"Mechanical Energy" PPT (second lesson)

Description

"Mechanical Energy" PPT (second lesson)

Part One: Teaching Objectives

1. Know that kinetic energy and potential energy can be converted into each other.

2. Know that mechanical energy is conserved

Mechanical Energy PPT, Part 2: Classroom Experiment

Experiment 1: Simple Pendulum Experiment

Divide into groups to conduct pendulum experiments and study the conversion of kinetic energy and potential energy through experiments.

Analyze the energy conversion process between three points A, B, and C.

Analyze speed changes

Experiment 2: Roll experiment

Observe the experiment and discuss the following questions in groups:

The rolling pendulum is at rest at its highest point, and it has _________ function.

During the descent of the balance wheel, the gravitational potential energy changes to ___, the kinetic energy changes to ___, and the rotational speed becomes ___.

During the rising process of the balance wheel, the gravitational potential energy changes to ___, the kinetic energy changes to ___, and the rotational speed becomes ___.

Experiment 3: A small ball rolling down from a high place

1. What form of energy does the ball have at each point A, B, C, and D?

2. Energy conversion during the movement of a small ball rolling down from a high place:

A→B: Gravitational potential energy is converted into kinetic energy

B→C: Kinetic energy is converted into gravitational potential energy

C→B: Gravitational potential energy is converted into kinetic energy

B→D: Kinetic energy is converted into gravitational potential energy

Experiment summary

Conclusion: Gravitational potential energy and kinetic energy can be converted into each other.

Group discussion: List examples of the mutual conversion of kinetic energy and gravitational potential energy in daily life.

Mechanical energy PPT, Part 3: Application of mechanical energy conversion

Conversion of kinetic energy and gravitational potential energy during the operation of artificial earth satellites

Discussion: The speed of the satellite is larger at perigee and smaller at apogee. Then, how does the satellite's kinetic energy and gravitational potential energy change when it moves from perigee to apogee?

Mechanical energy PPT, part 4 content: Law of conservation of mechanical energy

(1) Kinetic energy and potential energy are collectively called mechanical energy

(2) Mechanical energy conservation condition: If only kinetic energy and potential energy are converted into each other, the total mechanical energy remains unchanged.

Namely: the law of conservation of mechanical energy

Mechanical Energy PPT, Part 5: Class Summary

1. Kinetic energy can be converted into gravitational potential energy, and gravitational potential energy can also be converted into kinetic energy.

2. Kinetic energy and potential energy are collectively called mechanical energy

3. Mechanical energy conservation condition: If only kinetic energy and potential energy are converted into each other, the total mechanical energy remains unchanged.

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

For more information about the "Mechanical Energy" PPT courseware, please click on the Mechanical Energy ppt tab.

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Update Time: 2024-10-05

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

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