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

Description

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

Part One: Preview Perception

1. Energy

1. Definition: An object can do work on the outside, indicating that the object has energy.

2. International unit: Joule, symbol: J.

3. The more work an object can do, the greater the energy of the object.

2. Kinetic energy

1. Definition: The energy an object has due to motion.

2. All moving objects have energy.

3. Determining factors: speed, quality.

(1) For objects with the same mass, the faster they move, the greater their kinetic energy.

(2) For objects moving at the same speed, the greater their mass, the greater their kinetic energy.

3. Potential energy

1. Gravitational potential energy

(1) Definition: The energy an object has due to being lifted high.

(2) Determining factors: the height and quality of the lift.

2. Elastic potential energy

(1) Definition: The energy an object possesses due to elastic deformation.

(2) The greater the elastic deformation of an object, the greater its elastic potential energy.

Kinetic energy and potential energy PPT, part 2: interactive classroom understanding

Comparison of kinetic energy and potential energy

[Example] The J-20 is a new generation of stealth heavy fighter independently developed by my country. It has excellent maneuverability. When it accelerates and dives downward in the air, its kinetic energy ________ and gravitational potential energy ________. (Select "Increase", "Stay unchanged" or "Decrease")

Tips To answer this type of question, consider the factors that affect the magnitude of kinetic energy and gravitational potential energy. The focus is to analyze how the mass, speed, and height of the object change during the movement of the object, and then further determine the changes in kinetic energy and gravitational potential energy.

Analysis Factors that affect kinetic energy: mass and speed; factors that affect gravitational potential energy: mass and height. When the J-20 accelerates and dives downward in the air, the mass of the object remains unchanged, the speed increases, and the height decreases, so the kinetic energy increases and the gravitational potential energy decreases.

Answer Increase Decrease

Kinetic energy and potential energy PPT, part 3: try application

1. Energy

1. Which of the following statements about energy is incorrect ()

A. A bent bow can shoot an arrow far, and the bow has energy.

B. Falling objects from high altitude can injure people. Falling objects have energy.

C. Typhoons uprooted big trees. Typhoons have energy.

D. The rapid river water washes away the stone. The river water has no energy, but the stone has energy.

2. Kinetic energy

2. As shown in the figure, different small solid iron balls are placed on the inclined surface of the same experimental device and roll down freely, and hit the small wooden block stationary on the horizontal surface. In the following situations, what can show that the kinetic energy of an object is related to the mass of the object ()

A.A,B B.A,C

C. B, C D. C, D

3. If the speeds of cars, motorcycles and trains are equal, then the correct order of their kinetic energy from large to small is ()

A. Cars, motorcycles, trains

B. Trains, cars, motorcycles

C.Motorcycles, cars, trains

D. Cars, trains, motorcycles

3. Potential energy

4. What has elastic potential energy in the figure below is ()

5. Spread a piece of paper on the horizontal ground, paint the surface of the ball black, and let the ball fall freely from different heights, leaving black round spots A and B on the paper, as shown in the picture. The round spot formed by the ball falling from a higher place is _______ in the picture (please fill in "A" or "B"). It can be seen that the size of the gravitational potential energy is related to _______.

Keywords: Free download of PPT courseware for the second volume of eighth-grade physics published by People's Education Press, PPT download of kinetic energy and potential energy, PPT download of work and mechanical energy, .PPT format;

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.

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Update Time: 2024-09-23

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

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