Select T-True, F-False, for each statement. A) The kinetic energy can be negativ
ID: 1777560 • Letter: S
Question
Select T-True, F-False, for each statement.
A) The kinetic energy can be negative.
B) If the moon revolves around the earth in a perfectly circular orbit, then the earth does not do any work on the moon.
C) The kinetic energy of an object does not depend on the direction of the motion involved.
D) While kinetic friction acts on it, an object moves such that it ends in the same place it started. The total work done by the friction during this motion can be zero.
E) Work cannot be done in the absence of motion.
F) The work done to raise a box onto a platform does not depend on how fast it is raised.
Explanation / Answer
(A) False: Because mass and square of velocity are +ve
(B) True: In such case, motion will be uniform circular motion and there is no change in kinetoc energy of moon
(C) True: Because kinetic energy is half of the mass time of dot product of velocity. and dot product between same vector is always +ve
(D) False: Kinetic friction is not a conservative force hence work done by it depends on the path and hence there will non-zero work done even the displacement is zero.