Final answer:
The statement that rigid elements are assumed to be infinitely strong is false; they are an idealization used in physics to describe bodies that do not deform under any force, but all real materials have limits to their strength.
Step-by-step explanation:
When we say something is a rigid element in physics, we are working with an idealization that assumes it can withstand any force without deformation. However, the statement that rigid elements are assumed to be infinitely strong is false. While ideal rigid bodies are infinitely stiff, in reality no material is infinitely strong or perfectly rigid. The concept of a rigid body is a useful simplification for solving certain physical problems without getting into the complexities of material strength.
In physics, we often make similar simplifications to grasp the basic principles of how things work. This approach is particularly useful in classical mechanics where materials are often assumed to be perfectly rigid to simplify the mathematical analysis of a system.