"Understanding Kinetic Energy and Potential Energy" Mechanical Work and Mechanical Energy PPT Courseware 2

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"Understanding Kinetic Energy and Potential Energy" Mechanical Work and Mechanical Energy PPT Courseware 2

1: What is energy?

(a) A drawn bow can shoot an arrow

(b) Waves hitting the surfboard

(c) The deformed springboard bounces the athletes up

(d) The diver fell into the water and splashed

1. If an object can do work on the outside, we say that the object has energy or energy.

2. In the International System of Units, the unit of work is joule (J), and the unit of energy is also joule (J).

2: What factors are related to the size of kinetic energy?

1 Kinetic energy: The energy an object possesses due to motion is called kinetic energy.

2 Conclusion: The kinetic energy of an object is related to its mass and speed. The greater the speed and the greater the mass, the more kinetic energy it has.

Three: What factors are related to the size of potential energy?

1. Potential energy:

(1) The energy an object has due to being lifted high is called gravitational potential energy.

(2) The energy an object possesses due to elastic deformation is called elastic potential energy.

(3) Gravitational potential energy and elastic potential energy are collectively called potential energy.

2 Conclusion: The higher the object is lifted and the greater the mass, the more gravitational potential energy it has; the stronger the elasticity of the elastic object and the greater the deformation, the more elastic potential energy it has.

Four: Conversion of mechanical energy

1. The kinetic energy and potential energy of an object are collectively called mechanical energy.

2. Conclusion: The kinetic energy and potential energy of an object can be converted into each other; when there is resistance such as friction, the mechanical energy will continue to decrease during the mutual conversion of kinetic energy and potential energy.

(If resistance such as friction is not considered, the mechanical energy remains unchanged.)

practice

1. As shown in the figure, when the artificial earth satellite moves from perigee to apogee, which of the following statements is correct ( ).

A. Potential energy decreases and kinetic energy increases

B. Potential energy increases and kinetic energy decreases

C. Potential energy increases but kinetic energy remains unchanged

D. Potential energy increases and kinetic energy increases

2. Modern automobile manufacturing plants must conduct crash tests to test the performance of the car before it is officially put into production. The figure shows the process of the collision test. Where does the car's kinetic energy go after hitting the wall? Do you know the technical implications of conducting this experiment?

3. There are signs restricting the speed of cars on the highway. Think about the reason for this?

summary:

1: What is energy? What is the unit of energy?

2: What is kinetic energy? What factors are related to the size of kinetic energy?

Three: What is gravitational potential energy? What factors are related to the magnitude of gravitational potential energy? What is elastic potential energy? What factors are related to the size of elastic potential energy?

Four: Kinetic energy and potential energy are collectively called mechanical energy. Be able to give examples and explain the mutual conversion of kinetic energy and potential energy.

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For more information about the PPT courseware "Mechanical work and mechanical energy, understanding kinetic energy and potential energy", please click the "Mechanical work and mechanical energy ppt understanding kinetic energy and potential energy" ppt tag.

"Understanding Kinetic Energy and Potential Energy" Mechanical Work and Mechanical Energy PPT Courseware:

"Understanding Kinetic Energy and Potential Energy" Mechanical Work and Mechanical Energy PPT Courseware Learning Objectives: 1. Know that mechanical energy consists of kinetic energy and gravitational potential energy, and know the influencing factors of kinetic energy and gravitational potential energy; 2. Understand that kinetic energy and gravitational potential energy can be converted into each other and explain related phenomena.

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Update Time: 2024-07-01

This template belongs to Physics courseware Guangdong and Shanghai Edition Ninth Grade Physics Volume 1 industry PPT template

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