Flashcards
forces and structures flashcards
Flashcards do conjunto (37)
- 1define structureanything that can support an object or a weight
- 24 types of structuresframe
shell
mass
combination - 3examples of frame structurebicycle
Eiffel tower
pyramid
house - 4examples of shell structurestennis ball
flowerpot
coconut shells - 5examples of mass structuressnow sculptures
dams
brick wall - 6examples of combination structureshuman body
rib cage - 7external forces that act on structuresdead load
live load - 8internal forces that act on structurestension
compression
shear
bending
torsion - 9which external forces would a boat full of people in a lake be undergravity
|
buoyancy
current ---> <---- thrust - 10what external forces would affect a tentwind
TENT TENT TENT TENT
force of structure - 11define center of gravitypoint where an objects weight is centred is called the center. if supported at this point, the object would balance perfectly
- 125 types of bridgesarch
suspension
beam
truss
cantilever - 133 important facts about the arch bridgebuilt to hold heavy loads
weight is distributed by compression along the arch
each piece of material pushes against each-other - 143 important facts about the suspension bridgetall towers support cables that hold bridges up
very expensive to make
the Brooklyn bridge is the first suspension bridge - 153 important facts about the beam bridgemost common
flat and supported on both ends
longer beam bridges use a vertical support beam - 163 important facts about the cantilever bridgeonly supported on 1 side
can be moved
easiest bridge to build b/c it doesn't need to be supported during construction - 173 important facts about the truss bridgea frame made mostly of triangles
uses materials effectively
usually made of steel - 18what's structural fatiguedefinition- forces and conditions that cause a structure to weaken over time.
examples- rotting wood
cracked brick
rustling metal - 19what is structural failuredefinition- structure fails/breaks completely
examples- bridge collapse
fallen tree
broken tree - 20what bridge failed in 1940 where was this bridge why did it fail what did engineers do to try and stabilize it how much did it moveTacoma Narrows bridge
located in Washington state
due to aeroelastic flutter
adding trusses and opening below road decks to increase oscillation
40 miles per-hour - 21how have scientists been trying to correct the lean on the tower of pisacurve it upwards.
- 223 methods that have been used to attempt to correct the leanadding lead counterweights to the base
dug a walkway around the base to examine
injected mortar to strengthen base - 23which method proved effective for the tower of pisadrilled and removed soil from under the tower and counter balanced the tower with 600 tons of lead ingots and anchored the base with steel cables
- 24pros and cons about boltspros:
simple design
low cost
high strength
cons:
more weight
effect of vibration
more space required - 25pros and cons about screwspros:
easy removal
very strong
resistance to rust
cons:
material destruction
very noticeable - 26pros and cons about nailspros:
affordable
long lifespan
non-toxic
cons:
aren't easy to remove - 27what's a tie give examplesties 2 pieces together
examples:
thread
string
rope - 28adhesive meaning give examplessticky substance
examples:
white glue - 29example of rigid and mobile jointsrigid:
ties
fasteners
adhesive
mobile:
door hinges
elbows
hip - 30different types of beamsI
L
T
box - 31which beam shape is the strongest and whyH beam.
thicker
center
web - 32famous structure where it is made out of when it was built built out offalling water
Pennsylvania
april 1936
stone, concrete, steel, glass, wood - 33truss bridge
- 34arch bridge
- 35cantilever bridge
- 36beam bridge
- 37suspension bridge
Informações
- Descrição
- Grade 7 science FlashCards sobre forces and structures flashcards, criado por Kulraj Sandhu em 17-06-2022.
- Criado por
- Kulraj Sandhu
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