Question

The Achilles tendon is located on the back of the ankle as far as possible from the ankle joint (6 cm) to give the calf muscles (gastrocnemius and soleus) the maximum advantage lifting the body. Assume a 98 kg basketball player (weight of 961 N) with a foot length of 30 cm is jumping from the right foot with only the ball of the foot in contact with the floor. a) Assuming static equilibrium, how much muscle force (G) in N is supp ted by the Achilles tendon the instant the heel leaves the floor? b) What kind of iever system is this, and does the gastrocnemius/soleus muscle have a mechanical advantage or disadvantage in a) above? Explain. 3. Figure 3 - Calf-raise Biomechanical Model Solve Problem 11 in Chapter 2 of the Bridger text. Note that you will need to modify the spinal compression model we've used in the course for the COG acting directly above the spine (d-0), which is the case for a very thin individual. You may assume the erector spinae muscles act vertically. Also, you'll note that values of mass must be converted to forces, where F m (9.81 m/s2) in Newtons. Then, estimate the back compressive force if the upper body has a mass of 45 kg. 4. 5. Solve Problem 14 in Chapter 2 of the Bridger text. FUIITSU

Answer 1

CLASSTIME Page No. Date 8 8 Load arm em ル1 , stalic 1ou Loa 961N 320.33 N