Explain why:
(a) A pencil will write on paper but not on glass.
(b) climbing a greasy pole is very difficult.
Answers
Answer:
paper is said to have more friction than a glass so the particles of lead stick very easy to paper than glass
for B) it is difficult to climb the greasy pole because it is a lubricant which reduces friction.
that is why it is used to run motors,engines etc...
Friction helps
Explanation:
Friction is a phenomenon which resists motion when an object is rubbed against another. So friction has instances where it is desired and instances where it is not desired.
Friction helps and is hence desirable when drawing, walking, driving or picking up fallen objects. However, it is not desirable when it causes us to slip while walking or climbing when the presence of oil or water reduces friction. We need friction to get a better grip on objects.
(a) A pencil will write on paper but not on glass, as glass has less friction than paper.
(b) Climbing a greasy pole is very difficult as the grease acts as a lubricant and reduces friction, causing us to slip.