Question

the 30kg boy stands on a horizontal plank 1m from one end and 2m from the other. the plank is uniform and has a mass of 10kg. calculate the force

Answer 1

Task:

The 30kg boy stands on a horizontal plank 1m from one end and 2m from the other. The plank is uniform and has a mass of 10kg. Calculate the force.

Solution:

$M_P$ -momentum diagram from external load

$M_{w}$ -momentum diagram from dead load

$Q_{P}$ - shear force diagram from external load

$Q_{w}$ - shear force diagram from dead load

$Q$ - shear force diagram from total load

$[Q] = [1kg] = [9.80665N]$