts electric energy into heat energy
19. Since pure resistance refers to the resistance that converts electric energy into heat energy, why does the bulb belong to pure resistance? Isn't it also converted into light energy?
20. Is solar energy used as power in space flight Solar panels collect solar energy and convert it into electric energy. Is electric energy converted into kinetic energy? It seems that the motor I think of can't provide power in vacuum. What can I do? Can I only rely on the fuel I carry? Let's not talk about the solar sail. I know that