pstp eng High tech version of shoulder pole? The physics is similar to that discovered long ago in Asia, where some people carry light to moderately heavy loads by tying them to opposite ends of a spring pole such as a bamboo pole and placing the center of the pole over one shoulder , "1.196  Backpacks on bungee cords are easier to carry Jearl Walker www.flyingcircusofphysics.com February 2007   The main reason that a heavy backpack is difficult to carry is that as you walk, your torso rises and falls by several centimeters and thus you must repeatedly accelerate the backpack through that vertical distance. The force on your back is greatest when the torso begins to move upward and the backpack is accelerated upward. That demand automatically limits the speed at which you can walk, and running, such as running after a bus, is usually out of the question. More serious, the demand can severely limit an emergency crew member from moving rapidly with a heavy backpack of rescue equipment.        However, the difficulty of moving with a heavy backpack can be significantly reduced if the backpack is suspended by bungee cords from a pack frame. A person with such arrangement can even run. Although you might think a suspended backpack would be unwieldy, research conducted by Lawrence C. Rome, Louis Flynn, and Taeseung D. Yoo of the University of Pennsylvania showed that the vertical motion of the load is significantly decreased when the load is suspended than when it is rigidly attached to the back in the normal fashion. The reduction is primarily due to the out-of-step oscillations of the load with the torso. That is, when the torso moves upward, the load moves downward, and vice versa. There are two results: (1) The reduced vertical oscillation means that less force is required to accelerate the load. (2) When the load begins to move upward, the bungee cords accelerate the load instead of only the torso accelerating it. This physics is similar to that discovered long ago in Asia, where some people carry light to moderately heavy loads by tying them to opposite ends of a spring pole such as a bamboo pole and placing the center of the pole over one shoulder (check the URL listed below). As I discuss in the Flying Circus book, when such a person walks or runs, the two loads oscillate vertically and out of step with the vertical oscillation of the supporting shoulder. As a result, less force is required of the shoulder in the upward portion of the motion, because the springy pole helps propel the loads upward. URLs http://www.youtube.com/watch... Video of the suspended and non-suspended backpacks. http://www.iamtonyang.com/0609... Photo, bamboo pole use · Rome, L. C., L. Flynn, and T. D. Yoo, “Rubber bands reduce the cost of carrying loads,” Nature, 444, No. 7122, 1023-1024 (21/28 December 2006) · Harder, B., “A backpack with a suspension system,” Science News, 171, No. 2, 29 (13 January 2007)" , 2 -28 see also http://friendfeed.com/citizen... - Thomas Page

Interaction with shopping carts and vehicles? pictures http://www.iamtonyang.com/0609... , http://www.loupiote.com/photos... , http://sunsite.berkeley.edu/Finding... , https://www.google.com/images... , http://www.inc.com/ss... , - Thomas Page

New equation calculates cost of walking for first time http://www.physorg.com/news... , http://www.physorg.com/news185... , http://www.physorg.com/news156... , http://www.physorg.com/news929... , http://www.physorg.com/news652... , http://www.physorg.com/news959... , http://www.physorg.com/news357... , http://www.physorg.com/news185... , http://www.physorg.com/news171... , http://www.physorg.com/news168... , - Thomas Page

reverse electrowetting http://www.sciencedaily.com/release... , 8 -25 http://techcrunch.com/2011... , 9 -19 Kinetic power suit makes you work to hear your favorite music http://dvice.com/archive... - Thomas Page

http://en.wikipedia.org/wiki... http://en.wikipedia.org/wiki... Animal locomotion http://en.wikipedia.org/wiki... Free-runners explore orang-utans' ease in the trees University of Birmingham scientists are using parkour athletes - also known as free runners - to discover how orang-utans and other tree-dwelling primates maximise energy efficiency as they move through the forest canopy. http://www.physorg.com/news.... Acrobatic Gibbon http://www.youtube.com/watch... http://en.wikipedia.org/wiki... http://www.youtube.com/watch... http://www.youtube.com/watch... , http://www.labspaces.net/118698... , 7 -5 sort cheetah vs greyhound ? http://www.youtube.com/watch... http://www.psychologytoday.com/blog... http://www.redorbit.com/news... , 7 -21 sort http://www.npr.org/blogs... , 1 -6 http://evoanth.wordpress.com/2013... , 1 -8 http://inkfish.fieldofscience.com/2013... - Thomas Page

Biomechanics http://en.wikipedia.org/wiki... Kinesiology http://en.wikipedia.org/wiki... Sports_biomechanics http://en.wikipedia.org/wiki... Skeletal_system http://en.wikipedia.org/wiki... Joint http://en.wikipedia.org/wiki... Hip_joint http://en.wikipedia.org/wiki... http://en.wikipedia.org/wiki... http://en.wikipedia.org/wiki... http://en.wikipedia.org/wiki... http://en.wikipedia.org/wiki... Exercises-For-Healthy-Hips http://physicaltherapy.about.com/od... http://www.fitday.com/fitness... http://articles.elitefts.com/trainin... Ease-Hip-Pain http://www.wikihow.com/Ease-Hi... http://www.livestrong.com/article... http://www.physioadvisor.com.au/8109550... http://www.youtube.com/watch... http://www.aidmybursa.com/... http://www.webmd.com/pain-ma... ] , [ Body proportions http://en.wikipedia.org/wiki... http://en.wikipedia.org/wiki... http://www.goldennumber.net/human-b... http://medcaretips.com/health-... human factors kinesthetics http://en.wikipedia.org/wiki... http://en.wikipedia.org/wiki... http://www.trulyhuge.com/fitness... http://www.fitness.com/tools... http://www.impulseadventure.com/weights... http://www.catalystathletics.com/forum... http://forums.anandtech.com/showthr... http://wiki.answers.com/Q... http://www.runnersworld.com/beginne... http://www.runnersworld.com/running... http://www.salon.com/2013... , 1 -20 http://www.exrx.net/Exercis... , 1 -23 http://en.wikipedia.org/wiki... , 5 -5 http://en.wikipedia.org/wiki... http://en.wikipedia.org/wiki... http://en.wikipedia.org/wiki... 12 -8 Not Bursitis. Osteoarthritis ... http://friendfeed.com/citizen... http://friendfeed.com/citizen... http://friendfeed.com/citizen... http://friendfeed.com/citizen... http://friendfeed.com/citizen... - Thomas Page

Load-Carrying_Equipment http://en.wikipedia.org/wiki... http://www.vietnamgear.com/equipme... http://en.wikipedia.org/wiki... http://en.wikipedia.org/wiki... http://en.wikipedia.org/wiki... [ http://www.survivalblog.com/2012... http://www.blackhawk.com/product... http://store.glennsarmysurplus.com/tactica... http://en.wikipedia.org/wiki... http://en.wikipedia.org/wiki... http://en.wikipedia.org/wiki... http://en.wikipedia.org/wiki... http://en.wikipedia.org/wiki... - Thomas Page

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Sort relative body length acceleration rate of hovering insects and vs hummingbird ? vs house fly? - Thomas Page

Biomechanical Problem of Shot Putting Finally Solved http://www.technologyreview.com/view... http://www.ncbi.nlm.nih.gov/pubmed... http://www.physics.buffalo.edu/gonsalv... [ how to long jump like Bob Beamon ... http://trackandfield.about.com/od... http://m.wikihow.com/Long-Jump [[ standing http://www.humankinetics.com/excerpt... http://www.menshealth.com.sg/fitness... 8 -4 http://www.real-world-physics-... - Thomas Page

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3 -15 http://en.wikipedia.org/wiki... http://en.wikipedia.org/wiki... http://en.wikipedia.org/wiki... - Thomas Page

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Tortoise and Hare , Industrious Sloth and Hibernating Bear , Swimming Ape and Happy Beaver - Thomas Page

http://www.quotegarden.com/life... http://www.goodreads.com/author... chop wood carry water http://en.m.wikiquote.org/wiki... [ Bodhi Day http://en.wikipedia.org/wiki... - Thomas Page