DE SU useful.
61. Why are lubricants (oil or grease) applied to rubbing su
om or grease) applied to rubbing surfaces of machine
62. Explain with the help of diagrams, how the use of oil reduces the
with each other.
grams, how the use of oil reduces friction be
63. Why are cars, aeroplanes and rockets streamlined?
64. Explain why, a speedboat has a streamlined shape.
6. What are fluids ? Name two common fluids.
Long Answer Type Questions
66. Define friction. What are the factors affecting friction ? Explain with ex
(b) What is the cause of friction ? Explain with the help of a labelled diagr
67. @ Give examples to show that friction depends on the nature of two surf
Give an example to show that friction depends on the force with whic
together.
Answers
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Answer: Rubricants are applied to rubing surfaces to avoid friction of the surfaces which if not avoided may cause fire due to heat caused by the rubing surfaces
Explanation:
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