" Work done by static friction on an object "

Work down by static friction on an object :

Work down by static friction on an object :

The static friction

STATEMENT-1 Work done by static friction in any reference frame is zero STATEMENT-2 If work done on the body is positive its kinetic energy increases.

STATEMENT-1 Work done by static friction in any reference frame is zero STATEMENT-2 If work done on the body is positive its kinetic energy increases.

Work done by kinetic friction can be

Work done by static friction on a body in an inertial frame: (A) must be +ve (B) must be -ve(c) must be zero (D) may be-ve

Consider following statement (A) Work done by pseudo force in non-inertial frame itself cannot be positive (B) Net work done by static friction on the system (consisting surfaces I contact) is always zero (C) Net work done by Kinetic friction on the system (consisting surfaces in contact) may be positive (D) Work done by kinetic friction on a body may be positive Select correct alternative :-

Consider following statement (A) Work done by pseudo force in non-inertial frame itself cannot be positive (B) Net work done by static friction on the system (consisting surfaces I contact) is always zero (C) Net work done by Kinetic friction on the system (consisting surfaces in contact) may be positive (D) Work done by kinetic friction on a body may be positive Select correct alternative :-