"Kinetic Energy" Mechanical Energy and Its Transformation PPT Courseware

Description

"Kinetic Energy" Mechanical Energy and Its Transformation PPT Courseware

learning target

(1) Know the concepts of energy and kinetic energy;

(2) Understand the influencing factors of kinetic energy;

(3) Understand the application of factors affecting the size of kinetic energy in life.

1. The concept of kinetic energy

energy

If an object can do work on the outside, it means that the object has energy, or energy for short.

The unit of energy is joule, referred to as joule, and its symbol is J.

kinetic energy

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

2. The size of kinetic energy

Observation and Experimentation

Explore what factors are related to the size of kinetic energy

Ask a question

What factors are related to the kinetic energy of an object?

Conjectures and Assumptions

In car crash tests, for the same car, the greater the speed, the greater the degree of damage.

The difference between the feeling of a primary school student colliding with you and a tall and strong person colliding with you

The kinetic energy of an object may be related to the speed and mass of the object's motion.

Design experiments and develop plans

1. Let small balls with different masses slide down the same height of the inclined plane. Their speeds will be the same when they reach the horizontal plane. Observe the distance the trolley handle B is pushed out, and record the experimental results.

2. Let the same small ball slide down the slope from different heights. Their speeds when they reach the horizontal surface are different. Observe the distance the trolley handle B is pushed out, and record the experimental results.

Analysis and Demonstration

Experimental results show that: for objects with the same mass, the greater their moving speed, the greater their kinetic energy; for objects with the same moving speed, the greater their mass, the greater their kinetic energy.

Want to discuss

Why should there be a limit on the speed of motor vehicles? Why do different vehicle types have different speed limits on the same road?

For the same object, the greater the speed and kinetic energy, the greater the danger. Different models have different quality and size. If the speed of the car is the same, the greater the mass, the greater the kinetic energy, and the greater the danger.

Summary of this lesson

What did you gain from studying this class?

1. The concept of kinetic energy

Energy: An object can do work on the outside, which means that the object has energy, referred to as energy. The unit of energy is joule, referred to as joule, and its symbol is J.

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

2. Factors affecting the magnitude of kinetic energy

For objects with the same mass, the greater their moving speed, the greater their kinetic energy; for objects moving at the same speed, the greater their mass, the greater their kinetic energy.

Practice in class

1. Read the newspaper clipping in the picture and use physics knowledge to explain: Why can small steamed buns hurt people?

2. The car moves forward at the same speed when empty and full, and the kinetic energy is greater when ________;

3. When the working sprinkler truck is traveling at a constant speed, does its kinetic energy change? How?

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For more information about the PPT courseware "Mechanical Energy and Its Transformation into Kinetic Energy", please click on the Mechanical Energy and Its Transformation ppt Kinetic Energy ppt tag.

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Update Time: 2024-10-01

This template belongs to Physics courseware Lu Jiao Edition Eighth Grade Physics Volume 2 industry PPT template

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