How Does Bending Knees Reduce Impact Force in a Jump?

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SUMMARY

Bending knees during a jump significantly reduces the impact force experienced upon landing. In the case of a 72.6 kg man landing stiff-legged at a speed of 6.35 m/s, he comes to a halt in 2.19 ms, resulting in a calculated average net force. The average acceleration can be determined using the formula Δv / Δt, where Δv is the change in velocity and Δt is the time taken to stop. Understanding these calculations is crucial for injury prevention in jumping scenarios.

PREREQUISITES
  • Newton's Second Law of Motion (F=ma)
  • Basic kinematics, including velocity and acceleration
  • Understanding of force and mass relationships
  • Concept of impulse and momentum
NEXT STEPS
  • Calculate average acceleration using Δv / Δt for various landing scenarios
  • Explore the physics of impulse and its effect on landing forces
  • Research biomechanics of jumping and landing techniques
  • Study injury prevention strategies in sports involving jumps
USEFUL FOR

Students studying physics, sports coaches, physical therapists, and anyone interested in biomechanics and injury prevention strategies related to jumping.

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Homework Statement


When jumping straight down, you can be seriously injured if you land stiff-legged. One way to avoid injury is to bend your knees upon landing to reduce the force of the impact. A 72.6 kg man just before contact with the ground has a speed of 6.35 m/s. In a stiff-legged landing he comes to a halt in 2.19 ms. Calculate the average net force that acts on him during this time.


Homework Equations





The Attempt at a Solution


I don't even know how to start this one. Please help.
 
Physics news on Phys.org
what is the average acceleration?

F=ma
 
I don't know. How would you go about solving for it?
 
Average acceleration is \Delta v / \Delta t
 

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