"Application of Density" Materials Around Us PPT Courseware 2

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"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. Density calculation formula:

Density = mass/volume

The formula is: p = m/v

What did you find?

1. Different substances generally have different densities.

2. Generally, the density of solids is the highest, followed by the density of liquids, and the density of gases is the smallest.

3. When the state of the same substance changes, the density also changes accordingly.

Application of density knowledge

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=19.3×103kg/m3)

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? (ρ aluminum = 2.7×103kg/m3)

Typical questions on density calculation

1. The problem of equal quality

Example: What is the volume of an ice cube with a volume of 100cm3 after it melts into water?

Idea: From the fact that the mass has nothing to do with the _______ change of the object, it can be seen that the mass does not change. According to the same mass, the equation is

m ice = m water

p ice V ice = p water V water

2. The problem of equal volumes

Example: A bottle can hold 1 kilogram of water. How many kilograms of alcohol can be held in this bottle?

3. The problem of equal density

Example: The geological team member measured the volume of a boulder to be 20m3. Now they obtained a 20cm3 sample from the boulder and measured the mass of the sample to be 52g. Find the mass of the boulder.

4. Determine the problem of hollow and solid

Example: A copper ball with a volume of 0.5dm3 and a mass of 2580g is asked whether it is hollow or solid? If it is hollow, what is the volume of the hollow part?

Summarize

1. Find out the known and unknown

2. Find equal quantities

3. Choose the appropriate formula

4. List the equations

5. Units are unified, solving with value

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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:

"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. three,..

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Update Time: 2024-10-15

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

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