Biomechanics Definition and 69 Threads

TL;DR Summary: Solved the biceps, but having trouble finding the reaction force now. I eventually calculated, using the moment, that the force exerted by the biceps is 1536 N (this is correct according to the model solution), but the calculation of the reaction force is more difficult. I was...

This may seem like an obvious and foolish question intuitively, but I am curious about something. Let's assume we are performing a biceps curl exercise. To properly analyze human movement, a much more complex process is needed, but I will simplify it as much as possible. As the name of the...

Is the physics down below sound? I always thought the highest momentum is the most powerful. "Biomechanically, humans are REALLY good at throwing things and quite good at swinging as well. When it comes to thrusting we are good, but not as much.But the larger portion probably comes down to pure...

𝐹𝑃𝑥 = 93.6650N sin (85 − 90) + 28.11N sin(180 − 85 − 79) Fpx= -8.16344N +7.74816N 𝐹𝑃𝑥 = -0.4154 N←

I graduated Bioengineering BSc and I am currently a MSc student in the field of Biomaterials and Biomechanics. Next year I will finish this master and I am interested in searching for job. I do not know what kind of job can I apply for with my master degree. I would like to search and prepare me...

I was having trouble with a physics problem (string tension dynamics) In this case I have a model that simulates the phalanges of a human finger. Each phalanx is a block of mass m1, m2 or m3 respectively. And to simplify it, consider the 3 equal masses. These phalanges are linked by joints that...

I was wondering if someone can explain how failure criteria work when dealing with viscoelastic materials. I'm quite new to this, so I only know how they work with brittle and ductile materials. (not in too much detail either). And now that I'm at it anyway, if possible an explanation on...

The board is 4m and has 2 supports: support 1 exerts 5400N and support 2 exerts 6000N before the diver performs the dive. Neglecting the mass of the board, what is the force on the board due to the weight of the diver? My attempt at this question: FS2 - FS1 = 6000 - 5400 = 600N But I'm having...

Hello! I am a third year kinesiology student who is struggling with her biomechanics assignment. Mind you, I haven’t studied physics or trigonometry in four years since i left high school so I really need some help.

Hi Everyone! I am a physio and I'm currently working with some alpine ski athletes. I don't have a lot of experience with this sport, so I tried to understand some basics about the physics and biomechanics of the sport. (The athlete is in my practice for a knee injury). Looking at the picture...

Homework Statement So there is given that the muscles of the neck support the head and thus exert an M force. The head is 3kg = 30N. Homework Equations We got to calculate the M and F forces. The M force has to be 25 and F 45 . I know this because we got the answers. The Attempt at a...

Hello everyone, I know that the any object, human body included, when the vertical line from its center of mass to the floor falls outside the base of support, topples under the influence of gravity: the force of gravity produces a nonzero torque that rotates the body. Is the human body able to...

I know this isn't "EngineeringForums" but I'm curious if anyone has any experience with taking a physics undergrad degree and then studying engineering for their masters. I have a couple engineering friends and the math is basically the same so far, though is there anything I should know? Study...

Homework Statement Jenna is standing still when her dancing partner, Tyrel, begins to lift her up and throw her into the air. Jenna's mass is 40 kg. Tyrel exerts an average vertical force of 500 N for 0.8 s on Jenna during the lift and throwing motion. What is Jenna's vertical velocity when...

Can someone explain the terms viscoelasticity, creep and strain and their relationship to each other? Especially the difference between creep and strain. Any help would be greatly appreciated, thank you!

Homework Statement A man deals his bicycle up a 5 percent road at constant speed. Man+bicycle mass=90 kg with mass centre G. 1)Access direction of frictional forces 2) explain why frinctional force in front wheel can be neglected having a const. speed taking front wheel as FBD 3) Find normal...

Namasté, I'm an avid tennis player trying to deepen my understanding of tennis and its equipment. I hope to learn more about this subject. Thank you. :) Cheers, Yesudeep.

Homework Statement F a man and a woman walk on a surface horizontally and create an 80° angle and 1000N ground reaction force on their leg. If the friction coefficient of the carpet is μ=0.55, and friction coefficient of a tiled floor, μ=0.18 will they slip? Show working to your answer. Can...

Hi, I have problem of finding the deformation of skin using a probe. I have identified the different layers of skin and made the model accordingly along with a probe in contact with the top layer of skin. The model is basically 15x15mm model with extrudes of different thickness for each layer...

Homework Statement Imagine that you are standing on the edge of a cliff looking out over the vista… a sudden gust of wind nudges you off balance and you start tilting out over the edge of the cliff…. Yikes! You start wind milling your arms to regain your balance. A) do you rotate your arms...

Homework Statement A speed skater increases his speed from 10 m/s to 12.5 m/s over a period of 3 seconds while coming out of a curve of 20 m radius. a. What is the magnitude of his angular velocity as he leaves the curve? Be sure to include proper units for your answer. b. What is his average...

Hello All! I was wondering about how to find the range of motion of specific joints with the only given "hints" being degrees and time (in seconds) of the ankle, hip, and knee joints. Also a scatter plot. I am aware that I have to use the degrees of each joint (perhaps finding , however I do not...

Damn title character limits. I just had the weirdest thought while rearranging my computer's case fans. I put my hand in front of one of them and felt a light breeze of air, telling me it was working. This is due to the local cooling produced where the fan's airstream comes in contact with the...

Hi. I'm trying to solve this problem but I'm not sure my solution is right: "Suppose that a male gymnast wishes to execute an iron cross during a gymnastics session. The total mass of the gymnast is 60 kg. Each ring supports half of the gymnast's weight. Assume that the weight of one of his...

Hi, Having a background of horticulture training (NZTCH) and tree specialisation (NSW Arbor Techniques & Tree Surgery), I'm very interested in biomechanics so enjoy books written by authors like Prof. Dr. Claus Mattheck http://www.mattheck.de/english/english2.htm My question is: Given a height...

Homework Statement http://tinypic.com/r/sebqc1/8 Homework Equations can anyone help me with this question? I know i have to use torques to find the answer but i have no idea how to solve it and write equations for it. thanks The Attempt at a Solution

Shoulder abduction = 15° Abduction acceleration = 50/rad/s/s Abduction velocity = 20 rad/s Radius of gyration and COM location from joint = 25cm Mass of hand + Arm = 8 kg Force of middle deltoid =400N Middle deltoid only active muscle Force of theraband = 70N Middle deltoid insertion = 15° Φ=90...

Hi, everyone. I am new here. I am an ocean engineering student. Rerently, I have received an invitation into a biomechanics group which is focus on biomechanics in musculoskeletal system, in particular fluid and solute transport in bone and cartilage. I do not know this area much. What kind of...

What is your reason for studying physics and what do you want to do with it. I actually got thrown into my schools physics program by accident. I began at a community college studying nanotechnology and when i transferred schools it was supposed to be a two-plus two program meaning I would get...

Hi all, Wasn't sure whether this fits best in the maths or engineering forums, either way I'm hoping that a mathematical solution exists for my problem which I'll now explain. My problem is one of biomechanics. One of the primary exercises I use is the barbell squat. Holding a loaded bar on...

Homework Statement I am trying to understand a diagram I have of a gymnast hanging from a bar. She weighs 50kg and is not swinging, just hanging. In the diagram it has her weight as 500N (using 10/m/s/s for gravity * 50kg) but the bar she is hanging from has an upward arrow with 550 N next to...

Hey all! I just found out and joined the forum. I am a Biomedical Engineering student and in desperate need of help. We were given couple of questions to hand in next week. I managed to solve most of them, but I'm kinda lost at these 3 questions. For question 2.1, I managed to calculate the...

Homework Statement Stacy is throwing a discus. During the throw, she applies an average torque of 90Nm to the discus for 0.3 seconds. The discus has a mass of 1.0kg, and has a radius of gyration of 0.1m about its spin axis. If the initial angular velocity of the discus was zero, what was the...

Hi, i didnt know where to put this question cos its kind of multitopic, here is why... I am working on a better way to take mechanical energy from muscles, i made a teste bench for pedalling in very different ways, including traditional(circular) pedalling, the thing is. I am measuring the power...

Please let me know if I did this wrong or right, and if I did it wrong, please correct me :) 1. Homework Statement The biceps brachii, a muscle in the arm, connects the radius, a bone in the forearm, to the scapula in the shoulder (see below). The muscle attaches at two places on the scapula...

Homework Statement A male and female pair of dancers start dancing when the male lifts the female and throws her into the air. The female's mass is 40kg . The male exerts an average vertical force of 500n for 1.0s on the female. What is her vertical velocity when she is released into the air...

Could somebody help, or refresh my memory. I am trying to give six examples as to how to express 500N in six examples of human performance kinetic factors. They could be torque, pressure, power, inertia, momentum, or impulse? Any help would be appreciated... Homework Equations...

I'm in my third and final year Bs. in mechanical engineering degree .(I need to do a 2 year Ms. to have a BE. equivilant in case anyone was wondering) .Anyways , I don't know where to start with my senior project. I'm interested in the bio mechanics field . I love animals (my dog is my best...

Homework Statement I was assigned a worksheet for a biomechanics class that had a simple impulse-momentum problem. My instructor and I disagree about the means to solve the problem. "A pitched ball with a mass of 150g (.15kg) reaches a catcher's glove traveling at a velocity of 28m/s...

My questions is about the bar (not specifically) in this video: I want to know from somebody who has a better mechanical perception than me why the bar has the effect of wobbling back and forth. I think it's because the center of the mass of the system (not including the person) is low...

Homework Statement 1. Neglecting the height of release, a ball is thrown vertically upwards at 20 m/s, find: d) time (s) that the projectile is at height 10.5 m. V1 = 20m/s a = -9.81m/s^2 d = 10.5m Homework Equations d = v1*t + 1/2 a(t^2) The Attempt at a Solution...

Two basketball players jump for the ball. Both players have exactly the same mass and exactly the same body segment dimensions. Both players also take-off with exactly the same vertical and horizontal velocity of their center of gravity (CoG). Player A jumps up and reaches for the ball with both...

1. My professor explained this concept before, but I didn't quite understand. I need help with understanding how if two players jump for the ball with the exact same mass and body segment dimensions, taking off with the same vertical and horizontal velocity of the CoG, one can have an advantage...

Any ideas of what's the best type of knee joints structure implant to help patients with osteoarthritis and other disease?

I'm writing a paper about the physics of free throw shooting for my physics class. My teacher suggested including the biomechanics of it would be a good idea. To be honest I don't know anything about biomechanics. I've been searching on the internet about this topic but I couldn't find...

Homework Statement A leg has a horizontal propulsive ground reaction force 200N and vertical ground reaction foce of 1200N applied to it. Draw a free body diagram. The leg has an acceleration of -4m/s2 in the x direction and 8m/s2 in the y direction. What are the horizontal + vertical...

Homework Statement An athlete performs a dive from a handstand off a 10m tower. her center of mass is 0.8m above the tower as she falls into the dive a) if she can rotate at 5.7rad/s in a tucked position, how many complete somersaults can she do in her dive? assume she must stop rotating 1m...

An athlete performs a dive from a handstand off a 10m tower. her center of mass is 0.8m above the tower as she falls into the dive a) if she can rotate at 5.7rad/s in a tucked position, how many complete somersaults can she do in her dive? assume she must stop rotating 1m above the water to...

Homework Statement A long jump trial, the vertical ground reaction force of an athlete’s take-off leg was measured as shown below. At foot strike, the horizontal velocity of the take -off leg was 8.00 m/s and the vertical velocity of the take-off leg was -2.30 m/s. (Chart as Attachment)...

Bodybuilder “Hulk” Heise is doing leg curls on a Cybex machine. “Hulk” gets stuck (see figure) with 90° angle at the knee joint. The force exerted by the machines (FA) on his leg is 500 N, directed at an angle of 55° (angle α) relative to the tibia, and the distance from “Hulk’s” knee joint to...