"Density" Quality and Density PPT Courseware 2

Description

"Density" Quality and Density PPT Courseware 2

Question: Can you differentiate between iron and plastic blocks with the same surface color?

Explore: The relationship between mass and volume

Ask a question:

Is there a relationship between the mass and volume of an object?

What kind of relationship is there?

Conjectures and Assumptions:

1. Different objects composed of the same material?

2. Made of different substances?

design experiment:

Explore the relationship between mass and volume of objects

Think about it:

①How many physical quantities need to be measured?

mass and volume of objects

②What measuring tools are needed?

The concept of density: In physics, the mass per unit volume of a certain substance is called the density of the substance. Symbol "ρ"

unit:

In the International System of Units: kilogram/meter3 (kg/m3)

Other units: grams/cm3 (g/c m3)

1g/cm3 = 103 kg/m3

Density table

1. Could you please help find out the densities of alcohol and ice? Tell me its physical meaning?

How many g/cm3 does it add up?

2. Remember the density of water:

ρwater=1.0 10 3 kg/m3

Physical meaning: represents the mass of water per cubic meter

is 1.0 10 3 kilograms.

3. What characteristics or patterns can you find from the density table?

Density is a property of matter

4. People often say "Iron is heavier than cotton". The actual meaning of this sentence is ()

A. The mass of iron is greater than that of cotton

B. The volume of iron is larger than that of cotton

C. Iron is denser than cotton

DThe volume of cotton is larger than that of iron

practice

If a uniform cube iron block is cut in half, the mass and density of the remaining half of the iron block are: ( )

A. Both mass and density remain unchanged;

B. The mass is reduced by half, but the density remains unchanged;

C. Both mass and density are reduced by half;

D. The mass remains unchanged and the density is reduced by half.

For the density formula ρ=m/V, the correct understanding is [ ]

A． For different substances, the larger m is, the larger ρ is.

B． For the same substance, ρ is inversely proportional to V.

C. For the same substance, ρ is proportional to m.

D. None of the above statements are correct.

The picture below is an image made when exploring the relationship between the mass and volume of two substances A and B. The following analysis is correct ( )

A． The ratio of mass to volume of the same substance is different

B． The ratio of mass to volume of different substances is the same

C. The ratio of mass to volume of substance A is greater than that of substance B

D. The ratio of mass to volume of substance A is smaller than that of substance B

Xiao Ming found that the water tank placed outside in the cold winter was often cracked by freezing. As shown in the picture, what is the reason? Please help him do a calculation first: the mass of a full tank of water is 90kg.

⑴What is the volume of this tank of water?

⑵When the night is completely frozen, what is the volume of ice?

⑶Now can you help him find out the reason for this phenomenon?

(ρ water = 1.0×103kg/m3; ρ ice = 0.9×103kg/m3)

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Update Time: 2024-11-22

This template belongs to Physics courseware Lu Jiao edition eighth grade physics volume 1 industry PPT template

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