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.
Tight calf muscles is a common problem in athletes especially runners. The calf muscles are the Gastrocnemius muscle and the Soleus muscle. The big muscle at the back of the lower leg is called the Gastrocnemius. Itâs the muscle thatâs visible from the outside of the body.Under it, and further down the leg is a smaller muscle called the Soleus. The larger and most superficial of the two muscles, the Gastrocnemius, attaches to the heel with the Achilles Tendon and originates behind the knee on the femur, crossing two joints.ight calf muscles is a common problem in athletes especially runners. The calf muscles are the Gastrocnemius muscle and the Soleus muscle. The big muscle at the back of the lower leg is called the Gastrocnemius. Itâs the muscle thatâs visible from the outside of the body.