Biomechanics: How to Resolve Vectors in 2 Ways (No Math!)

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Күн бұрын

Learn what biomechanics is all about in this introductory video to Applied Biomechanics. This lecture is part of a free video series covering topics related to biomechanics: bit.ly/3iJzGHv
TIME-STAMPS
00:00 - Intro
01:17 - Vector Parallelograms
06:27 - Vector Chain
08:25 - Stabilization vs Destabilization
09:59 - Where to Head Next
RESOURCES MENTIONED
McLester, John, & St. Pierre, Peter. (2019). Applied Biomechanics: Concepts and Connections 2nd Edition. Jones & Bartlett Learning.
amzn.to/38EF0tc
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Fellow biomechanists, thanks for checking out this video-it’s part of a playlist that dives into the major topics covered in a university-level applied biomechanics course. I create these lectures for my kinesiology and sport science students but hope that they bring value to you as well. More here: bit.ly/2GLzZn4
Additionally, check out my Structural Kinesiology playlist, which will equip you with fundamental human anatomy and movement knowledge to level up your coaching craft: bit.ly/32kJ5zw
Or stop by my channel for complete teaching series statistics in kinesiology, strength and conditioning, and sport science: bit.ly/2Rlg5kQ
Have a great day and remember to move well, live well, and teach others to do the same!
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Dr. Jacob Goodin is a professor of kinesiology at Point Loma Nazarene University (PLNU), and holds a PhD in Sport Physiology and Performance from East Tennessee State University. He has over a decade of experience as a strength and conditioning coach and sport scientist from the high school to NCAA Division I levels. In addition to his role as a professor and research mentor, Dr. Goodin directs the Athlete Monitoring Initiative at PLNU, which provides testing and monitoring services to over 200 athletes yearly as well as research opportunities for kinesiology students.
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Пікірлер: 24

@peytonyoshida7500 2 жыл бұрын

It was very helpful to see the two methods worked out to see the pros and cons and differences of each.

@nicolelewis3329 2 жыл бұрын

I definitely struggled with this question last week for our worksheet, and this totally clarified my questions!

@sydneyspradley5289 4 жыл бұрын

This was super helpful for the worksheet! I kind of have the hang of it but it still gets confusing sometimes. I'm sure it will get easier the more I can I can visualize it and practice.

@amandahoward7775 2 жыл бұрын

so helpful for answering this week's worksheet! thank you :)

@tsalazar0020 2 жыл бұрын

This video was very helpful in figuring out last weeks worksheet!

@dimitricarrion105 2 жыл бұрын

Very helpful information for the worksheet!

@cassandraalviz1675 4 жыл бұрын

I agree with Noah. Creating the vectors now makes sense, but understanding them as different joints is still a little confusing when I try to picture it.

@DrJacobGoodin 4 жыл бұрын

See my reply to Lily above. I have trouble visualizing it right away too until I draw out the parallelogram

@tylerbarnhill78 2 жыл бұрын

Solving the problems really helped me

@oliviadyck510 4 жыл бұрын

I still really don't know what the heck a vector even is. It feels like a foreign language. However, I am going to keep watching this video and re-reading the chapter in our textbook until I can understand what it means

@DrJacobGoodin 4 жыл бұрын

Olivia a vector represents force. In order to have movement of a system (in biomechanics this is often a body or part of one) you need to have force. As a biomechanist if you want to understand movement you'll need to know the forces involved in the movement and how they interact with the system. We can represent these forces using vectors.

@Yasmin-qe4wf 4 жыл бұрын

Some of these examples would have been very helpful for last weeks worksheet, the reading in textbook was a bit complex

@mikestatz5098 4 жыл бұрын

Really liked this explanation, and theres a lot less math involved

@anthonydumas6641 4 жыл бұрын

Ah, very helpful seeing as I didn't have even have my book to help me at the time I attempted the worksheet.

@DrJacobGoodin 4 жыл бұрын

Glad it was helpful!

@SportifyTVofficial 3 жыл бұрын

What if on step 3 i would have drawn the paraller line for vertical component differently ? I could end up with x, y vector pointing different ways. Is that wrong? ( i hope i didn't confuse you)

@theperformanceengineer 2 жыл бұрын

I am a bit confused when it comes to Figure 2. Is that point actually the elbow joint, or is it the tendon insertion?

@jamaleddine8293 2 жыл бұрын

Thank you prof for, but I didn't understand what you mean by destabilization and stabilization force , there is another option to clarify more?

@DrJacobGoodin 2 жыл бұрын

a stabilization force pulls the joint into a tighter articulation, like it literally pulls the forearm into the upper arm, thereby stabilizing the elbow joint. A destabilizing force pulls the segments away from each other.

@zaina3589 4 жыл бұрын

Resolving vectors is way more simple after watching the video, especially compared to the book. I am still having trouble visualizing the difference between the brachioradialis and biceps brachii. I understand the point is the elbow joint, but would the x be the humeral part and the y be the forearm part? Are they the same or different for both muscles?

@DrJacobGoodin 4 жыл бұрын

Zaina if you check out those muscles on a diagram, you’ll see that the bicep brachii is more proximal (higher up) and the brachioradialis is more distal (mostly on the forearm), and yet both of these muscles cross the elbow joint and contribute to elbow flexion. As the elbow angle decreases, the line of pull for brachioradialis travels more or less with the forearm, while the bicep’s line of pull stays mostly parallel with the humerus. This is how the brachioradialis is able to maintain a constant stabilizing force throughout the movement while the biceps brachii does not.

@lilyhodgins9140 4 жыл бұрын

I'm still not sure how to know when to label the vectors x or y, it seems like they flip every time

@DrJacobGoodin 4 жыл бұрын

Lily it can be tricky as you point out. In these examples we were using the forearm (somatic frame of reference) as our horizontal x and therefore y would be orthogonal (90 deg) to it. If we were using a global reference frame then the coordinates do not change with movement of the system.