• Register
PhysicsOverflow is a next-generation academic platform for physicists and astronomers, including a community peer review system and a postgraduate-level discussion forum analogous to MathOverflow.

Welcome to PhysicsOverflow! PhysicsOverflow is an open platform for community peer review and graduate-level Physics discussion.

Please help promote PhysicsOverflow ads elsewhere if you like it.


PO is now at the Physics Department of Bielefeld University!

New printer friendly PO pages!

Migration to Bielefeld University was successful!

Please vote for this year's PhysicsOverflow ads!

Please do help out in categorising submissions. Submit a paper to PhysicsOverflow!

... see more

Tools for paper authors

Submit paper
Claim Paper Authorship

Tools for SE users

Search User
Reclaim SE Account
Request Account Merger
Nativise imported posts
Claim post (deleted users)
Import SE post

Users whose questions have been imported from Physics Stack Exchange, Theoretical Physics Stack Exchange, or any other Stack Exchange site are kindly requested to reclaim their account and not to register as a new user.

Public \(\beta\) tools

Report a bug with a feature
Request a new functionality
404 page design
Send feedback


(propose a free ad)

Site Statistics

205 submissions , 163 unreviewed
5,075 questions , 2,226 unanswered
5,348 answers , 22,744 comments
1,470 users with positive rep
818 active unimported users
More ...

  Physics of Jumping spider

+ 1 like - 0 dislike

I recently viewed this video:

httpss://www.youtube.com/watch?v=FhpL5h8sEHo  (without the s after https)

i really dont understand how the high blood pressure acts on the legs. The physics i understand is that - A body to do some action needs to put opposite force on the stationary body for relative motion, yearning a reaction force on the body itself thus providing motion. But you can see that the spiders legs are frail, weak, then a sudden high release of blood would destroy the legs. And even for that high blood preassure, the legs must have enough strength to bear the high pressure, which it doesnt look like it can. 

I know impulse provides large forces in short time to provide more energy, but does it concern an area of action? I suppose the impulse acts on a point of their legs to generate more pressure to lift, but it doesnt even look like its been concentrated at a point while it propels. It seems like the power to jump is coming from somewhere else.

Can someone please explain me the science behind its jumping? It would be really grateful for the community and me, as this jumping nature keeps bugging me.

asked Jun 20, 2017 in Applied Physics by Manoj [ revision history ]
edited Jun 21, 2017 by Arnold Neumaier

Nice video. Should 'relativistic action' read 'relative motion'? (''relativistic'' suggests motion close to the speed of light, which it isn't...)

Yes, my bad, its relative motion.@ArnoldNeumaier But this wont work in scaled up model right? like in bigger bots?

I corrected the language. 

Whatever the detailed mechanism, these things never scale. Small objects move far more easily than large ones. A flea jumps far wider than 4 times its length (as the spider in the video does).

Your answer

Please use answers only to (at least partly) answer questions. To comment, discuss, or ask for clarification, leave a comment instead.
To mask links under text, please type your text, highlight it, and click the "link" button. You can then enter your link URL.
Please consult the FAQ for as to how to format your post.
This is the answer box; if you want to write a comment instead, please use the 'add comment' button.
Live preview (may slow down editor)   Preview
Your name to display (optional):
Privacy: Your email address will only be used for sending these notifications.
Anti-spam verification:
If you are a human please identify the position of the character covered by the symbol $\varnothing$ in the following word:
Then drag the red bullet below over the corresponding character of our banner. When you drop it there, the bullet changes to green (on slow internet connections after a few seconds).
Please complete the anti-spam verification

user contributions licensed under cc by-sa 3.0 with attribution required

Your rights