How Does Bending Knees Reduce Impact Force in a Jump?

  • Thread starter CaptFormal
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In summary, when jumping down, it is important to bend your knees upon landing to avoid serious injury. In this scenario, a 72.6 kg man with a speed of 6.35 m/s comes to a halt in 2.19 ms during a stiff-legged landing. To calculate the average net force acting on him during this time, we can use the equation F=ma, with average acceleration being \Delta v / \Delta t.
  • #1
CaptFormal
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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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  • #2
what is the average acceleration?

F=ma
 
  • #3
I don't know. How would you go about solving for it?
 
  • #4
Average acceleration is [tex] \Delta v / \Delta t [/tex]
 

1. What is a stiff-legged landing?

A stiff-legged landing is a type of landing technique used in sports such as gymnastics and parkour, where the legs are kept straight and pointed during the landing instead of bending at the knees.

2. Is a stiff-legged landing safe?

While a stiff-legged landing can be visually impressive, it can also be dangerous if not executed properly. It puts a lot of stress on the joints and can lead to injuries such as ankle sprains or knee problems.

3. What are the benefits of a stiff-legged landing?

A stiff-legged landing can be beneficial for certain sports or activities where precision and control are important, such as in gymnastics or parkour. It also allows for a smoother and more controlled landing.

4. Are there any alternatives to a stiff-legged landing?

Yes, there are alternative landing techniques such as bending the knees to absorb the impact or rolling out of the landing. These techniques can reduce the risk of injury and are often used in activities such as martial arts or dance.

5. How can I improve my ability to perform a stiff-legged landing?

Practice and proper technique are key to improving your ability to perform a stiff-legged landing. It is important to have strong and flexible leg muscles, as well as good body control and awareness. Working with a trained coach or instructor can also help improve your technique and reduce the risk of injury.

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