In which of the following cases the friction is helpful (H) and troublesome (T)?(a) Lighting a matchstick(b) Applying the brakes on a cycle(c) Use a towel to open tightly closed lid of a bottle(d) Pulling drawer out of a desk

In which of the following cases the friction is helpful (H) and troubl

1.	In which of the following cases the friction is helpful (H) and troublesome (T)?(a) Lighting a matchstick(b) Applying the brakes on a cycle(c) Use a towel to open tightly closed lid of a bottle(d) Pulling drawer out of a desk
A.	(a)(b)(c)(d)TTHH
B.	(a)(b)(c)(d)HHTT
C.	fibrous roots
D.	(a)(b)(c)(d)HHHT
Answer» E.

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In which of the following cases the friction is helpful (H) and troublesome (T)?(a) Lighting a matchstick(b) Applying the brakes on a cycle(c) Use a towel to open tightly closed lid of a bottle(d) Pulling drawer out of a desk

In which of the following cases the friction is helpful (H) and troublesome (T)?(a) Lighting a matchstick(b) Applying the brakes on a cycle(c) Use a towel to open tightly closed lid of a bottle(d) Pulling drawer out of a desk

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