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

Description

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

1. Introduction to review

In the following situations, what work does a person do on an object ( )

A. Weightlifter holds the barbell motionless while being photographed by reporters

B． A person carrying a heavy object moves forward at a constant speed along a level road

C. A person pushes a cart with force and the cart moves on the horizontal ground in the direction of the force.

D． The child tried hard to move the stone but failed to move it

2. Ability

1. If an object can do work, we say it has energy.

2. The more work an object can do, the more energy it has.

3. Unit of energy: joule (J)

(ii) Factors affecting the magnitude of kinetic energy

1. Explore: What factors are related to the size of kinetic energy?

guess:

1. The amount of kinetic energy is related to the speed of the object’s movement.

2. The amount of kinetic energy is related to the mass of the object

Summary conclusion:

When the mass is the same, an object with speed __ can do more work, indicating that it has kinetic energy __

Experiment: Explore the relationship between kinetic energy and mass

Comparing the two experiments on the right, we get:

When the speed is the same, an object with mass __ can do more work, which shows that it has kinetic energy __

Summarizing the above two sets of conclusions, we can draw:

The bigger the moving object is, the more kinetic energy it has.

3. The concepts of kinetic energy, gravitational potential energy, and elastic potential energy

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

2. The energy an object possesses due to being lifted high is called gravitational potential energy

3. The energy an object possesses due to elastic deformation is called elastic potential energy.

Physics knowledge in life

Explained in physics terms:

1. Why should the driving speed of motor vehicles be limited?

2. Why do different car models have different speed limits on the same road?

after class homework

Explore: What factors affect the magnitude of kinetic energy and gravitational potential energy? What objects around you can be used, and what experiments can you design to test your conjecture?

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For more information about the PPT courseware "Work and Mechanical Energy Kinetic Energy and Potential Energy", please click the Work and Mechanical Energy ppt Kinetic Energy and Potential Energy ppt tag.

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

"Understanding Kinetic Energy and Potential Energy" Mechanical Work and Mechanical Energy PPT Courseware 2 1: What is energy? (a) A stretched bow can shoot an arrow (b) Waves hit a surfboard (c) A deformed springboard bounces the athlete up (d) A diver falls into the water and splashes 1. Objects can do things to the outside world..

"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.

"Kinetic Energy and Potential Energy" Work and Mechanical Energy PPT Courseware 6:

"Kinetic Energy and Potential Energy" Work and Mechanical Energy PPT Courseware 6 Lesson Objectives: Know what kinetic energy and potential energy are, understand what factors are related to the magnitude of kinetic energy and potential energy, and use the control variable method and conversion method to research problems... ... ... Explore: What factors are related to the size of kinetic energy? ..

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Update Time: 2024-08-11

This template belongs to Physics courseware People's Education Edition Physics for Grade 8, Volume 2 industry PPT template

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