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When do we use filtration?
We use filtration when we want to separate a solid and a liquid. e.g. chalk and water The residue left behind at the filter paper will be chalk in this case, for it is a solid:)
Is sidewalk Biotic or abiotic?
sidewalk is abiotic
How can you use a roller skate a sidewalk and watermto demonstrate how rollind friction works?
If you push a rollerskate down the sidewalk and don't keep pushing it, rolling friction will eventually cause it to stop on its own (assuming that the sidewalk is level and not on a hill)
What happens when you add water to chalk?
Nothing will happen when you add water to chalk, because chalk does not dissolve in water. However, if you are drawing with chalk, as the water evaporates, it will allow the chalk to spread and create more fun.
Why white board invented?
The white board is more convenient than black boards / chalk boards in several ways. Black board or chalk board will not return to its original state without extensive cleaning of the chalk residue. White board when used with the correct pens will clean to a pure white with the appropriate chemicals. Chalk boards generate dust when using and cleaning. Cleaning the chalkboard erasers causes an inhalant irritant. It is messy. White boards do not generate dust and therefore are healthier and less messy. A white board can be edited with a paper towel, rag, dry eraser or even a finger. A white board is light weight, transportable and long lasting. It is economical and convenient.
