What Are the Scientific Names for These Physical Movements?

  • Thread starter Thread starter aoede
  • Start date Start date
AI Thread Summary
The discussion revolves around three questions related to biomechanics and mechanical design. The first question addresses the strain on flexor muscles when fingers are abducted, seeking the term for this secondary force. The second question inquires about the flat position of an arm on a table, comparing it to a crane's inability to swing in that position. The third question focuses on the tapered design of a fishing rod, which allows for efficient casting by having a thicker base and thinner tip. Overall, the conversation emphasizes the relationship between physical positioning and mechanical efficiency.
aoede
I have three questions. I don't know if any of these questions have "physics" answers:

1) With all five fingers together, wave bye bye. Now abduct them (spread them out) and wave bye bye. The addition of the abductor muscles creates a strain on the flexors. What is that secondary disrupting force called?

2) If you lie your arm flat on a table and poke the table, you could strain your tendons but if you poke the table from above, you won't strain. What is the flat position called? Like, a crane lying on the ground can't swing a wrecking ball but, in the upright position it can.

3) A fishing pole is thick at the base and thin at the tip so that the flexibility can cast the lure most efficiently. What is that construction called . . . where the base is stronger? The base moves the least so the tip moves the most causing the lure to go the furthest. For instance, swatting a fly, the shoulder moves a little but the hand travels two or three feet.
 
Physics news on Phys.org
(1) Just describes separate actions .

(2) Mechanical advantage .

(3) Optimal design of a device used for a specific purpose .
 
Every day we learn new things. Sometimes it's just a small fact or realization. No matter how trivial or random, let's start recording our daily lessons. Please start off with "Today I learned". Keep commentary to a minimum and just LIKE posts. I'll start! Today I learned that you clean up a white hat by spraying some cleaner with bleach on it (rinse before putting it back on your head!)

Similar threads

Replies
1
Views
10K
Replies
4
Views
3K
Replies
1
Views
3K
Replies
1
Views
3K
Replies
1
Views
2K
Replies
4
Views
10K
Replies
7
Views
3K
Replies
9
Views
3K
Back
Top