Question

Shown below are different forms for a step-stool. Which of the forms will remain stable when a person is standing on the top step?

• A.

  

• B.

  

• C.

  

• D.

  

Answer 1

The Correct Option is A, D

To determine which step-stool forms remain stable when a person stands on the top step, we need to consider the following criteria:

• Base of Support: A wider base offers better stability as it ensures the center of gravity remains within the support area.
• Center of Gravity: A lower center of gravity, typically found in stools with broader bases, contributes to enhanced stability.

Analyzing the options provided:

This form has a wide base and appears stable, reducing the risk of tipping over. Therefore, it is stable.

This form has a narrow base, which can increase the risk of tipping if the person shifts their weight. Thus, it is less stable.

This form also lacks a wide base, making it less stable than those with wider support structures.

This form shows a wide base with additional support, ensuring good stability for a person standing on the top step.

Therefore, the stable forms are:

• 

•