How Much Force Do Elbow Ligaments Exert in Javelin Throwing?

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SUMMARY

The discussion focuses on calculating the force exerted by elbow ligaments during a javelin throw, where the forearm moves through an angle of ¼ radians in 0.20 seconds. The forearm length is 45 cm, and the combined mass of the forearm and javelin is 2.0 kg. Participants suggest using principles of centripetal acceleration to determine the force required by the ligaments, as the forearm acts as a lever in this motion. The key takeaway is that understanding angular displacement and time is crucial for solving this physics problem.

PREREQUISITES
  • Understanding of angular displacement and its application in physics
  • Knowledge of centripetal acceleration and its formula
  • Familiarity with lever mechanics and torque
  • Basic principles of dynamics and forces
NEXT STEPS
  • Calculate centripetal force using the formula F = m * a, where 'a' is centripetal acceleration
  • Explore the relationship between angular displacement and linear speed in rotational motion
  • Study the mechanics of levers and how they apply to human biomechanics
  • Review the principles of torque and its relevance in joint movements
USEFUL FOR

Students in physics, sports science professionals, biomechanics researchers, and anyone interested in the mechanics of athletic movements, particularly in javelin throwing.

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Homework Statement


When an athlete
throws a javelin her forearm snaps through an angle of
approximately ¼ radians in 0.20 s. The athlete’s hand moves
with approximately constant speed, the length of her forearm
is 45 cm, and the combined mass of her forearm and javelin
is 2.0 kg. Assuming that the system is well approximated by
a mass of 2.0 kg located 45 cm from the pivot, what force do
the ligaments holding the forearm to the elbow need to exert?

Homework Equations





The Attempt at a Solution



Im getting lost, I can't interpret the question easily. I really have no idea how to do this.
I can picture some sort of lever mechanism but other than that, I am confused as to what to do with the angular displacement value and the time period value theyve given us.

cheers
 
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Looks more like a centripetal force problem to me, unless I am reading it wrong. I am no biology expert, but I believe the ligaments are attaching the forearm with the elbow so it will experience a force due to the circular motion of the javelin. You will need to calculate this force based on what you know about centripetal acceleration.
 

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