"Which material is hard" Materials around us PPT courseware 2

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"Which material is hard" Materials around us PPT courseware 2

Around us, there are many objects made of different materials. We are all familiar with wood, fiber, paper, glass, metal, plastic, rubber, etc.

Characteristics of wood: yellowish white, easy to absorb water, easy to process, able to float on water, textured on the surface, relatively hard, etc.

Most common materials: wood, fiber, paper, glass, metal, plastic, rubber.

Objects are made of one or more materials, and there are many different types of materials around us.

Debate questions

1. All substances are materials. ( )

2. Fuel, chemical raw materials, food, and medicine are generally materials. ( )

3. The casing of the TV is made of metal. ( )

4. Nowadays, the walls in homes are decorated with wallpaper. ( )

5. Bubble gum is the material. ( )

We chose the four most common items around us: wooden strips, cardboard, nails and plastic to study. Which of them is harder? Try to come up with a research method yourself first.

Compare hardness

You can prepare two wooden strips, cardboard, iron nails and plastic rulers each, and use one wooden strip to mark the other wooden strips, cardboard, iron nails and plastic ruler respectively. Can wood strips leave scratches on their surfaces? Repeat the experiment with cardboard, iron nails, and plastic rulers.

Empty used aluminum cans can be recycled. Empty aluminum cans returned to the factory can be heated and smelted into aluminum sheets to produce new aluminum cans. This saves many resources and energy than mining bauxite.

What should we do with the empty aluminum cans after drinking the beverage?

1. Why are kitchen knives, sickles, hammers, etc. made of iron instead of lead?

2. Silver conducts electricity better than copper. Why are wires generally made of copper instead of silver?

3. Why are the filaments in light bulbs made of tungsten instead of tin? What might happen if it were made of tin?

4. Why are some iron products such as faucets plated with chrome? What about gold plating?

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For more information about the PPT courseware "Which material is hard among the materials around us", please click the Materials around us ppt Which material is hard ppt label.

"Which material is hard" Materials around us PPT courseware 3:

"Which material is hard" Materials around us PPT courseware 3 We choose the four most common items around us: wooden strips, cardboard, nails and plastic to study. Which of them is harder? Try to come up with a research method yourself first. Comparing hardness, you can prepare wood...

"Which material is hard?" Materials around us PPT courseware:

"Which material is hard" PPT courseware of materials around us. Based on the results we observed, arrange the wooden strips, iron nails and plastic rulers in order of hardness from large to small. Which material is the hardest? Iron nails, plastic rulers and wooden strips. Let’s take a look at the story of beverage cans on page 50 of the book..

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Update Time: 2024-11-24

This template belongs to science courseware Third Grade Science Volume 1, Textbook Edition industry PPT template

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