Suited for Spacewalking pdf - Virtual Astronaut

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humidity when oxygen is flowing from both theprimary and secondary oxygen systems. Near thefront on the top is an alpha-numeric display. Amicroprocessor inside the PLSS permits astronautsto monitor the condition of the various suit circuitsby reading the data on the display.Stepped down from the top of the DCM, on asmall platform to the astronaut’s right, is a ventilation-fanswitch and a push-to-talk switch. Thea s t ronaut has the option of having the radiochannel open at all times or only when needed.On a second platform, to the left, is an illuminatedmechanical-suit pressure gauge. At the bottom,on the front of the DCM, are additional controlsfor communications volume, display lightingintensity, temperature control, and a four positionselector for controlling suit pressure in differentEVA operating modes.3 0 • Suited for Spacewalking An Activity Guide for Technology Education, Mathematics, and Science, EG- 1 9 9 8 - 0 3 - 1 1 2 - H Q
Working In SpaceOne of the great advantages of working inspace is that objects,including the astronauts themselves,have no apparent weight. Regardless of theweight of an object on Earth, a single crew membercan move and position that object in orbit with easeprovided the crew member has a stable platformfrom which to work.The physics of working in space is the same asthat of working on Earth. All people and thingsc ontain matter and con s e q u e n t ly have mass.Because of that mass, they resist any change inmotion. Physicists refer to that resistance as inertia.The greater the mass, the greater the inertia.Like on Eart h , to change the motion ofobjects in space re q u i res an applica t i on of forc e .H ow mu ch the object moves is explained in partby Sir Isaac Newt on's T h i rd Law of Motion . T h elaw states that a force causing an object to moveone way is met with an equal and opposite force inthe other dire c t i on . The law is more familiarlystated as, “For eve ry action there is an opposite andequal re a c t i on . ” The consequence of this law inspace is import a n t . A simple Earth task, s u ch ast u rning a nut with a wre n ch , can become quite difficultin space because the astronaut—and not then u t — m ay turn .Ap p l i ca t i on of force on Earth is easy beca u s ewe plant our feet firm ly on the gro u n d . We ca nl i ft heavy objects upw a rd because the equal andopposite force is directed dow nw a rd through ourlegs and feet to Earth itself. E a rth's inertia is sog reat that its re s p onse to the dow nw a rd force isi n f i n i t e s i m a l . In space, on the other hand, a s t ronautsdo not have the advantage of having a planetto stand on to absorb the equal and oppositef o rce during work activities. As explained in theT h i rd Law of Motion , pushing on an object ca u s-es the object and the crew member to float awayin opposite dire c t i on s . The rates at which thec rew member and the object float away from eachother is determined by their re s p e c t i ve masses.For example, a massive satellite will move awaymu ch more slow ly than the less massive astron a u tpushing on it. To gain advantage over objects, t h espacesuited crew member must be bra c e d ,t h rough foot re s t ra i n t s , by a stable platform , s u chas a massive and active ly stabilized Shuttle orb i t e ror Intern a t i onal Space St a t i on .EVAAs Apollo spacesuits were being developed forwalking on the surface of the Moon,a special set oftools was designed to assist astronauts in their samplecollecting task. The Apollo suits were stiff, andbending at the waist was difficult and awkward.Suited for Spacewalking An Activity Guide for Technology Education, Mathematics, and Science, EG-1998-03-112-HQ • 3 1
Page 1: National Aeronauticsand Space Admin
Page 6 and 7: National Education StandardsThe act
Page 8 and 9: National Mathematics StandardsNatio
Page 10 and 11: M e a s u r e m e n tThis activity
Page 12 and 13: need to be able to move arms, hands
Page 14 and 15: out in the vacuum of space.Dissolve
Page 16 and 17: Project MercuryEarly spacesuit desi
Page 18 and 19: to occur for the first time. As wit
Page 20 and 21: crew, an additional portable heat s
Page 22 and 23: and reentry, special orange-colored
Page 24 and 25: The SCU contains lines for power, c
Page 26 and 27: 17.Communications Carrier Assembly
Page 28 and 29: settings to be read. Setting number
Page 30 and 31: digital display on the chest-mounte
Page 32 and 33: Astronaut Joe Tanner works on the H
Page 36 and 37: The problem of picking up rocks and
Page 38 and 39: Bruce McCandless II pilots the MMU
Page 40 and 41: Mark C.Lee test flies the Simplifie
Page 42 and 43: STS-76 astronaut Michael R. Cliffor
Page 44 and 45: Spacesuit technicians test the mobi
Page 46 and 47: Future spacewalkers will roam the s
Page 48 and 49: Introduction:The steps spacesuit en
Page 50 and 51: Design BriefC o n t ex t :Spacesuit
Page 52 and 53: Interface Control DocumentPage 1 Of
Page 54 and 55: Pulley close-upviewthe buck e t . T
Page 56 and 57: to them. Use a metric ruler for mea
Page 58 and 59: steel would make an excellent micro
Page 60 and 61: d ay or tw o, Ap o llo spacesuit ma
Page 63 and 64: Sleeve and Leg TesterInflated segme
Page 65 and 66: ity alone.If a scale were present,
Page 67 and 68: Exploration BriefMicrometeoroids an
Page 69 and 70: InvestigationPotato Astronaut—Par
Page 71 and 72: Exploration BriefKeeping Your CoolC
Page 73 and 74: AssessmentHave students design a gr
Page 75 and 76: InvestigationInsulating LayersIn th
Page 77 and 78: e nv i ronment experienced in Earth
Page 79 and 80: Arm Range of Movement Data SheetSub
Page 81 and 82: Body Size Range MeasurementsBased o
Page 83 and 84: ProcedureStep 1. Obtain the materia
Page 85 and 86:
Magnified view oftire valve and cla
Page 87 and 88:
Extensions• Compare the stiffness
Page 89 and 90:
2. Tethers4. Connector Seal TestPla
Page 91 and 92:
9. Vacuum Experiment - 1Obtain an e
Page 93 and 94:
You can investigate neutral buoyanc
Page 95 and 96:
MMUMercuryORUPLSSRegolithRMSSCUSkyl
Page 97 and 98:
NA S A’s Central Ope ra tion of R
Page 99:
Suited for Spacew a l k i n gA Te a
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