"Mechanical Energy" PPT (first lesson)

Description

"Mechanical Energy" PPT (first lesson)

Part One: Teaching Objectives

1. Know the concept of kinetic energy and understand the two factors that affect the size of kinetic energy.

2. Know the concept of potential energy and understand the factors that affect the magnitude of gravitational potential energy and elastic potential energy.

3. Understand the concept of mechanical energy.

4. Use the concept of mechanical energy to explain phenomena in life.

Mechanical energy PPT, part 2: kinetic energy

Why is the car driving so fast behind the bus so destructive?

Have great energy

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

After the May 7 drag racing accident in Hangzhou, the traffic police stated at the briefing that "through circumstantial evidence (proof of bystanders) and the perpetrator's confession, the speed of the car at the time was "around 70 yards." This immediately aroused doubts among netizens and the general public: around 70 yards How could the speed of the car cause the car to have such great energy and knock the victim into the air two stories high and land on the road about 20 meters away?

Mechanical Energy PPT, Part 3: Explore what factors are related to the size of kinetic energy?

Equipment provided: Incline, iron balls of different qualities, wooden blocks

hint:

1. How to change the quality?

2. How to obtain speed and change speed?

3. How to compare the magnitude of kinetic energy (using "indirect inference method")

4. What research methods were used in the experiment? How to operate?

Experimental plan analysis of factors affecting kinetic energy

Experimental principle

The amount of work done by the ball on the wooden block reflects the amount of kinetic energy the ball has.

control speed

Use the inclined plane to give the ball speed. If the height is the same, the horizontal starting point speed will be the same.

Experimental phenomena

Observe the distance the block is pushed by the ball.

Mechanical energy PPT, part 4 content: potential energy

Why are medicinal residues so destructive?

The energy an object has due to being lifted up is called gravitational potential energy

On November 4, 2008, after the incident of "Pharmaceutical residue flying at high altitude smashed through the new awning" was published, many people thought this incident was ridiculous. How could such a light pharmaceutical residue have such great energy to destroy the awning? What about punching a hole?

What is the relationship between the magnitude of gravitational potential energy and mass and height?

Equipment provided: aluminum plate, fine sand, iron balls of different qualities, scale

hint:

1. How to change the quality?

2. How to compare the magnitude of gravitational potential energy (using the "indirect inference method")

3. What research methods were used in the experiment? How to operate?

Mechanical energy PPT, part 5: elastic potential energy

The energy an object possesses due to elastic deformation

The longer the rubber band is stretched

The elastic deformation of the rubber band is greater

The paper bullets fly farther

The more work the rubber band does on the paper bullet

The greater the elastic potential energy of the rubber band

Mechanical Energy PPT, Part Six: Summary

Kinetic energy

The energy an object possesses due to motion

speeding train

running athlete

potential energy

gravitational potential energy

The energy an object has due to being lifted high

raised bell

pomegranate on tree

elastic potential energy

The energy an object possesses due to elastic deformation

Drawn bow bent stay

Mechanical energy

① Mechanical energy: kinetic energy, gravitational potential energy and elastic potential energy are collectively called mechanical energy; that is: kinetic energy and potential energy are collectively called mechanical energy

② The total amount of mechanical energy an object has is equal to the sum of kinetic energy and potential energy.

③ Kinetic energy is the energy an object has when it moves.

④ Potential energy is stored energy.

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.

"Mechanical Energy" PPT (second lesson):

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Update Time: 2024-11-22

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

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