1answer.
Ask question
Login Signup
Ask question
All categories
  • English
  • Mathematics
  • Social Studies
  • Business
  • History
  • Health
  • Geography
  • Biology
  • Physics
  • Chemistry
  • Computers and Technology
  • Arts
  • World Languages
  • Spanish
  • French
  • German
  • Advanced Placement (AP)
  • SAT
  • Medicine
  • Law
  • Engineering
Snezhnost [94]
2 years ago
14

The lubrication of bone joints is a subject of ongoing medical research. Two bones connected at a joint do not touch. The bones

are covered in articular cartilage, and are surrounded by lubricating synovial fluid. Rheumatoid arthritis results in overproduction of synovial fluid, swollen joints, and difficult and painful movement. Other joint disorders degrade the synovial fluid, directly increasing the friction between the bones, resulting in painful motion.
Part A



To measure the effective coefficient of friction in a bone joint, a healthy joint (and its immediate surroundings) can be removed from a fresh cadaver. The joint is inverted, and a weight is used to apply a downward force
Physics
1 answer:
maks197457 [2]2 years ago
5 0

The question is incomplete. The complete question is :

To measure the effective coefficient of friction in a bone joint, a healthy joint (and its immediate surroundings) can be removed from a fresh cadaver. The joint is inverted, and a weight is used to apply a downward force F⃗ d on the head of the femur into the hip socket. Then, a horizontal force F⃗ h is applied and increased in magnitude until the femur head rotates clockwise in the socket. The joint is mounted in such a way that F⃗ h will cause clockwise rotation, not straight-line motion to the right. The friction force will point in a direction to oppose this rotation.

Draw vectors indicating the normal force n⃗  (magnitude and direction) and the frictional force f⃗ f (direction only) acting on the femur head at point A.

Assume that the weight of the femur is negligible compared to the applied downward force.

Draw the vectors starting at the black dot. The location, orientation and relative length of the vectors will be graded

Solution :

The normal force represented by N is equal to the downward force, $F_d$ which is equal in magnitude but it is opposite in direction.

Also the frictional force acts always to oppose the motion because the bone starts moving in a clockwise direction. The frictional force that will be applied to the right direction so that the movement or the rotation at A is opposed.  

You might be interested in
How much force must be applied on a blade of length 4cm and thickness of 0.1mm to exert a pressure of 4000000pa?
Viktor [21]

Answer:

F= 403429 kpa

Explanation:

Pressure is the product of force and area

Mathematically,

P=F*A -------where F is force and A is area.

A= 40 *0.1 = 4mm² -----convert to m²

A= 4e⁻⁶ m²

P= 4000000 pa

F= P/A = 4000000/4e⁻⁶

F= 403428793.493 pa

F= 403429 kpa

7 0
3 years ago
The direction of the magnetic field is parallel to the field line at any point in space. A small compass will point in a directi
Slav-nsk [51]
I think the answer is false
6 0
3 years ago
a person throws a ball in such a way that its speed is zero at one particular point in its path. How did the person throw the ba
Keith_Richards [23]

vertical! or in other words, up!


6 0
3 years ago
Tyler's favourite number is 8642, and he tries to fit it into everything he does. If he wishes to do that much work by climbing
Brums [2.3K]

Answer:

2014

Explanation:

none

6 0
3 years ago
A piece of rope is pulled by two people in a tug-of-war. each exerts a 400-n force. what is the tension in the rope?
Leokris [45]
Newtons 3.law: Action = Reaction

If a body exerts a force on a rope of 400 N the rope exerts a force on the body of 400N also. So the tension in the rope is 400N. See pictures below.

3 0
3 years ago
Read 2 more answers
Other questions:
  • A car traveling at a constant speed travels 1000 feet in 12 seconds . In miles , how far will this car travel in 4 hours
    5·1 answer
  • What's 5 and 6? Physics
    12·1 answer
  • How old is the planet? ____________________ how old is the earliest evidence of life on earth? ____________________?
    7·1 answer
  • The biosphere and its ecosystems are made up of ________ components.
    9·1 answer
  • 1. Using the data from M7:<br>Which four countries are the worst in releasing CO2?​
    15·1 answer
  • Q- A body is acted upon by two forces 30N due east and 40N due North. Calculate
    12·1 answer
  • How should variables be depicted on a graph?
    15·1 answer
  • A 0.420 kg block of wood rests on a horizontal frictionless surface and is attached to a spring (also horizontal) with a 20.5 N/
    11·1 answer
  • The answer plz quickkkk
    10·1 answer
  • 1) What is the difference between acceleration and velocity? Write a paragraph that would make sense to a 5th grader.
    12·2 answers
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!