Biomechanics Static Forces on handle of locked door

In summary, the problem involves a person with a mass of 80kg pulling on a locked door with a force of 810N acting on them. The question asks for the force applied to the door, which is 200N. To solve this, one can draw a free body diagram and use the fact that the person is not moving to determine the force applied to the door. The person's mass is not relevant to the solution.
  • #1
muddyjch
16
0

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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  • #2
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...?
 
  • #3


As a scientist, it is important to have all the necessary information before attempting to solve a problem. In this case, the missing information is the distance between the person's hand and the door handle. This distance is necessary to calculate the torque, or rotational force, applied to the door handle. Without this information, it is not possible to accurately determine the force applied to the door. Additionally, the person's mass may not be relevant in this scenario as it does not affect the force applied to the door handle. It is important to consider all relevant variables when solving a biomechanics problem.
 

FAQ: Biomechanics Static Forces on handle of locked door

What is Biomechanics?

Biomechanics is the study of the mechanical principles of living organisms, particularly humans, and how they interact with their environment.

What are static forces?

Static forces refer to the forces acting on an object when it is at rest or in a state of equilibrium. These forces do not cause the object to move, but rather maintain its position.

How do static forces affect the handle of a locked door?

Static forces can put stress on the handle of a locked door, depending on the weight and position of the person pulling on the handle. This stress can cause the handle to bend or break if it is not strong enough.

How does the biomechanics of a person affect the static forces on the handle of a locked door?

The biomechanics of a person, such as their height, weight, and muscle strength, can impact the amount of force they exert on the handle of a locked door. A larger, stronger person may exert more force on the handle compared to a smaller, weaker person.

How can biomechanics be used to design stronger handles for locked doors?

By understanding the biomechanics of a person and the forces they exert on a handle, engineers and designers can create stronger and more durable handles for locked doors. This can help prevent the handle from breaking or malfunctioning when subjected to static forces.

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