Biomechanics Static Forces on handle of locked door

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SUMMARY

The discussion centers on a biomechanics problem involving static forces applied to a locked door handle by an 80kg individual. The ground reaction force is given as 810N, and the force applied to the door is calculated to be 200N. Participants emphasize the importance of drawing a free body diagram (FBD) to visualize the forces acting on the person, which aids in understanding the equilibrium condition where the sum of forces equals zero.

PREREQUISITES
  • Understanding of free body diagrams (FBD)
  • Knowledge of static equilibrium principles
  • Familiarity with Newton's laws of motion
  • Basic grasp of force vectors and their components
NEXT STEPS
  • Study the application of Newton's first law in static systems
  • Learn how to construct and analyze free body diagrams
  • Explore the concept of ground reaction forces in biomechanics
  • Investigate the relationship between mass, force, and acceleration in static scenarios
USEFUL FOR

This discussion is beneficial for physics students, biomechanics researchers, and anyone interested in understanding the principles of static forces and equilibrium in mechanical systems.

muddyjch
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Homework Statement


A person with a mass of 80kg pulls horizontally on the handle of a door which is locked. At that
instant, the ground reaction force has a magnitude of 810N. What is the force applied to the door?
(200 N)


Homework Equations





The Attempt at a Solution


It seems like there is something missing in this question and does the persons mass really matter? I am really confused on this one.
 
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muddyjch said:

Homework Statement


A person with a mass of 80kg pulls horizontally on the handle of a door which is locked. At that
instant, the ground reaction force has a magnitude of 810N. What is the force applied to the door?
(200 N)


Homework Equations





The Attempt at a Solution


It seems like there is something missing in this question and does the persons mass really matter? I am really confused on this one.

Welcome to the PF. Start by drawing a free body diagram (FBD) of the person, and list all of the forces that are acting on him/her. Be sure to include all horizontal and vertical forces. Then use the fact that the person is not moving, which implies that the sum of the forces is...?
 

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