Advertisements
Advertisements
प्रश्न
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.
Advertisements
उत्तर
When a book slides on the writing desk, a frictional force acts between the book and the surface of the desk. The direction of the frictional force on the book is opposite to the direction of its motion and acts upward, as shown in the following figure.
APPEARS IN
संबंधित प्रश्न
Give an example to illustrate the existence of the force of friction.
Name the three kinds of friction.
The eraser gets smaller and smaller as you use it more and more. Explain the reason.
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 a word or two or in a sentence.
Which type of force acts on a string pulled from both ends?
Answer the following in short.
Define force. Write its SI unit.
Answer the following in detail.
What are the various effects of force? State one example of each.
Fill in the blank.
Sliding friction and rolling friction are types of .................. friction.
Tick the most appropriate answer.
Force of friction comes into play when a/an
Tick the most appropriate answer
Friction always
Tick the most appropriate answer.
Friction is offered by
Fill in the blank.
Friction is a type of .................
Answer the following in a word or two or in a sentence.
Why is difficult for a pen to leave a mark on a highly smooth plastic sheet?
Answer the following in short.
Define rolling friction and give an example where rolling. friction comes into play.
Answer the following in detail.
Define friction and explain how it is useful to us.
Answer the following in detail.
Describe three different ways by which friction can be increased to help us in various situations?
A moving body comes to rest due to friction alone.
We have two identical metal sheets. One of them is rubbed with sand paper and the other with ordinary paper. The one rubbed with sand paper shines more than the other. Give reason.
Complete the analogy.
Knot in a thread : ______ friction :: Ball bearing : ______ friction.
