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

Description

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

1. Energy

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

2. Unit: Joule (J)

Note: The more work an object can do, the greater the energy of the object

What kind of energy do we often hear about in our lives?

Thermal energy Light energy Electrical energy Magnetic energy Mechanical energy Kinetic energy Potential energy Chemical energy Nuclear energy

2. Kinetic Energy:

1. Definition: The energy possessed by an object due to its motion is called kinetic energy.

Note: All moving objects have kinetic energy.

2. For objects with the same mass, the faster they move, the greater their kinetic energy; for objects with the same moving speed, the greater their mass, the greater their kinetic energy.

1. Determine the change of kinetic energy

①When a car accelerates, its kinetic energy_____.

② When the train enters the station, it decelerates and its kinetic energy _____; after it stops, its kinetic energy is equal to _____.

③A sprinkler truck moves at a constant speed on the road and sprays water. Its kinetic energy _____.

2. Compare the kinetic energy

① When a car is empty and fully loaded, it moves at the same speed: the kinetic energy is greater when it is _____.

② A student jogs and runs fast: The kinetic energy is greater when _____.

3. Potential Energy

1. Gravitational potential energy

1) Definition: The energy of an object determined by its height.

Think about it: What factors are related to the magnitude of gravitational potential energy?

2) The greater the mass of an object and the higher its position, the greater its gravitational potential energy.

2. Elastic potential energy: the energy of an object due to elastic deformation.

3. Potential energy: Gravitational potential energy and elastic potential energy are collectively referred to as potential energy

A helicopter ascending at a constant speed has a ( )

A. Kinetic energy increases, but gravitational potential energy remains unchanged

B. Kinetic energy remains unchanged, but gravitational potential energy increases

C. Both kinetic energy and gravitational potential energy increase

D. Both kinetic energy and gravitational potential energy remain unchanged

summary

1 Kinetic Energy:

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

2. All moving objects have kinetic energy.

3. The greater the mass of a moving object, the greater its speed and the greater its kinetic energy.

2. Potential Energy:

1. The energy that an object possesses due to being lifted is called gravitational potential energy.

2. The greater the mass of an object and the higher its position, the greater its gravitational potential energy.

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

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

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Download the PPT of "Kinetic Energy and Potential Energy" on work and mechanical energy:

Download the PPT of "Kinetic Energy and Potential Energy" Work and Mechanical Energy Part 1: Knowledge Points Classification Practice Knowledge Point 1 Energy 1. If an object can _____ to the outside, we say that the object has energy, referred to as ___. The more work an object can do, the more powerful the object is..

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

"Kinetic Energy and Potential Energy" Work and Mechanical Energy PPT Teaching Courseware Part I Content: Knowledge Points Basics Knowledge Point 1 Energy Kinetic Energy 1. Which of the following statements is correct (D) A. An object with energy must be doing work B. The greater the energy an object has, the more work it does C. An object..

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

"Kinetic Energy and Potential Energy" Work and Mechanical Energy PPT Part 1 Content: Preview Perception I. 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 more energy the object has..

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Update Time: 2024-11-22

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

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