"Exploring the Density of Matter" Material Around Us PPT Courseware 2

Description

"Exploring the Density of Matter" Material Around Us PPT Courseware 2

An old story:

In ancient times, there was a kingdom of Syracuse in the Mediterranean. Its king gave a goldsmith a certain quality of gold and asked the goldsmith to make a pure gold crown for himself. When the crown was completed and handed over to the king, the king discovered The gold crown was extremely beautiful, but the king suspected that the goldsmith had stolen his gold and replaced it with other cheap metals.

The king had the crown weighed on a scale, and the result was that the mass of the crown was the same as the mass of gold that the king gave to the goldsmith.

Ask a question:

1. How to tell if a crown is made of pure gold?

2. What is the material of the life jackets worn by flood rescue fighters?

3． Why can beautiful colors and layers be distinguished when preparing cocktails?

4． Why are balloons filled with hydrogen, helium or hot air?

Observe and think:

1. Iron block, aluminum block and copper block, how to distinguish them?

2. Wrap iron blocks and aluminum blocks with the same volume in paper. How to distinguish them?

3． How do you differentiate between iron and aluminum blocks of the same mass?

4． How do you differentiate between iron and aluminum blocks if they have different masses and volumes?

1. Experimental research

Experiment 1: Use a balance to measure the mass of different substances with the same volume. (Volume is known)

Conclusion: Different substances with the same volume have different masses.

Experiment 2: Use a balance to compare the volumes of different substances with the same mass

Conclusion: Different substances with the same mass have different volumes.

Experiment 3: Explore the relationship between mass and volume of the same substance

analysis and argumentation

Experimental proof:

The ratio between mass and volume of the same substance is constant.

Different substances have different ratios of mass to volume.

Therefore, this ratio reflects a property of the substance.

2. Density

1. Definition: The ratio of the mass of an object composed of a certain substance to its volume is called the density of the substance.

2. Physical meaning: a physical quantity that represents the properties of matter

3. Calculation formula:

Density = mass/volume

4. Unit:

International unit: kilogram/meter³ Kg/m³

Common units: g/cm³ g/cm³

practice

1. According to the density formula ρ=m/V, which of the following statements is correct ( )

A. The density of an object is proportional to its mass

B． The density of an object is inversely proportional to its volume

C． The density of an object is directly proportional to its mass and inversely proportional to its volume

D. Density is a property of matter that has nothing to do with mass or volume

2. The correct understanding of the density formula ρ=m/v is ( )

A. Density is proportional to the volume of the object

B. Density is inversely proportional to the volume of the object

C. The density of a substance is directly proportional to the mass when the volume is constant, and inversely proportional to the volume when the mass is constant.

D. Density is a characteristic of a substance. Its size is equal to the ratio of the mass and volume of the substance.

3. An aluminum ball has a volume of 500 cm³ and a mass of 540 grams. Is it solid? (Known ρ aluminum = 2.7 g/cm³)

Comparative density method: The average density of the ball can be found to be 1.08g/cm³ using the mass to volume ratio. Because 1.08kg/cm³＜2.7g/cm³, the aluminum ball is judged to be hollow.

Comparative volume method: The calculated volume of a solid aluminum ball with a mass of 540g should be 200cm³. Because 200cm³<500cm³, the aluminum ball is determined to be hollow.

Keywords: Materials around us teaching courseware, exploring the density of matter teaching courseware, Guangdong and Shanghai edition eighth grade physics PPT courseware download, eighth grade physics slide courseware download, matter around us PPT courseware download, exploring the density of matter PPT courseware Download, .PPT format;

For more information about the "Material Around Us Exploring the Density of Matter" PPT courseware, please click the Material Around Us PPT Exploring the Density of Matter PPT tag.

"Exploring the Density of Matter" Material around us PPT courseware:

"Exploring the Density of Matter" Materials Around Us PPT Courseware Teaching Objectives 1. Understand the definition, formula and units of density. 2. Conversion of density units will be performed. 3. Through experiments, measurements, calculations, analysis and comparisons, discover the mass and volume of the same substance..

"Scientific Inquiry: Density of Matter" Mass and Density PPT Courseware 3:

"Scientific Exploration: Density of Matter" Mass and Density PPT Courseware 3 [Experience] The relationship between the mass and volume of objects Activity 1: Take two iron blocks with different volumes and compare their masses. Activity 2: Take two iron blocks and wood blocks with the same volume and compare their masses..

"Scientific Inquiry: Density of Matter" Mass and Density PPT Courseware 2:

"Scientific Inquiry: Density of Matter" Mass and Density PPT Courseware 2 Discussion: 1. Compared with 1 catty of iron or 1 catty of cotton, which one is heavier? 2. Which one is heavier, 1m3 of iron or 1m3 of cotton? 3. Is the necklace real gold or gold-plated? (1) Ask questions: Question 1..

File Info

Update Time: 2024-06-22

This template belongs to Physics courseware Guangdong and Shanghai version of eighth grade physics volume 1 industry PPT template

Preview