Who Is Carrying the Most Weight? 🤔

At first glance, it looks like A, B, and C are sharing the load equally. But physics tells us otherwise.

🧠 The answer: A

The concrete block is hanging from the left side of the beam, very close to A. Because A is closest to the load, it experiences the greatest share of the supporting force.

Think of the beam as a lever. The load creates a turning effect (torque) about each person’s position. The closer a support is to the load, the more directly it has to resist that load.

So, approximately:

A > B > C

in terms of the load carried.

⚖️ Why?

The downward force from the concrete block has to be balanced by upward forces from the three people. The beam also has to remain in rotational equilibrium:

[
\sum F = 0
]

and

[
\sum \tau = 0
]

Since A is closest to the hanging weight, the load is concentrated more heavily on A, while B and C provide progressively less support.

🚨 One important physics caveat

Strictly speaking, with three people supporting a perfectly rigid beam, the exact force on each person cannot be determined from simple equilibrium equations alone. Their positions, the beam’s flexibility, and how each person responds to the beam all matter.

But for the intended conceptual puzzle, the takeaway is: