Advertisements
Advertisements
प्रश्न
Answer the following in short.
Define force. Write its SI unit.
Advertisements
उत्तर
A push or pull acting upon an object as a result of its interaction with another object is called force. Its SI unit is the newton (N).
APPEARS IN
संबंधित प्रश्न
Give examples to show that friction is both a friend and a foe.
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 a word or two or in a sentence.
Which type of force acts on a string pulled from both ends?
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.
What do you understand by normal force?
Fill in the blank.
Weight remaining the same, friction is independent of ............. of surface in contact.
Tick the most appropriate answer.
Friction for an object can be reduced by
Complete the analogy.
Knot in a thread : _____ friction : : Ball bearing : _____ friction
Why is a ball bearing used in a cycle hub?
Assertion: Friction always opposes the motion.
Reason: Whenever one surface moves or tries to move over another surface, the force of friction starts acting on the surfaces.
