A uniformly dense rod with a length of 4 m and a mass of 6 kg is free to rotate

Question

A uniformly dense rod with a length of 4 m and a mass of 6 kg is free to rotate around a frictionless axle through the center of the rod. Three forces are acting on the rod as shown in the figure below.

What is the net torque (in Nm) acting on the rod?

A uniformly dense rod with a length of 4 m and a mass of 6 kg is free to rotate around a frictionless axle through the center of the rod. Three forces are acting on the rod as shown in the figure below.

What is the net torque (in Nm) acting on the rod?

Explanation / Answer

Given that

length L=4 m

mass m=6 kg

basing on the concept of system of properticies of rigid bodies

now we find the net torque acting on the rod

the net torque acting on the rod =mgL

=6*9.8*4

=235.2 Nm

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