Which weight movement does the sine correction curve address?

• A. Vertical weight changes
• B. Horizontal weight changes
• C. Diagonal weight changes
• D. Circular weight changes

Answer: (A)

When weight is moved along a path that isn’t perfectly vertical, gravity exerts a vertical force that changes as the orientation changes. The part of the weight that actually acts downward along the vertical direction varies with the angle, following a sine relationship. The sine correction curve is used to account for how this vertical component of weight changes as the load’s orientation changes, so it directly addresses vertical weight changes. The other directions don’t map to that same sine-driven variation in the vertical component.