Q14 of 16 Page 30

Collect information either from the internet or from books in the library, about various new techniques being adopted by human beings to reduce energy losses due to friction. Prepare a note on that.

1. Lubrication of surfaces by filling the rough uneven surfaces by a suitable lubricant reduces friction. Common lubricants are oils, powders etcetera.


2. Smoothening of the surface also helps in reducing the energy losses due to friction. This is because the interlocking between the surfaces reduce when they are smoothened. As a result of the force required to overcome friction reduces.


3. By using bearings and wheels, sliding friction can be converted to rolling friction which is much lesser than the latter.


More from this chapter

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12

Give examples of how is friction responsible for energy wastages? Give suggestions to reduce energy wastages by friction.

 13

Seetha is observing a moving bus with the luggage on its top. As the bus is moving slowly there is a change in the state of luggage on its top. But when the bus speeds up and starts moving fast, she noticed that the luggage on the top of the bus fell to the back of the bus. This raised many doubts in her mind regarding the effect of a frictional force acting on the luggage as well as on the tyres of the bus. Can you guess the questions raised in her mind? Write them.

 15

Draw a free body diagram (FBD) to show various forces acting on a body which is sliding on an inclined plane.

 16

“Reducing friction to the lowest possible level in machine tools solves the problem of the energy crisis and conserve biodiversity”. How do you support the statement? Explain?