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प्रश्न
A charged glass rod attracts a charged plastic straw.
विकल्प
True
False
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उत्तर
This statement is True.
Explanation:
A charged glass rod has positive charges on its surface, while a charged plastic straw has negative charges on its surface. Since unlike charges attract each other, a charged glass rod attracts a charged plastic straw.
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संबंधित प्रश्न
Friction depends on the ______ of surfaces.
When a glass rod is rubbed with a piece of silk cloth the rod ______.
Select the correct alternative.
Friction is reduced by
List three ways of reducing friction.
Give three examples to illustrate that friction is a necessary evil.
Answer the following in a word or two or in a sentence.
Why does a rolling ball stop after moving some distance?
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
State if the following statement is true or false. Correct the statement if it is false.
Friction helps us to grip the objects in our hand.
Answer the following in short.
When you push something heavy, the resistance you feel decreases as soon as the object starts moving. Explain the reason.
A moving body comes to rest due to friction alone.
Match the following.
| Column I | Column II | |
| a) | Static friction | viscosity |
| b) | Kinetic friction | least friction |
| c) | Rolling friction | objects are in motion |
| d) | Friction between the liquid layers | objects are sliding |
| e) | Sliding friction | objects are at rest |
Is there any possibility of making a special device to measure the magnitude of friction directly?
Whenever the surfaces in contact tend to move or move with respect to each other, the force of friction comes into play
In the following figure, a boy is shown pushing the box from right to left. The force of friction will act on the box
Friction depends on the ______ of two surfaces in contact.
Analogy
Objects placed at rest on earth: ______:: Bodies slide over the surface on other body: ______.
Assertion: There is a danger of a vehicle skidding on a wet road.
Reason: The tires of the vehicle lose their grip on the road due to an increase in friction due to the presence of water on the road.
