Advertisements
Advertisements
प्रश्न
Sometimes, a crackling sound is heard while taking off a sweater during winters. Explain.
Advertisements
उत्तर
When we take off our sweaters in winter, we hear a crackling sound. This is because removing our sweater acquires charge due to friction between the sweater and our body. As a result, we hear a crackling sound from the sweater.
APPEARS IN
संबंधित 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.
Explain why sportsmen use shoes with spikes.
Iqbal has to push a lighter box and Seema has to push a similar heavier box on the same floor. Who will have to apply a larger force and why?
A charged glass rod attracts a charged plastic straw.
Select the correct alternative.
Friction is reduced by
Name the two kinds of forces in nature.
The eraser gets smaller and smaller as you use it more and more. Explain the reason.
Define rolling friction
Answer the following.
What do you understand by a force?
Fill in the blank.
.................... is the SI unit of force.
Answer the following in detail.
What are the various effects of force? State one example of each.
Fill in the blank.
Weight remaining the same, friction is independent of ............. of surface in contact.
Tick the most appropriate answer.
Force of friction comes into play when a/an
Tick the most appropriate answer.
If you pour some oil onto a floor, the friction would
Fill in the blank.
Bicycles use ...................... to reduce friction between the pedals and the crank
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 short.
Define rolling friction and give an example where rolling. friction comes into play.
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?
