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.
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.
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.
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)
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?
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.
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
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.
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.
It was very helpful to see the two methods worked out to see the pros and cons and differences of each.
I definitely struggled with this question last week for our worksheet, and this totally clarified my questions!
Solving the problems really helped me
This video was very helpful in figuring out last weeks worksheet!
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.
See my reply to Lily above. I have trouble visualizing it right away too until I draw out the parallelogram
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.
Very helpful information for the worksheet!
Some of these examples would have been very helpful for last weeks worksheet, the reading in textbook was a bit complex
Thank you prof for, but I didn't understand what you mean by destabilization and stabilization force , there is another option to clarify more?
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.
Really liked this explanation, and theres a lot less math involved
Ah, very helpful seeing as I didn't have even have my book to help me at the time I attempted the worksheet.
Glad it was helpful!
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)
I am a bit confused when it comes to Figure 2. Is that point actually the elbow joint, or is it the tendon insertion?
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?
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.
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
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.
I'm still not sure how to know when to label the vectors x or y, it seems like they flip every time
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.
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