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प्रश्न
How do you feel when you touch a nail immediately after it is hammered into a wooden plank? Why?
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उत्तर
The nail becomes hot due to friction. Friction changes kinetic energy to heat.
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संबंधित प्रश्न
When you apply brakes, the bicycle stops and the rim of the wheel becomes hot? Explain the reason.
Arrange the following in descending order:
- static friction
- sliding friction and
- rolling friction?
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 always
Answer the following in short.
How can sliding friction be changed into rolling friction easily?
Answer the following in detail.
Describe three different ways by which friction can be increased to help us in various situations?
Friction depends on the ______ of two surfaces in contact.
Analogy
Objects placed at rest on earth: ______:: Bodies slide over the surface on other body: ______.
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.
