# UMass Amherst KIN 430 - Biomechanics Lab E (4 pages)

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# Biomechanics Lab E

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## Biomechanics Lab E

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Pages:
4
School:
University of Massachusetts Amherst
Course:
Kin 430 - Biomechanics
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Emily Weimer Laboratory E Ground Reaction Forces in Locomotion Introduction The goal of this lab was for students to familiarize themselves with the similarities and differences that exist between walking and running ground reaction forces In this lab a force plate was used to measure ground reaction forces at two different speeds within each gait By looking at two different speeds in each gait we are able to analyze the effects speed has within each form of gait As previously discussed in lab walking has a lower vertical displacement running which results from less strides taking place during the same amount of time When working with ground reaction forces knowledge of Newton s 3rd Law is essential Newton s 3rd Law states that every action has an equal and opposite reaction Newton s 3rd Law allows us to understand the equal and opposite reaction between the ground and the participant s body on the force plate which results from acceleration due to motion and gravity Methods In this lab groups of students were instructed to work together at a single workstation nominating one student to volunteer for all trials of walking and running speeds To ensure data is obtained correctly we set the frequency to 100 Hz which records 100 samples per second The participant will be asked to step on the force platform once during each phase of speed slow walk faster walk slow run and faster run As the participant steps on the force platform it will determine the forces associated with the foot s contact time during stance phase The data should then be exported into an excel document to be interpreted Results Vertical GRF Slow Walking 800 Force N 600 400 200 0 2 65 2 85 3 05 3 25 3 45 3 65 3 85 Time s Vertical GRF Faster Walking 1000 Force N 800 600 400 200 0 2 8 2 9 3 3 1 3 2 3 3 3 4 3 5 3 6 2 45 2 5 Time s Vertical GRF Slow Running 1600 Force N 1200 800 400 0 2 05 2 1 2 15 2 2 2 25 2 3 Time s 2 35 2 4 Vertical GRF Faster Running 1600 Force N 1200 800 400 0 4 7 4 75 4 8 4 85 4 9 4

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