Which of the following statements regarding the forces acting on a tillage tool is/are CORRECT?
Options:
(A) Draft is the horizontal force component acting parallel to the direction of travel
(B) Side force acts horizontally perpendicular to the line of motion
(C) Specific draft is defined as total draft per unit furrow cross-sectional area
(D) Draft of a tillage implement is completely independent of the operating forward speed
Answer Key:
A, B, C
Step-by-Step Solution & Explanation
Tillage Tool Forces (Kepner et al.):
- **A is TRUE**: Draft is parallel to travel direction.
- **B is TRUE**: Side force is perpendicular to travel direction.
- **C is TRUE**: Specific draft ($N/cm^2$) = Draft / Area.
- **D is FALSE**: Draft increases with the square of speed ($D = a + b v^2$).
Correct options: **A, B, C**.