Final answer:
To decide the axis of rotation in a system, we need to consider the characteristics of the system and the problem at hand to choose an axis that simplifies the analysis and application of rotational motion laws.
Step-by-step explanation:
In order to decide the axis of rotation in a system, we need to consider the characteristics of the system and the problem at hand. The choice of the axis of rotation should simplify our analysis and make it easier to apply the laws of rotational motion. For example, if we have a symmetric object, like a sphere, it might be convenient to choose an axis of rotation that passes through its center.
Alternatively, if we have an object with an irregular shape, we can choose an axis of rotation that goes through a fixed point on the object, such as a corner or an edge.
It is important to carefully consider the problem at hand and choose an axis of rotation that best suits the situation and simplifies our calculations.