Kids learn better by doing and experimenting hands-on, rather than reading from books.
Here are some activities that will get your kids interested in science.
If you fill up a glass half way with water and put an egg in, what happens? The egg will most certainly sink to the bottom.
Try to add 6-7 tablespoons of salt into the water and you will see that the egg will now float at the top of the glass.
This is due to the fact that salt water is thicker than normal tap water and therefore makes it possible for the egg to float in it.
Make a bean grow into a plant
Take a cotton ball or paper towel and wet it, put it at the bottom of a glass jar and drop your bean in the jar. You can use red kidney, broad, borlotti beans and can be a dried bean too.
Cover the bean with another wet cotton ball or paper towel.
Put some cling wrap over the jab and seal it with a rubber band.
With a needle make some holes in the cling wrap.
Within a couple of days, you will notice a sprout and in a week time your bean will be already quite tall.
After a couple of weeks, when the plant is quite tall and strong, you can plant it into a pot with some soil. Keep on watering it
From this experiment it can be learnt what plants need to grow, how to they absorb water and the whole plant life-cycle.
Raw or boiled egg?
If you want to surprise your friends that you can recognise if an egg is raw or boiled, show them this experiment. You will need two eggs.
Boil one egg, once it has cooled down put it in the fridge, so that it will get the same temperature as the raw egg.
Ask your friends to guess which one is the raw egg without smashing it.
To demonstrate that you know which one is which, you will need to spin the first egg, if it wobbles it’s the raw egg, but if it spins it’s the boiled egg.
This happens because the yolk and the white of the raw egg move around inside the shell, making the egg’s centre of gravity to change.
Squeeze the juice of one or two lemons into a glass. Pour the same amount of water as juice.
Put a teaspoon of baking soda and add some sugar for taste.
You have made your own lemonade fizzy drink by mixing lemon and baking soda a chemical reaction have created bubbles of carbon dioxide.
Take 5 to 10 drinking glasses and line them up.
Fill them up with different quantity of water, starting with a little water on the first one, to almost full for the last glass.
Wet your fingers and gently run them along the edges of one of the glasses, in a circular motion. You should here a sound and when you do the same to the other glasses, they will all have different sounds.
This is due to a principle called resonance. When you run your fingers along the rim of the glass it creates a tiny vibration, this generates sound waves, which travel through the water in the glass. The more water there is in the glass the slower is the vibration and therefore the sound will have a deeper, lower tone.
Water glasses musician
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