The cycle continues as the mass vibrates back and forth about a fixed position. The springs inside of a bed mattress, the suspension systems of some cars, and bathroom scales all operated as a mass on a spring system. In all the vibrating systems just mentioned, damping is clearly evident.
[Continued from above] . . . Contraction of the quadriceps group extends the leg at the knee and flexes the thigh at the hip. The hamstring muscle group extends across the posterior surface of the thigh from the ischium of the pelvis to the tibia of the lower leg.
Muscle vs bone: There are three muscles on the back of the femur (thigh bone) that run from your hip to your knee and are collectively called the hamstrings. The ischial tuberosity is the name of the bony area where the top of the hamstrings attach. ...Read more. Dr. Heidi Fowler Dr. Fowler.