Physics - W.E.P. Question with Solution | TestHub
List-I gives work done by the forces and List-II represents its effect on the system. Match the correct order.
List - I | List - II |
|---|---|
(P) Work done by all the forces is positive | (1) KE must decreases |
(Q) Work done by internal conservative force is negative. No information about work of other forces | (2) Mechanical energy of system decreases |
(R) Work done by external forces is negative (assume there is no non-conservative force) | (3) K.E must increases |
(S) Work done by all the force is negative | (4) P.E. of system increases |
Options:
Answer:
Solution:
(P) Work of all forces positive - KE must increase (3).
(Q) Internal conservative work negative means - PE increases (4).
(R) External work negative with no non-conservative force - mechanical energy decreases (2).
(S) Work of all forces negative - KE must decrease (1).
P-3, Q-4, R-2, S-1. Ans. (C)
