Which method is NOT helpful for increasing stability?

Increasing stability is fundamentally about ensuring that an object or body remains in a balanced position, especially when subjected to external forces. One effective way to enhance stability is by lowering the center of gravity. This action makes it harder for external forces to cause a tipping effect, thereby keeping the object more stable.

Extending the base of support in the direction of the force also improves stability by providing a greater area to resist that force, making it less likely for the object to topple. Additionally, increasing friction between surfaces further enhances stability by preventing slipping and allowing for better control over movements.

In contrast, raising the center of gravity does the opposite—it increases the likelihood of losing balance. A higher center of gravity makes an object more susceptible to tipping when faced with forces or movements. Thus, among the methods outlined, raising the center of gravity is the least effective in promoting stability, aligning with the correct answer to the question.