Suppose three identical steel balls Q, R, and S, are plac...
Suppose three identical steel balls Q, R, and S, are placed on an undulating ground as illustrated in the diagram above. Which of the balls is/are in neutral equilibrium?
A.
S only
B.
Q only
C.
R only
D.
Q and S only
Correct answer is A
A system is in neutral equilibrium if its equilibrium is independent of displacements from its original position. A marble S on a flat horizontal surface is an example.