Problem: A 37 kg , 5.0-m-long beam is supported, but not attached to, the two posts in the figure. A 20 kg boy starts walking along the beam. How close can he get to the right end of the beam without it falling over?

FREE Expert Solution

The conditions for static equilibrium:

ΣF=0

and 

Στ=0

Let d be the distance from the second post the boy walks without the beam falling.

The distance between the center of the beam and the second post is (3.0-2.5 = 0.50m). M is the mass of the beam, and m is the mass of the boy. 

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Problem Details

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A 37 kg , 5.0-m-long beam is supported, but not attached to, the two posts in the figure. A 20 kg boy starts walking along the beam. 

How close can he get to the right end of the beam without it falling over?

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What scientific concept do you need to know in order to solve this problem?

Our tutors have indicated that to solve this problem you will need to apply the Torque Due to Weight concept. You can view video lessons to learn Torque Due to Weight. Or if you need more Torque Due to Weight practice, you can also practice Torque Due to Weight practice problems.