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A worker must carry 25 kg bags of sand from a packing machine to a dispatch zone (approximately 10 m in distance). When carried upright, the centre of gravity (COG) of the bag is approximately 15 cm from the lumbosacral (LS) joint. The same worker is then tasked with carrying 25 kg bags of feather. The bags are stored in the bottom shelf and the worker must hunch down to pick up the bag. You found that the COG of the bag in this position is approximately 70 cm from the LS joint whereas the COG of the upper body is then located 20 cm from the LS joint. How do you calculate the total compressive force on the spine at L5/S1 if the upper body of the worker is 30 kg and the back muscles act at an average distance of 5 cm from the fulcrum at the L5/S1 junction for the two scenarios above ?

A worker must carry 25 kg bags of sand from a packing machine to a dispatch zone (approximately 10 m in distance). When carried upright, the centre of gravity (COG) of the bag is approximately 15 cm from the lumbosacral (LS) joint. The same worker is then tasked with carrying 25 kg bags of feather. The bags are stored in the bottom shelf and the worker must hunch down to pick up the bag. You found that the COG of the bag in this position is approximately 70 cm from the LS joint whereas the COG of the upper body is then located 20 cm from the LS joint. How do you calculate the total compressive force on the spine at L5/S1 if the upper body of the worker is 30 kg and the back muscles act at an average distance of 5 cm from the fulcrum at the L5/S1 junction for the two scenarios above ?

International Edition---engineering Mechanics: Statics, 4th Edition
International Edition---engineering Mechanics: Statics, 4th Edition
4th Edition
ISBN:9781305501607
Author:Andrew Pytel And Jaan Kiusalaas
Publisher:Andrew Pytel And Jaan Kiusalaas
Chapter7: Dry Friction
Section: Chapter Questions
Problem 7.35P: The weight of the cylindrical tank is negligible in comparison to the weight of water it contains...
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A worker must carry 25 kg bags of sand from a packing machine to a dispatch zone (approximately 10 m in distance). When carried upright, the centre of gravity (COG) of the bag is approximately 15 cm from the lumbosacral (LS) joint. The same worker is then tasked with carrying 25 kg bags of feather. The bags are stored in the bottom shelf and the worker must hunch down to pick up the bag. You found that the COG of the bag in this position is approximately 70 cm from the LS joint whereas the COG of the upper body is then located 20 cm from the LS joint. How do you calculate the total compressive force on the spine at L5/S1 if the upper body of the worker is 30 kg and the back muscles act at an average distance of 5 cm from the fulcrum at the L5/S1 junction for the two scenarios above ?
Transcribed Image Text:A worker must carry 25 kg bags of sand from a packing machine to a dispatch zone (approximately 10 m in distance). When carried upright, the centre of gravity (COG) of the bag is approximately 15 cm from the lumbosacral (LS) joint. The same worker is then tasked with carrying 25 kg bags of feather. The bags are stored in the bottom shelf and the worker must hunch down to pick up the bag. You found that the COG of the bag in this position is approximately 70 cm from the LS joint whereas the COG of the upper body is then located 20 cm from the LS joint. How do you calculate the total compressive force on the spine at L5/S1 if the upper body of the worker is 30 kg and the back muscles act at an average distance of 5 cm from the fulcrum at the L5/S1 junction for the two scenarios above ?
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