How Does Bending Knees Reduce Impact Force in a Jump?

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Homework Help Overview

The discussion revolves around the physics of landing from a jump, specifically examining how bending the knees can reduce impact force. The scenario involves a 72.6 kg man who jumps and lands, with given parameters such as his speed before contact and the time taken to come to a halt.

Discussion Character

  • Exploratory, Mathematical reasoning

Approaches and Questions Raised

  • Participants discuss the calculation of average acceleration and net force during the landing phase. There is uncertainty about how to initiate the problem and the appropriate equations to use.

Discussion Status

Some participants have begun to identify relevant equations, such as F=ma and the formula for average acceleration. However, there is still a lack of clarity on how to apply these concepts to the problem at hand, indicating an ongoing exploration of the topic.

Contextual Notes

Participants express confusion about the initial steps needed to solve the problem, highlighting the challenge of applying theoretical concepts to practical scenarios. There is no consensus on the approach yet, and the discussion remains open-ended.

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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.
 
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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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