"Conversion and Conservation of Energy" Utilization of Internal Energy PPT Download

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"Conversion and Conservation of Energy" Utilization of Internal Energy PPT Download

Part One: Guidance Design

Learning point 1: Transformation and transfer of energy

Experiment 1: Rub your hands back and forth quickly to make your hands warm.

Experiment 2: Close the circuit of the toy car motor, and the car will drive quickly.

Experiment 3: Rub the pen on your hair or sweater and then bring it close to a small piece of paper. You will find that the paper is sucked up.

Thinking: Question 1: What kind of energy transformation occurred in the above experiment?

Answer: In Experiment 1, mechanical energy is converted into internal energy, in Experiment 2, electrical energy is converted into mechanical energy, in Experiment 3, mechanical energy is converted into electrical energy, and then electrical energy is converted into mechanical energy.

Question 2: After comprehensively analyzing the above experimental phenomena, what conclusions can you draw?

answer:____________________________.

Learning Point 2 Law of Conservation of Energy

Information 1: A large number of facts prove that during the process of conversion or transfer of any form of energy, the total amount of energy always remains unchanged. That is to say, energy will neither be destroyed nor created out of thin air. It will only be transformed from one form to other forms, or transferred from one object to other objects. In the process of transformation and transfer, the total amount of energy The quantity remains unchanged. This is the law of conservation of energy.

Information 2: The law of conservation of energy is one of the most universal and important basic laws of nature. From large celestial bodies in the universe to as small as the interior of an atomic nucleus, as long as there is energy transformation, it must obey the law of energy conservation. From daily life to scientific research and engineering technology, this law plays an important role. Humanity's use of various energy sources, such as coal, oil and other fuels, as well as water energy, wind energy, nuclear energy, etc., are all achieved through energy conversion.

Question: What did you learn from reading the passage above?

answer:____________________________________________.

Energy transformation and conservation PPT, part 2 content: summary of common exams

Type 1 Energy transfer and conversion

Typical Example 1 Point out the transformation or transfer of energy in the following phenomena.

(1) Photosynthesis of plants: __________________.

(2) Thunder and lightning on a rainy day: ____________________.

(3) People get hot and sweat while running: ____________________.

(4) The wind blows the sailboat forward: ____________________.

[Commentary by Famous Teachers] Judging the transformation and transfer of energy depends on the change in energy form and amount: In a certain phenomenon, if one form of energy decreases and another form of energy increases, then The transformation of energy; if the energy of one object decreases and the energy of another object increases, and the form of the energy remains unchanged, a transfer of energy has occurred.

Typical example 2 Among the following four phenomena, the process in which only energy transfer occurs but not energy conversion occurs is ( )

A. In winter, my hands feel cold when I touch metal poles outdoors.

B． When the switch is closed, the light bulb glows

C. When boiling water, the steam lifts up the lid

D. Charge your phone battery

Type 2: Correctly understand the law of conservation of energy

Typical Example 3 As shown in Figure 14-3-5, hang an iron lock with a rope, pull the iron lock to a position just close to your nose, release it after stabilizing, and keep your head still. The iron lock moves from the starting position a The arc ac moves to the highest point c on the other side, and then moves back from c.

(1) How does the kinetic energy and gravitational potential energy of the iron lock change during the process from point a to the lowest point b?

(2) Analyze whether the iron lock can touch the nose when swinging back from the perspective of energy conversion and conservation.

Solution: (1) From point a to point b, the gravitational potential energy of the iron lock gradually decreases and the kinetic energy gradually increases.

(2) Do not touch the nose. Because in the process of the iron lock moving from point a to point c and back from point c, it has to overcome the air resistance to do work, part of the mechanical energy is converted into internal energy, and the mechanical energy is reduced. The iron lock cannot reach point a when it returns, so the iron lock swings Don't touch your nose when returning.

(3) During the swing process of the iron lock, part of the mechanical energy is converted into internal energy, so the mechanical energy is not conserved, but the total amount of energy in the entire process is conserved.

Energy transformation and conservation PPT, Part 3: Class feedback

1. Frictional heat generation is the conversion of ________ energy into __________ energy. The external work done by the expansion of gas is ________ energy converted into ________ energy.

2. Combined with Figure 6-1, analyze the energy conversion process.

(1) In Figure A, when fuel is burned, the energy consumed is __________ and the energy obtained is __________.

(2) In Figure B, when plants perform photosynthesis, the energy consumed is __________ and the energy obtained is ________.

(3) In Figure C, when the hydropower station generates electricity, the energy consumed is ________ and the energy obtained is ________.

(4) In the picture, when the light bulb emits light, the energy consumed is ________ and the energy obtained is ____________.

(5) The transformation of energy in the four pictures shows that different forms of energy can ________ each other under certain conditions.

3. Energy neither ________ nor __________, it can only be converted from one form to ________, or transferred from __________ to __________, and in the process of transformation and transfer, the total amount of energy __________ . This is the law of conservation of energy. The essence of heat transfer is __________ of energy, and the essence of work is ________ of energy.

4. Tell whether the following process is a transformation or transfer of energy, and then analyze the situation of energy transformation or energy transfer.

(1) Drilling wood to make fire: ____________, __________________.

(2) Boil water and lift the lid of the kettle: ____________, ______________.

(3) A glass of water slowly becomes colder: ____________, _______________.

(4) The electric motor drives the water pump to transport water to high places: __________, ____________________.

[ Analysis Work is done on the lid to convert the internal energy into mechanical energy; (3) A glass of water slowly cools down, which changes the internal energy through heat transfer, and the internal energy is transferred from the water to the air; (4) The electric motor drives the water pump to transport the water To high places, the electrical energy is finally converted into mechanical energy of water.

5. Regarding the law of conservation of energy, which of the following statements is correct ( )

A. The law of conservation of energy only applies to the mutual conversion of mechanical energy and internal energy

B． The law of conservation of energy is not universally applicable

C. "Frictional heat generation" creates heat, which does not comply with the law of conservation of energy.

D. According to the law of conservation of energy, the total amount of energy in the universe remains unchanged

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Update Time: 2024-11-20

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