Question

Q: Fill in the blanks with suitable words.
1. Friction is caused by the ________ of the two surfaces in contact.
2. The body of a fish or a bird is ________.
3. Use of ________ reduces the friction in machines.
4._________ friction is less than sliding friction.
5._________ includes both liquids and gases.
6.__________ offers the least force of friction.
7. Force of friction depends on the smoothness or_______ of a surface. 8.________ helps to write and light a matchstick.
9. A ________ is a machinery part containing small metal balls.

Answer 1

Answer:

1. interlocking

2. streamlined

3. lubricants / oil

4. rolling friction

5. fluids

6. polished floor

7. roughness

8. Friction

9. bearing

Explanation:

Answer 2

Answer:

1 interlocking

2 streamlined

3 lubricants

4 rolling friction

5 fluid

6 polished floor

7 roughness

8 friction

9 bearing

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