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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