Advertisements
Advertisements
Question
Give examples to show that friction is both a friend and a foe.
Advertisements
Solution
Examples to show that friction is a friend:
- Friction enables us to grip and catch various objects.
- It allows us to walk pleasantly on the surface.
- It helps reduce the speed of moving items.
- It will enable us to write on paper or blackboards.
- Friction prevents objects from moving from their original positions.
Examples to show that friction is a foe:
- Friction wears and tears items.
- It damages machine parts.
- Machines and tools require constant maintenance, which wastes a lot of money.
- It slows down moving objects, requiring more significant force.
- It prohibits the free movement of items.
RELATED QUESTIONS
Suppose your writing desk is tilted a little. A book kept on it starts sliding down. Show the direction of frictional force acting on it.
A charged glass rod attracts a charged plastic straw.
Select the correct alternative.
Friction is reduced by
Give an example to illustrate the existence of the force of friction.
What is the cause of friction?
Define sliding friction
State if the following statement is true or false. Correct the statement if it is false.
Like charges always attract each other.
Answer the following in short.
Define force. Write its SI unit.
Tick the most appropriate answer
Friction always
Tick the most appropriate answer.
Friction is offered by
Fill in the blank.
Friction depends upon the ............... of an object.
State if the following statement is true or false. Correct the statement if it is false.
Friction has no relation with our walking or running.
State if the following statement is true or false. Correct the statement if it is false.
Friction is offered by all the three states of matter.
Answer the following in a word or two or in a sentence.
Name a method used to reduce friction.
Answer the following in short.
Define rolling friction and give an example where rolling. friction comes into play.
Answer the following in short.
How can sliding friction be changed into rolling friction easily?
Answer the following in short.
List the various states of matter that offer frictional force?
How do you feel when you touch a nail immediately after it is hammered into a wooden plank? Why?
Analogy
Objects placed at rest on earth: ______:: Bodies slide over the surface on other body: ______.
