Useful and Harmful Materials(W3-D1).pptx

Useful and Harmful Materials at Home

1. SCIENCE Name of Teacher

2. Useful and Harmful Materials Q1- WEEK 2- DAY 5

3. MOTIVATION Let us try to answer each riddle by guessing the material being described. If you can answer the 1st clue you’ll get 5 p oints 2nd clue- 3 points 3rd clue -1 point If you like to answer right away, just raise the group placard.

4. ITEM # 1 I am made of metal. Clue # 1: Clue # 2: Clue # 3: You can find me in the kitchen. People use me to fry their food. What am I? FRYING PAN

5. ITEM # 2 I am made of ceramic. Clue # 1: Clue # 2: Clue # 3: You can find me in the dining area. People use me if they want to drink coffee or tea.What am I? CUP OR MUG

6. ITEM # 3 I am made of fabric.. Clue # 1: Clue # 2: Clue # 3: You can find me in the closet. You use me after you take a bath. What am I? TOWEL

7. ITEM # 4 I am waterproof. Clue # 1: Clue # 2: Clue # 3: I am made of plastic. Your baby brother or sister play with me all the time. What am I? BABY RATTLES

8. ITEM # 5 I was made from trees. Clue # 1: Clue # 2: Clue # 3: My partner is pencil. Teachers and pupils use me in school. What am I? PAPERS

9. Based from the activity we did earlier, what are the materials described in the riddle? From what are they made of? Frying pan Cup or mug Towel Baby Rattles papers Give the property of each material. metal ceramics fabric plastic trees How do we use those materials?

10. GROUP ACTIVITY

11. Problem: Which materials are useful and harmful? What do you need? real objects such as face towel, tissue paper, glass, wires, casserole, firewood, sponge, sugar, kerosene, window What to do: 1. Observe the materials. 2. Write the property and uses of each material. 3. If these is harmful effect of each material, write their on the appropriate column. 4. Based on the given uses, tell whether each material is useful or harmful.

12. GROUP REPORTING

13. MATERIALS PROPERTY USEFULNESS HARMFUL EFFECT USEFUL OR HARMFUL? 1. FACE TOWEL 2. TISSUE PAPER 3. ELECTRIC WIRE 4. FIREWOOD 5. SPONGE absorbent Use to dry wet body none useful absorbent Use to wipe the dirt and to dry liquid none useful c onductivity Use to conduct electricity Get electrocuted if touched with bare hands Useful/ harmful flammability Use to cook food -Produce fire when left unattended -Create blister when touched with fire -Can cause skin injury when handling improperly Useful/ harmful absorbent Use to wipe or dry liquid. none useful

14. MATERIALS PROPERTY USEFULNESS HARMFUL EFFECT USEFUL OR HARMFUL? 6. SUGAR 7. KEROSENE 8. GLASS WINDOW 9. CERAMIC 10. CASSEROLE solubility Use to sweetened drinks and food. none useful flammable Use to produce fire Can cause explosion Useful/harmful Brittleness /transparency Use to absorb light from outside Can cause wound when someone touches the broken pieces of it Useful/ harmful brittleness Use to make vase, plates and cups Can cause wound when someone touches the broken pieces of it Useful/ harmful conductivity Use to cook food none useful

15. Properties of materials are used to determine the usefulness of the materials. Hard materials such as rocks are used in constructing buildings,roads and bridges. Woods are used to build houses and fence. Metals which are good conductors of heat are used in cooking. Rubbers which are elastic are used in making shoes and bags and stretchable bags. Towel, sponge, and tissue paper are porous materials which we use in wiping or drying liquids.

16. Window and eye glasses are transparent materials used in making windows which allow light to pass through them. Raincoat and umbrella are used during rainy days to protect us from the rain. These materials are waterproof. Flammable materials like firewood, paper and fuel are used in burning or cooking because they can be burned easily. Using these materials without extra care will make them harmful to us.

17. APPLICATION Mr. Marasigan, the PTA president made a trellis out of bamboos for gulayan sa paaralan . b. Carlos left the bottle of soft drink in the table. His 3-year old brother climb the chair to get the bottle on the table. After a minute, the bottle fell on the floor. Let us analyze these situations and tell whether the materials are useful or harmful.

18. EVALUATION Analyze each of the statement and tell whether the use of each material is useful or harmful. 1. A man is using lusong (mortar and pestle) to grind balinghoy to make nilupak . 2. A child is sucking plastic toys. 3. Mother is cooking bibingka through firewood. 4. Mang Isko , a blacksmith ( asero ) is curving stainless bars to make window grills. 5. There is a fire in a crowded community.