Question

Horizontal component of pull parallel to the line of motion is called

• A. Draft
• B. Resistance
• C. Line of force
• D. Center of Power

Hint:

Draft (\(H = P \cos\theta\)) is the horizontal force that must be overcome to pull an agricultural implement forward.

Answer 1

The Correct Option is A

Step 1: Understanding the Concept:
In agricultural engineering, tillage implements require a pulling force to move through the soil.
The physics of this pulling action involves resolving forces into vertical and horizontal components.
Key Formula or Approach:
The pulling force (\(P\)) exerted on an implement is directed along the line of pull.
If the pull is exerted at an angle (\(\theta\)) to the horizontal ground plane:
- The horizontal component of this force, parallel to the direction of travel, is given by:
\[ H = P \cos\theta \] - The vertical component is given by:
\[ V = P \sin\theta \]

Step 2: Detailed Explanation:
In tillage mechanics, the horizontal component of the pulling force parallel to the line of motion is defined as the Draft (or draught) of the implement.
The draft represents the actual power required to overcome soil resistance, cut and deform the soil slice, and move the implement forward.
It is a critical parameter for determining the size of the tractor or draft animal power needed to operate a given tillage implement.

Step 3: Final Answer:
The horizontal component of pull parallel to the line of motion is called Draft.