It is easy to write on a rough blackboard. The friction between the chalk and the rough surface is what allows the chalk to leave behind the chalk dust that we see. Actually it would impossible to write on a theoretically smooth blackboard. Without the friction, the chalk would not leave any residue!
A blackboard appears black because it reflects very little light, absorbing most of the light that hits it. The dark color of the board helps to contrast with the white chalk used to write on it, making the writing clearly visible.
White light is a combination of all visible light frequencies, making it continuous rather than a single, distinct frequency. Therefore, it is not possible to write down a specific frequency for white light.
Writing on a rough surface can be more difficult because there is more resistance and friction between the writing tool and the surface. This can lead to uneven or inconsistent writing. Writing on a smooth surface allows the writing tool to glide more easily, resulting in smoother and more controlled writing.
A sharp point on a pencil will be eroded by a rough surface (paper) and leave a coating of graphite. This does not immediately penetrate the paper and can be erased. After some time, the paper will absorb some graphite molecules into its structure, and erasures will not be complete.
The irritating noise when writing on a chalkboard happens at certain angles due to a phenomenon known as "stick-slip motion." When the chalk is held at these angles, it alternates between sticking and slipping on the board surface, creating vibrations that produce the noise. At other angles, the chalk moves more smoothly without the stick-slip behavior, resulting in no noise.
Chalk is made of calcium carbonate, a soft mineral that leaves a visible mark when drawn on a rough surface like a blackboard. When drawn on the blackboard, chalk particles rub off and stick to the surface due to friction, creating a visible line.
Chalk is able to write on a board because of its soft texture. When dragged across a rough surface like a chalkboard, the chalk leaves behind particles that stick to the surface, creating readable markings.
A black board is used as an instructional tool at the front of a classroom. A teacher uses a blackboard to write information about the subject they are teaching to a classroom.
You can use it in homemade toothpaste recipes in place of baking soda. Also used in the construction trade when 'snapping' a chalk line on a board, etc.
To write your ideas as completely and coherently as possible without worrying about grammar and mechanics
Bart writes, "i will not illegally download this movie"
ruf
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A black board is what some teachers have and some very lucky people have some too. They are a little bit like white boards but you need to write on white boards with white board pens and on black boards you need to use chork. You can use any length or any colour chork.
write a letter
The drafting stage is when you would write a rough draft. At this stage you do not worry about grammar, but focus on the creating the paper.
rough draft is another word for pre-write.