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प्रश्न
A charged glass rod attracts a charged plastic straw.
पर्याय
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.
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.
Fill in the blank.
We use ball bearings to .................. the friction.
State two factors which directly affect the force of friction.
List three ways of reducing friction.
Give three examples to illustrate that friction is a necessary evil.
State if the following statement is true or false. Correct the statement if it is false.
Like charges always attract each other.
Tick the most appropriate answer
Friction always
Tick the most appropriate answer.
Friction is offered by
Tick the most appropriate answer.
Friction produces
Fill in the blank.
Rolling friction is ........... than sliding friction.
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.
Answer the following in short.
How can sliding friction be changed into rolling friction easily?
Answer the following in detail.
Define friction and explain how it is useful to us.
Is there any possibility of making a special device to measure the magnitude of friction directly?
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.
Analogy
Objects placed at rest on earth: ______:: Bodies slide over the surface on other body: ______.
Assertion: We can live very happily if friction is not present in nature.
Reason: The airplane shape is streamlined to reduce the effort of frictional force.
