Question

II. Fill in the Blanks
Fill in the blanks with suitable word/s.
1. Sliding friction is ___________ than static friction.
2. Friction can be reduced by using ___________.
3. Friction can be increased by making surface ___________.
4. Rolling friction is ___________ than sliding and static friction.
5. Friction due to fluid is also called ___________.
6. Bodies of birds, fishes and ships are ___________.
7. Friction can also produce ___________.
8. All objects moving in fluids have ___________ shape to reduce ___________.
9. Rough surfaces produce ___________ friction than smooth surfaces.
10. In many machines, friction is reduced by using ___________.
11. Friction depends on the ___________ of substances in contact.
12. Static friction comes into play when we try to move an object at ___________.
13. ___________ force is responsible for downward movement of a parachutist when he jumps from an aircraft
14. The sole of shoes and the tyres of vehicles are treaded to _________ friction.
15. Friction is sometimes _________ .

Answer 1

Answer:

1. less than static

2.greasing or oiling

3.rough

4.less

6.streamlined

7. heat

9. more

10. oiling

11. surface

14.reduce

15 . disadvantageous