Which of the following factors isn't part of the lifting equation and therefore doesn't contribute to the possible strain caused by lifting?

Answer

The correct answer is 'The strength of the lifting person'. In ergonomic assessment tools like the NIOSH lifting equation, the mechanical strain is evaluated based on external physical factors of the lift, such as the weight of the object being lifted, the vertical height of the hands from the ground, and the horizontal distance of the hands from the body. An individual's personal physical strength is not a variable in calculating the physical strain or recommended weight limit of a lift using the standard lifting equation.