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प्रश्न
Answer the following in a word or two or in a sentence.
Which type of force acts on a string pulled from both ends?
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उत्तर
Tension (contact force)
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संबंधित प्रश्न
When a glass rod is rubbed with a piece of silk cloth the rod ______.
A charged glass rod attracts a charged plastic straw.
Give three examples to illustrate that friction is a necessary evil.
A body needs a force F1 just to start moving on a surface, a force F2 to continue its motion and a force F3 to roll on the surface. What is
- the static friction
- sliding friction and
- rolling friction? State whether F2 is equal, less than or greater than (1) F1 and (2) F3.
Answer the following in short.
Define force. Write its SI unit.
Fill in the blank.
The force of friction acting between two bodies in contact while at rest is known as ................ 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.
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: 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.
