Which of the following statements about an object with a non-conservative force
ID: 1337062 • Letter: W
Question
Which of the following statements about an object with a non-conservative force acting on it is wrong?
Select all that may apply
A. If the object moves from point A to point B, and then back from B to A, then the work done by the non-conservative force is always zero
B. The total energy of the object might not be conserved.
C. If this force is the only force acting on the object then the work-energy theorem is valid, i.e. the work done by this force is equal to the change in kinetic energy of the object.
D. Work done by this force between two points A and B generally depends on the path taken between A and B.
Explanation / Answer
A)
WRONG
from A to B work done by a frictional force = wAB = -f*AB
from B to A = wBA = -f*BA
total = -2*f*AB which is ot equal to zero
(B)
TRUE
(C)
TRUE
from work energy hteorem total work done = change in kE
(D)
TRUE
+++++++++++++++++++++++
only A is wrong
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