Question Bank • QB_FM_075 NAT • 2 Marks

Section 2: Farm Machinery

Farm Machinery

Subtopic: Soil tillage

Question Statement:

A trailed disc harrow with 16 discs has a total weight of $800\text{ kg}$. The gang angle is adjusted to $20^\circ$. If the coefficient of rolling resistance of the discs is $0.22$, calculate the pulling force in $\text{N}$ required to overcome rolling resistance on level ground. (Take $g = 9.81\text{ m/s}^2$)

Answer Key:

1726.56

Step-by-Step Solution & Explanation

Total weight of the harrow $W = 800\text{ kg} = 800 \times 9.81 = 7848\text{ N}$. Rolling resistance force: $R = \mu_r \times W = 0.22 \times 7848 = 1726.56\text{ N}$
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