"Internal Energy and Its Changes" Heat and Energy PPT Courseware

Description

"Internal Energy and Its Changes" Heat and Energy PPT Courseware

The main contents of molecular kinetic theory

1. Matter is composed of molecules

2. The molecules of all substances are constantly moving irregularly (thermal motion)

3. There are attraction and repulsion forces that interact between molecules.

Definition of internal energy of an object: Two ways in which the internal energy of an object can change:

When work is done on an object, the internal energy of the object increases

Convert other forms of energy into internal energy

When an object does work on the outside, its internal energy will decrease.

Internal energy is converted into other forms of energy

practise:

1. Regarding internal energy, the correct statement in the following example is ( )

A. The internal energy of an object increases because it must have absorbed heat.

B. The internal energy of an object increases because the outside world must have done work on it.

C. For the same object, the higher the temperature, the greater its internal energy.

D. As the mechanical energy of an object increases, its internal energy must increase.

2. In the following example, the internal energy is changed by heat transfer ( )

A. Extraterrestrial rocks fall into the Earth’s atmosphere and become meteors

B. The temperature of cold eggs increases when soaked in hot water.

C. The two hands rub against each other and the palms become warm.

D. When sawing wood, the saw blade becomes hot to the touch.

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"Internal Energy and Its Changes" Heat and Energy PPT Courseware 4:

"Internal Energy and Its Changes" Heat and Energy PPT Courseware 4 1. Internal Energy Since ancient times, people have been constantly looking for some kind of energy related to heat. Is heat a type of energy? Does it work? 1. Molecules have kinetic energy and potential energy. The molecules that make up matter are constantly undergoing thermal motion.

"Internal Energy and Its Changes" Heat and Energy PPT Courseware 3:

"Internal Energy and Its Changes" Heat and Energy PPT Courseware 3 Molecules have kinetic energy and potential energy. The molecules that make up matter are constantly undergoing thermal motion and also have kinetic energy. The interaction between molecules also makes them have potential energy. 1. Internal energy of an object 1. All the internal energy of an object...

"Internal Energy and Its Changes" Heat and Energy PPT Courseware 2:

"Internal Energy and Its Changes" Heat and Energy PPT Courseware 2 Internal energy is the sum of the kinetic energy and molecular potential energy of the thermal motion of all molecules inside an object. The unit of internal energy is Joule (J). A moving football has kinetic energy; so do moving molecules. When a spring is stretched or compressed...

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Update Time: 2024-10-04

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

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