Question

Give two examples of situations in which it is helpful to increase friction
What is a streamlined body? How is it helpful for a body to have such a shape?
How does (a) oiling and (b) using ball bearings help reduce friction?
When you push something heavy, the resistance you feel decreases as the body starts moving
Explain what happens.
(a) What is the characteristic that magnetic, electrostatic and gravitational forces have in
common?
(b) What happens when a body leaves the earth's gravitational field? Give one example,
(a) If everything in the universe attracts everything else, why do we not attract each other?
(b) Why is the moon's force of gravity less than that of the earth?​

Answer 1

Answer:

moving the body along smooth surfaces and using oil lubricants can increse the friction.

streamline body means a body having shape like aeroplane or boat.it lowers the friction b/w the fluids like air and water in this way the body will move more quickly.