Question

Shown below is the view and cross-section of a seat belt used in aeroplanes. Part X has four different components P, Q, R, and S. How many springs are required to be fixed on the part S to make the seat belt work?

Hint:

In mechanical systems, carefully examine the diagrams to identify the functionality of each part and determine the minimum components needed for proper operation.

Answer 1

Step 1: Analyze the function of the seat belt mechanism.
- The seat belt system relies on part S for maintaining tension and allowing controlled movement.
- The spring is essential for enabling the locking and unlocking function of the belt.
Step 2: Examine the role of part S in the diagram.
- From the cross-section, it is clear that part S is responsible for returning the belt to its original position after it is extended.
- To achieve this functionality, only one spring is necessary to provide the required tension.
Step 3: Conclude the number of springs.
The seat belt mechanism requires:
\[ {1 \text{ spring on part S}}.\]