Question

Q I. Answer in one word:
1. The frictional force ----------- with increase in weight of the body.
2. Ball bearing reduces the wear and tear of ______ parts of machine.
3. Fluid friction can be minimised by giving suitable --------------- to bodies
moving in fluid.
4. What is the specific name of fluid friction?

Q II. Answer in brief: -
5. Give reason sliding friction is less than static friction.

6. What is stream line shape? How does it help to reduce fluid friction?

7. Why do we say friction is a necessary evil? Define the term wildlife

Answer 1

1. diagram
2. discovered
3. difference
4. database