Why a pencil will write on paper but not on glass?
It is difficult to write on the glass with a pencil because the friction on the glass is very less which creates difficulty in writing. On the other hand, since the paper has more friction it is much easier to write on paper as compared to glass.
Why do we write with pencil on paper?
Why is writing with a chalk on glass not clear at all?
Why is it difficult to write on a glass surface * due to high friction glass surface is smooth it does not provide friction to the tip of the pen?
What is the role of friction in writing on paper with a pencil?
How long does a pencil last?
Pencils are numbered from 1-3 but most people use a number 2. Harder lead makes a lighter mark and softer lead makes a darker mark. How long does a pencil last? It’s been estimated that the average pencil has enough graphite to write about 45,000 words!
How long can a pencil write?
1. On average a pencil can be sharpened 17 times, draw a line 35 miles long and can write approximately 45,000 words.
What will happen if we try to write on glass and cell phone with a pencil?
It is difficult to write on the glass with a pencil because the friction on the glass is very less which creates difficulty in writing.
Can we write on blackboard?
The words written should be clearly visible to the students in the last line. Will highlight the main points with colored chalk. The words written should be in a straight line. Blackboard writing will be done without speaking.
Why can’t you write properly with a chalk on a glass sheet?
The surface of glass sheet is smooth, because of the smooth surface of glass the friction becomes less . This means the interlocking of molecules is also less , because of less interlocking of molecule we are unable to write on the glass sheet.
Why is it hard to write on smooth paper?
Solution : A force of friction acts at the point contact of the pen and the paper against the motion of the pen. For a very smooth paper frictional force is low and the pen slips on the paper surface. For a very rough paper frictional force is quite high and this makes it difficult to move the pen over the paper.
Why is it difficult to write on a blackboard with broken surface?
Because broken surface provide friction more than required so it is difficult to write.
Can graphite make you sick?
Graphite is relatively nonpoisonous. There may be no symptoms. If symptoms do occur, they may include stomachache and vomiting, which could be from a bowel obstruction (blockage). The person may choke while swallowing the pencil.
Is pencil lead toxic?
Pencil “lead” is actually graphite which is safe and non-toxic.
Is graphite harmful to humans?
Effects of overexposure Repeated inhalation of natural graphite over a number of years may cause scarring of the lungs with such symptoms as chest tightness, shortness of breath, cough, black sputum, and pain. Natural graphite dust causes graphite pneumoconiosis.
Can pencils be recycled?
Pencils can be recycled, as most pencils are made from recyclable materials. Wooden pencils are usually made from trees like cedar and its species; as well as graphite, metal ferrules and natural or synthetic rubber.
Does stylus scratch iPad screen?
You’ll want something that has a soft tip and does capacitive touch. My recommendation would be the Pogo stylus at Thinkgeek.com for around $14.99. It won’t damage the iPhone/iPad screen and is sort of like the ones they use in the Apple Store when they check you out. My Pogo sketch just arrived today.
How can I make my chalk better?
- Use high quality chalk pens.
- Choose the right width of pen.
- Prepare your chalk pens properly.
- Plan your design.
- Space your board with a pencil.
- Select your style carefully.
- Don’t retrace your working.
- Let your chalk dry.
- Use high quality chalk pens.
- Choose the right width of pen.
- Prepare your chalk pens properly.
- Plan your design.
- Space your board with a pencil.
- Select your style carefully.
- Don’t retrace your working.
- Let your chalk dry.
What is BB work skill?
Blackboard skill in microteaching provides clearness of perception and reinforces what’s being taught via proper visual presentation, through diagrams, notes, calculations or other similar exercises. Blackboard teaching skills in microteaching is made up of eight components.
What is the cause of friction How can we minimize it?
Friction can be minimized by using lubricants like oil and grease and by using ball bearing between machine parts. A substance that is introduced between two surfaces in contact, to reduce friction, is called a lubricant. Fluid friction can be minimized by giving suitable shapes to the objects moving in the fluids.
What will happen to a body in motion in the absence of friction?
Answer (B) the object will keep moving.