"Measurement of Energy Transformation" PPT

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"Measurement of Energy Transformation" PPT

Part One: Learning Objectives

1. Understand the concept of work and know the two necessary factors of work. Understand the relationship between the transformation of energy and work.

2. Know the calculation formula of work, know the unit of work, and initially master the calculation method of work.

When sodium hydroxide dissolves in water, the temperature needs to rise;

Ammonium nitrate dissolves in water and the temperature needs to be lowered.

How are the forms of energy transformed during the dissolution process of these two substances?

Former: chemical energy → thermal energy

The latter: thermal energy → chemical energy

Measurement of Energy Conversion PPT, Part 2: Classroom Activities

Activity 1: Lift the book high

Did you exert any force when lifting the book? In which direction?

Did the book move a certain distance? How does the direction of movement relate to the direction of the force?

Conclusion: If you exert force on the book, and the book passes a certain distance in the direction of the force, then you have done work on the book.

Activity 2: Push the book on the desktop

Did you use force when pushing the book? In which direction?

Did the book move a certain distance? How does the direction of movement relate to the direction of the force?

Conclusion: You have made another contribution to the book

Measurement of energy conversion PPT, Part 3: Two necessary factors for doing work in science

(1) Force acting on an object.

(2) The distance traveled by the object in the direction of the force.

In the following situations, has the person done any work on the suitcase he is carrying:

(1) The person lifted the suitcase on the ground with force, but did not lift it

(2) The person lifts the box with force again

(3) The person is holding the suitcase with all his strength and staying still in place

(4) A person carries a box and walks 50 meters on a level road.

(5) A person is holding a box and standing on a car that is moving horizontally and at a constant speed.

(6) The person puts the box on the elevator, and the elevator rises from the 1st floor to the 10th floor

(7) A person is ascending in an elevator carrying a suitcase

Measurement of energy transformation PPT, part 4 content: I realized:

1. Work is equal to the product of force and the distance traveled by the object in the direction of the force.

2. The formula of work:

Work = force x distance

W=F·S

(Note that S refers to the distance moved in the direction of F)

3. Unit of work: Joule

1 Joule = 1 Newton meter

(Meaning: The work done by a force of 1 Newton when an object passes through a distance of 1 meter in the direction of the force is 1 joule.)

Measurement of energy conversion PPT, part 5: Talk about gains

(1) What counts as doing work (two necessary factors for doing work)

1. The object is subject to force

2. The object must pass a certain distance in the direction of the force

(2) How to calculate work

1. The formula of work: work = force × distance W = F·S

2. The unit of work: Joule (Joule) 1 Joule = 1 Newton meter

(3) The relationship between function and energy

When an object does work on the outside world, it consumes its own energy, so the essence of doing work is the process of energy conversion.

How much work is done by the force on the object, how much energy is converted.

Work can be used to measure the amount of energy converted. The unit of energy is the same as the unit of work, which is the joule.

Keywords: Zhejiang Education Edition ninth grade science PPT courseware free download, measurement of energy conversion PPT download, .PPT format;

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"Measurement of Energy Transformation" PPT courseware:

"Measurement of Energy Transformation" PPT courseware Part One: Learning Objectives 1. Know the physical quantity power that describes the speed of work done by an object. 2. Know the power of common objects in life. 3. Be able to use the power formula to solve for power. ... ... ... Energy conversion...

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Update Time: 2024-11-21

This template belongs to science courseware Zhejiang Education Edition Ninth Grade Science Volume 1 industry PPT template

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