IAS interview of tirumala taken by the fourth member of the panel
M4: Ok, tirumala have you seen the roads and the highways? Tiru: yes sir, M4: How are they? Tiru: good sir. M4: No I mean, what is the shape, convex, concave or straight...how does it look like. (makes shapes with hands and shows) Tiru: (I make my hands convex and show the shape): Sir it is convex. M4: What's that called? Tiru: Banking....no sir, it is not banking....I am sorry I don't know. M4: It is called camber. Tiru: thank you sir. M4: Now tell me, why is this camber there? Tiru: I am not sure sir. M4: Take a guess. Tiru: Maybe sir because the wheels give loads on ends of the roads and over a period of time....X M4: No no that's not the reason. Tiru: I am sorry sir, I don't know. M4: It is for drainage purposes. That way, the water will flow sidewards and not collect at the centre. Tiru: yes sir, that's logical. Thank you sir. M4: Why is banking given on turns? Tiru: To avoid vehicles from toppling over or skidding while taking a turn. M4: and why does vehicle topple or skid? Tiru: Sir the centrifugal force acting on the vehicle makes them do so. The reaction force tries to balance the centrifugal force acting inwards and when centrifugal force is more the vehicle topples. M4: Centrigual force acts inwards? Tiru: mmmmm... M4: How does the vehicle topple? Tiru: Outwards M4: Then how should the centrifugal force act? Tiru: yes sir, I was wrong, it actually acts outwards and in fact centripetal is the one acting inwards. M4: Think again. I think you were right earlier. Tiru: (I was really confused now...and though i knew i was wrong earlier but i took a moment here. All the members on the board broke into smiles and started laughing slowly. I too looked at them and we all laughed): Sir...X M4: So you are confused. Tiru: Sir I accept that I am confused.
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