"Application of Density" Materials Around Us PPT Courseware

Description

"Application of Density" Materials Around Us PPT Courseware

teaching objectives

1. Learn to use balances and measuring cylinders to measure the density of substances.

2. Be able to use density to identify substances and calculate the mass and volume of objects. Explain some density-related physical phenomena in life.

3. Be able to look up density tables to understand the densities of common substances.

4. Through hands-on experiments, learn how to use physical formulas to indirectly measure physical quantities.

5. Cultivate students’ ability to use density knowledge and mathematical methods to solve practical problems.

6. Through the application of density knowledge, experience the practical application of physical knowledge in production and life, and feel the value of physical knowledge in solving practical problems.

Detection Preview Exchange Display

1. Detection

a. Memorize the densities of water and other five common substances, learn to derive the deformation formula of density, and learn to use the deformation formula for calculations.

b. Briefly describe the steps for measuring the density of solids and liquids.

Notice

a. The gas density table indicates the condition of "0°C, at standard atmospheric pressure".

b. The density of mercury in liquid is relatively large, which is greater than the density of ordinary metals.

c. The density of gases is relatively small.

2. Application of density

1. Identify substances:

[Example 1] A medal has a mass of 45g and its volume is measured to be 5cm3. Please determine whether it is made of pure gold. (ρ gold=19.3g/cm3)

2. Seeking quality:

[Example 2] The length, width, and height of a classroom are 10m, 8m, and 3m respectively. Try to find: the quality of the air in the classroom. (ρ empty=1.29kg/m3)

3. Find the volume:

[Example 3] There is a large aluminum spoon. Its mass is 540g. What is its volume? (ρaluminum=2.7g/cm3)

expand:

The shot put used in the school physical education class has a mass of 2.5kg and a measured volume of 316cm3. Please tell if it is made of lead?

Life application

1. How do geological workers determine what kind of metal an ore is?

Experimental principle: ρ=m/v

Experimental equipment: balance, measuring cylinder, water, stones

Measurement steps

Referring to the three pictures above, please describe the steps for measuring the density of ore, design a table for recording data, and write the expression for density.

1. Use a balance to measure the mass m of the ore.

2. Use a measuring cylinder to measure the volume V1 of water.

3. Put the ore into the measuring cylinder and measure the total volume V2 of water and ore.

Ore density expression: ρ=m/v2-v1

How much does the volume of 2m³ of water increase when it freezes?

If transported by oil tanker, its density is 0.85×10³kg/m³. If the capacity of each tank truck is 80m³, how many tank trucks are needed to transport 2000t of oil?

If two metals A and B with the same volume and densities ρ1 and ρ2 are made into an alloy, what is the density of the alloy?

If two metals A and B with the same mass and densities ρ1 and ρ2 are made into an alloy, what is the density of the alloy?

Operation:

Classwork: Questions 1, 2, 3, 4, and 5 on page p123.

Tutorial (preview):

a. What is magnetism and magnet? What are the applications?

b. What are conductors and insulators? What are the applications?

c. Briefly describe semiconductors and superconductors.

d. What is thermal conductivity? What are the applications?

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For more information about the PPT courseware "Applications of the Density of Materials Around Us", please click on the Application ppt tab of "Applications of the Density of Materials Around Us".

"Application of Density" Materials Around Us PPT Courseware 3:

"Application of Density" Materials Around Us PPT Courseware 3 Review Questions: (1) What is the density of matter? The mass per unit volume of a substance is called the density of the substance. (2) What are the formulas and units for calculating the density of matter? (3) Requires the confidentiality of substances..

"Application of Density" Materials Around Us PPT Courseware 2:

"Application of Density" Materials Around Us PPT Courseware 2 1. The concept of density In physics, the ratio of the mass to the volume of an object composed of a certain substance is called the density of the substance. 2. The calculation formula of density: density = mass/volume. The formula is: p = m..

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Update Time: 2024-09-08

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

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