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  3. a person performs a squat deep knee bend exercise as...

Question: a person performs a squat deep knee bend exercise as...

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A person performs a squat (deep knee bend) exercise, as shown below on the left, in order to strengthen their quadriceps muscles. The exercise begins with the person standing straight up, with knees fully extended (α 0°), and progresses as the person flexes their knee and hip joints. The figure below on the right describes the flexion of the knee joint as the exercise progresses, with the flexion angle increasing past 100 (a>100°) by the completion of the squat. If done correctly (and safely!), this exercise is performed slowly and without significant acceleration or deceleration. For this reason, we can use static mechanical models to describe the exercise. α-70-100. α>100. The figure below depicts the forces exerted on the patella (knee cap) by the quadriceps tendon and patellar tendon during this exercise. The angles between the quadriceps and patellar tendons and the horizontal are represented by B andy, respectively. 1 Quadriceps Tendon Patella Femur Patellar Tendon Tibia 2 (a) Considering the patella as a free body, draw the additional force vector that brings the patella into equilibrium. Describe the anatomical nature of this force.
For the range 20° < α < 1200, the following model cquations may be used: (2) y 100- 3 (3) Ti 0.1871a2 0.8602a 4) T2 0.7T (b) Complete the table using model equations (1) (4) and equilibrium analysis of the patella. Fill in the final column with the force that you added to the diagram on page 1. Quadriceps ForcePatellar Tendon Knee Angle (a) 20° 450 70° 95° 120° (TI) Force (T:) (c) For-120, draw the free body diagram of the patella in equilibrium. Label all force and angle values Tendon -flexible but inelastic cord of strong fibrous collagen tissue attaching a muscle to a bone Quadriceps-a group of muscles located in the front of the thigh Patellar tendon- a strong tendon that attaches the knee cap (patella) to the shin bone (tibia) Flexion -a bending movement that decreases the angle between body parts Extension-a straightening movement that increases the angle between body parts
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