Respected Sir/Mam,

I am Pratik of class 9 and wanted some help regarding my holiday homework given in my school. The question is as follows:

Write a paragraph regarding hazads of frictional force in operation of machines and please pay special attention to ball bearings and lubricating agents used in machines.

Please help as soon as possible........

Regards,

Pratik.

Frictional force,being nessecary,is also hazardous in several cases.It jams the moving object like handles of doors,brakes of cycles,etc.it also reduces speeds of moving objects like cars,areoplanes,etc.

This can be prevented by many methods.To increase speed overcoming friction,cars and areoplanes are streamlined.Ball bearings are applied on moving objects to decrease friction as rolling friction is least.Lubricating agents are used to recover jamed objects as they form a layer between the two moving objects.

thumbs up..........