Which of the following statements is/are correct about work?

Options

A. (a) In a certain reference frame,
`W_("pseudo force")+W_("conservative force")+W_("non-conservative force")+W_("other forces")=DeltaK`
B. (b) Work done by friction is always negative.
C. (c) Work done by a force is defined as the dot product of the force and the displacement of the point of application of force.
D. (d) Work done by conservative force in moving a body from A to B =potential energy of the body at A-potential energy of the body at B.

Answer

A, C, D

Explanation

Work done by friction can be negative, zero or positive. Hence, (b) is incorrect, All others are correct.