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Adding moments and the resultant moment

The resultant moment is the sum of all the different moments on a body.

The resultant moment in the clockwise direction is equal to the sum of the all clockwise moments minus the sum of all the anti-clockwise moments.

The resultant moment in the anti-clockwise direction is equal to the negative of the resultant moment in the clockwise direction direction.

The weight of the load in the wheelbarrow causes a clockwise moment of $$\Tblue{100\text{ N}} \times \Tred{0.18 \text{ m}} = \Tblue{18 \text{ Nm}}.$$

The force applied by the person holding up the wheelbarrow causes an anti-clockwise moment of $$\Tgreen{30\text{ N}} \times \Tred{0.5 \text{ m}} = \Tgreen{15 \text{ Nm}}.$$

The resultant moment is $$\Tblue{18 \text{ Nm}} - \Tgreen{15 \text{ Nm}} = 3 \text{ Nm}$$ clockwise. The person cannot support the load and the wheelbarrow falls to the ground.