Homework SourseThe figure below depicts three different scenarios for lifti
The figure below depicts three different scenarios for lifting a weight. Calculate the moment on the base of the spine for each one.
Lw 50 LBS 50 LBS 50 LBS 45 LBS 45 LBS 45 LBS Lw= 10 IN LP = 16 IN LW = 7 IN LP-14 IN LP= 12 INSolution
Moment on the base of spine due to forces in the left most figure case.
Moment of the 50 lbs force = 50 lb*Lw = 50 lb* 1 in = 50 lb-in
Moment of the 45 lbs force = 45 lb*Lp= 45 lb*12 in = 540 lb-in
Total moment on the base of spine = 50+540 = 590 lb-in.
Moment on the base of spine due to forces in the middle figure case.
Moment of the 50 lbs force = 50 lb*Lw = 50 lb* 10 in = 500 lb-in
Moment of the 45 lbs force = 45 lb*Lp= 45 lb*16 in = 720 lb-in
Total moment on the base of spine = 500+720 = 1220 lb-in.
Moment on the base of spine due to forces in the right most figure case.
Moment of the 50 lbs force = 50 lb*Lw = 50 lb* 7 in = 350 lb-in
Moment of the 45 lbs force = 45 lb*Lp= 45 lb*14in = 630 lb-in
Total moment on the base of spine = 350+630 = 980 lb-in.
