NATIONAL SCIENCE WEEK
Good morning families,
Next week, 13 – 21 August is NATIONAL SCIENCE WEEK
Students will be undertaking science based activities all through the week and we are listing some science ideas for you to try at home. Get the whole family involved ,its great fun! Here are 5 things to try this week.
Question? Why is it hotter at the Earth’s equator?
Materials: flashlight, white paper
Steps: 1. Turn the lights off in a room.
2.Put your piece of paper on a table and aim the flashlight straight down at the paper. Note and talk about what you see.
3. Now tilt your flashlight and aim it at the paper. Note what you see now.
FACTS: When the sun shines on the Earth at the equator, it is more intense, just like the flashlight facing straight down. When you move away from the equator the climate cools down because the light from the sun is at an angle.
Growing Both Ends
Grow roots and leaves from a potato.
Materials: 1 sweet potato, (the orange long ones are sweet potatoes), toothpicks, drinking glass, water
Steps: 1 Fill the drinking glass with water.
2. Stick some toothpicks in the middle of the potato so they poke out.
3. Place the potato into the drinking glass. The toothpicks will stop the potato touching the bottom of the glass.
4. Make sure the bottom part of the potato is touching the water.
5. Leave it for a few days. The bottom of the potato will sprout roots and leaves will grow out of the top.
FACTS: Potatoes are known as a root vegetable. This means that they grow from the roots of the plants under ground. Do you know of any other root vegetables?
Make a loaf of bread.
Materials: 1 tablespoon sugar, 1 tablespoon olive oil, 1 tablespoon yeast, 1 ¼ cups warm water, 3 ½ cups plain flour, 1 teaspoon salt, 2 bowls, (warmed up), 1 baking dish, pastry brush, oven.
Steps: 1: Mix the sugar, oil, yeast and water in one of the warmed bowls. Cover with glad wrap. After 10 or so minutes you should see this start to bubble and froth.
2: In your other warmed bowl, mix the flour and salt.
3: Add the frothing liquids to the flours mix. Mix and knead the bread with clean hands until the dough is smooth and stretchy and roll into a ball.
4. Brush the top of the dough with olive oil, put back into a warmed bowl and cover with glad wrap. Leave this in a warm place for 1 hour. Make a mark on the side of the bowl to show the top of the dough in the beginning.
5: Ask an adult to put the oven onto 220 C
6: Once the dough has doubled in size, roll it into a dome shape, brush the top with either olive oil or butter, put in onto a baking tray lines with oven paper and bake for 40-50 minutes or until the top is brown and the loaf sounds ‘hollow’ when tapped from the top.
7: Let the bread cool a bit then ENJOY.
FACTS: WHY does it rise up? Bread has an ingredient called yeast. (yeast remains dormant until mixed with water). The warm water activates the yeast, which begins feeding on the sugar. The yeast organisms make carbon dioxide, which is a gas. These bubbles of gas get trapped in the baking dough, and its these bubbles of gas that make the dough rise.
Make a piece of limestone .
Materials: shoe box, plastic garbage bag, paper cups, dry plaster, (you can get this from Bunnings), water, clean shells.
Steps: 1. Line the shoe box with the plastic bag, tape down the edges.
2. Add the plaster and water, following the directions on the back of the pack.
3. Add your shell pieces, mixing them right through the wet plaster.
4. Pour the mix into plastic cups.
5. Place the cups somewhere warm where they will NOT BE DISTURBED for 3-4 days.
6. After the plaster has dried, remove your limestone from the cups, should slip out easily, and describe what you see and feel.
FACTS: Limestone is a type of sedimentary rock made up of mostly calcium carbonate. When microscopic marine animals die they fall to the sea floor where their hard parts, (shells), collect and eventually form limestone.
How do mirrors reflect light?
Materials: small rectangular mirror, sheets of paper, coloured marker pens.
Steps; 1. Write your name in large letters on a sheet of paper
2. Now place the mirror upright on the edge of the paper so you can see your writing reflected. How do the letters in the mirror? Do any of them look the same in the mirror as they do on the paper?
3. With another sheet of paper, try and write your name in reverse. Hold up the mirror and check your writing. Does it look the right way around?
4. Keep improving your reverse writing to see if you can make the writing in the mirror look the right way around.
FACTS: Emergency services such as ambulance use this idea. The word AMBULANCE is written in reverse on the front of an ambulance vehicle so that drivers can read it correctly in their rear view mirror while driving.