Which of the following statements are TRUE about frictional force? i. it is always a disadvantage ii. it is sometimes a disadvantage iii. it always exist where there is a relative motion of two bodies that are in contact iv. it is sometimes very useful
i, iii only
i, iv only
ii, iii only
iii, iv only
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Discussions (17)
I think Ii and IV should be an option.
Friction does not act of a smooth surface despite it being in contact
Myschool ii and iv are also correct cos force act wen there is a relative motion between two surfaces in contact
II, III, IV Are correct.
Option C and D are correct.
Which one exactly do they want??
correct option here is
ii &iv
i ) is off because its not always disadvantage
iii) is off because it does not always exist between two bodies in contact with a relative motion . it occures when the surface is rough
so ii and iv
is very good to go
TRUE Statements:
ii. It is sometimes a disadvantage
Example: Friction causes wear in machine parts, reducing efficiency.
iii. It always exists where there is a relative motion of two bodies that are in contact
Friction opposes relative motion between surfaces in contact (kinetic friction).
iv. It is sometimes very useful
FALSE Statement:
i. It is always a disadvantage
Not true! While friction can be undesirable (e.g., energy loss in engines), it is also essential for many daily activities.
Example: Friction allows walking, driving (tire grip), and holding objects.
But since the options are two. i would go iwth ii and iii.
How do i understand it, i studied using studyhawkx.
