Advertisements
Advertisements
Question
When a glass rod is rubbed with a piece of silk cloth the rod ______.
Options
and the cloth both acquire positive charge.
becomes positively charged while the cloth has a negative charge.
and the cloth both acquire negative charge.
becomes negatively charged while the cloth has a positive charge.
Advertisements
Solution
When a glass rod is rubbed with a piece of silk cloth the rod becomes positively charged while the cloth has a negative charge.
Explanation:
When an object is charged by rubbing it against another object, the two objects become oppositely charged. By convention, the charge that the glass rod acquired is positive and the charge that the cloth acquired is negative. Therefore, the rod becomes positively charged, and the cloth becomes negatively charged.
RELATED QUESTIONS
Give examples to show that friction is both a friend and a foe.
Fill in the blank.
We use ball bearings to .................. the friction.
What is the cause of friction?
When you apply brakes, the bicycle stops and the rim of the wheel becomes hot? Explain the reason.
The eraser gets smaller and smaller as you use it more and more. Explain the reason.
Fill in the blank.
.................... is the SI unit of force.
State if the following statement is true or false. Correct the statement if it is false.
If two forces acting in opposite directions on a body arc of equal magnitude, then the body will not move.
Answer the following in a word or two or in a sentence.
Why does a rolling ball stop after moving some distance?
Answer the following in short.
Define force. Write its SI unit.
Answer the following in short.
What do you understand by normal force?
Tick the most appropriate answer.
Friction is offered by
Tick the most appropriate answer.
A car skids on a wet or muddy road due to
Fill in the blank.
Smoother the surface, ................. is the frictional force offered by it.
Answer the following in a word or two or in a sentence.
Name the force responsible for opposing the motion between two bodies in contact.
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?
Complete the analogy.
Knot in a thread : _____ friction : : Ball bearing : _____ friction
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.
Friction depends on the ______ of two surfaces in contact.
