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प्रश्न
Complete the analogy.
Knot in a thread : _____ friction : : Ball bearing : _____ friction
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उत्तर
Knot in a thread : Increase friction : : Ball bearing : Reduces friction
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संबंधित प्रश्न
Name the two kinds of forces in nature.
Define sliding friction
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.
Fill in the blank.
Weight remaining the same, friction is independent of ............. of surface in contact.
Tick the most appropriate answer.
A car skids on a wet or muddy road due to
Tick the most appropriate answer.
If you pour some oil onto a floor, the friction would
Fill in the blank
Rolling friction is ............. than sliding friction.
Answer the following in a word or two or in a sentence.
Name a method used to reduce friction.
Answer the following in short.
How can sliding friction be changed into rolling friction easily?
Analogy
Objects placed at rest on earth: ______:: Bodies slide over the surface on other body: ______.
