W2 sci - properties of materials(1)
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The document discusses various properties of common materials including strength, hardness, flexibility, elasticity, transparency, and buoyancy. It examines everyday items made of materials like metal, wood, rubber, plastic, cloth, and combinations thereof. Readers are prompted to consider which materials would be best for certain purposes based on their properties, like choosing a school book bag or a car windshield material. Key material properties and common items made from different materials are defined.
W2 sci - properties of materials(1)
- 3. Look around this room and name the objects you see.
- 4. a. strength *The plastic bag is strong; it can hold heavy things.
- 5. b. hardness *Sometimes, there leave scratch marks on the board. The wooden board but metal knife is harder.
- 6. c. buoyancy *The wooden boat floats on the water.
- 7. 01 d. flexibility *It can be bent without breaking because the rubber tube is flexible.
- 10. Can it bend or not? Is it strong? What do you think of this object? Is it hard or soft? Is it opaque or transparent? Can it float or sink? Does it absorb water or not?
- 11. Let us take a look a few everyday items: -are strong - will not break easily - do not bend easily What if it is made of rubber or cloth? What will happen?
- 12. Some are strong. Some are weak. Some are hard Some are soft.
- 13. Some can float. Some cannot float. Some are not flexible. Some are flexible.
- 14. -is transparent -can hold water without breaking -is brittle - has high resistant to heat Just imagine if it is made up of metal or wood. What will happen?
- 15. -is elastic and flexible -can expand when air is blown Just imagine if it is made up of cloth. What would happen?
- 16. -is waterproof - can walk in puddles without getting wet Just imagine if it is made up of metal or cloth. What will happen?
- 17. gold ring iron nails aluminium can steel knife - are strong and hard - are shiny - can’t float on the water
- 18. vase cup plates pot - are opaque - are brittle - have high resistant to heat
- 19. metal frying pan Combination of Materials wood rubber plastic
- 20. cloth -soft to sit down wood -to hold strongly the whole set Combination of Materials
- 21. A. Fill in the table: Look at the picture and identify what material each item is made of.
- 22. B. Short answer: 1. You want to buy a bag to carry books to school. What materials are you going to choose and why?
- 23. 2.What will happen if the wide-screen of a car is made up of metal or plastic?
- 24. C. Name the materials used to make each thing below. List ONE property of each material. Material: __________ Property: __________ Material: __________ Property: __________
- 25. D. Label the picture below according to its combined materials.