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Deep Knee Bends

CSEF · 2017 Applied Mechanics & Structures

Maggie E. O'Rourke · Holy Cross School, Santa Cruz, Santa Cruz County

Overview

Objectives/Goals The objective is to find how much stress is put onto the knee using a mechanical model. Methods/Materials Made a wood and spring model of the knee to test how much stress is put onto the knee depending on the angle. Used wood, power drill and bits, screws, hinges, two springs (different sizes: 1 1/2 inch and 2 1/2), protractor, metric ruler, journal. Results When the mechanical knee was bent at the maximum point (which was 20 degrees), it put the most stress on the knee and the force doubled. Conclusions/Discussion Built a mechanical model of a knee to measure how much stress was put onto the knee depending on the angle. It is concluded when the knee is bent completely, (20 degrees) the most stress was put onto the knee as the spring expanded the most. The force doubled from a normal standing position (105 degrees) to when bent completely (20 degrees).

Summary statement

I built a mechanical model of a knee to see how much stress is put onto the knee depending on the angle.

Help received

My dad and I built the mechanical model, Ms. Katherine Moreno, my science teacher, helped me to understand Hooke's law, and Chris Donohoe helped me with my measurements and graphing.

Competition history

  • CSEF 2017 Applied Mechanics & Structures · Entry J0321

Resources

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