Final answer:
The weakest points of the spacers are at the corners of the frame due to stress concentration. Engineers reinforce these areas to prevent failure in the structure. This concept applies to various types of frames in different fields of engineering.
Step-by-step explanation:
The weakest points of the spacers are located at the corners of the frame. This is typically due to the fact that corners are stress concentration areas where the structural load is transferred through an angle change, which can create points of weakness in a material or structure. When designing frames, engineers need to consider these potential weak points and may reinforce these areas or use materials and design strategies to alleviate the stress concentration.
For example, in a rectangular frame, the corners experience a change in the direction of the material which can cause the material to have increased stress under loading conditions. Therefore, additional support or specific design considerations are often applied to these areas to enhance the durability and strength of the structure. This is true for various types of frames, including those used in construction, machinery, or even everyday items like picture frames.