In disc harrow mechanics, to maintain a uniform depth of cut across all discs in a gang, the moment produced by the horizontal soil forces must be balanced by the moment of the vertical downward force about the center of the gang:

• Overturning moment caused by horizontal soil thrust (\(H\))\lt /strong\gt : \[ M_H = H \times y = 1200\text{ N} \times 20\text{ cm} = 24,000\text{ N}\cdot\text{cm} \]
• Balancing moment by downward vertical force (\(W\)) acting at distance \(x\)\lt /strong\gt : \[ M_W = W \times x = 2400\text{ N} \times x \]
• Setting the moments equal for rotational equilibrium:
  \[ 2400 \times x = 24,000 \implies x = \frac{24,000}{2400} = 10\text{ cm} \]