Question 7
Equilibrium of ForcesThe diagram above represents balls in an undulating surface. Which of the following options represents positions of stable equilibrium?
- A.II, V and VIII
- B.I, IV and VII
- C.III, VI and IX
- D.III, IV and VIII
Show the answer and explanation
Answer: C (III, VI and IX)
Explanation
A ball resting in a hollow (trough) returns there if displaced, so it is in stable equilibrium. Balls iii, vi and ix sit in the troughs.