Q16 of 16 Page 30

“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?

We know that friction increases the wastage of energy in devices. More is the friction, more energy is used to make the device overcome friction to do some work. If a device is run by fuel then in case of excess friction, it requires huge amounts of fuel to provide more energy. By lessening the frictional force, it is possible to reduce energy consumption thus paving way for conservation of biodiversity. ( As fuel is obtained from trees and fossils.)


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.

 14

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.

 15

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