For lifting a 19.3 kg object, calculate the compressive reaction force, FV , that is transmitted to the pivot point of the spine (at the level of the hips) by the vertebrae of the lower back.
For lifting a 19.3 kg object, calculate the compressive reaction force, FV , that is transmitted to the pivot point of the spine (at the level of the hips) by the vertebrae of the lower back.
College Physics
11th Edition
ISBN:9781305952300
Author:Raymond A. Serway, Chris Vuille
Publisher:Raymond A. Serway, Chris Vuille
Chapter1: Units, Trigonometry. And Vectors
Section: Chapter Questions
Problem 1CQ: Estimate the order of magnitude of the length, in meters, of each of the following; (a) a mouse, (b)...
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For lifting a 19.3 kg object, calculate the compressive reaction force, FV , that is transmitted to the pivot point of the spine (at the level of the hips) by the vertebrae of the lower back.
Transcribed Image Text:When picking up an object from the ground, it is generally recommended that you "lift with your legs" - that is, raise and lower yourself
by bending your knees but keeping your upper body upright. If instead, you "lift with your back" by bending at the hip so that your upper
body is angled, then you put a great deal more stress on your spine and back muscles. Consider a person who is "lifting with their
back" such that they are bent at the hip with their upper body is parallel to the ground (i.e., their spine is oriented horizontally). Let us
calculate the tension in the back muscles and the compression on the spine in this situation. We will model the spine and upper body
as a horizontal rigid rod or uniform density with a length of 50.0 cm and a mass of 40.0 kg. Assume that the person attempts to lift an
object with their arms, which we will model as attached at the far end of the rod. Support of the back in this position is provided
primarily by the erector spinalis muscle which we will model as being attached at one end to the spine at a point 33.0 cm from the hip
at an angle of 10 degrees; the other end of the muscle is attached to the lower body below the hip.
F.
R.Y
T
F₁ = FRx
0 = 10°
F
Image size: S M L Max +
9. u.b.
F
g, obj
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