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Expansion & Contraction (Application in everyday life) - Coggle…
Expansion & Contraction
(Application in everyday life)
Railway
tracks
Gaps between sections
of railway tracks
provide
spaces
for tracks
to
expand on hot days
prevent tracks from
buckling
Concrete
Pavement
gaps between sections
of concrete pavement
provide
room
for concrete roads
to
expand/contract at diff temp
prevent road surface from
crackling
Pipes carrying
liq or gases
have
curved joints
or are
coiled
curved joint provide some
space for pipe to expand/contract
prevent pipe from breaking easily
Brigdes
one end is fixed,
while the other end
is a movable joint
movable joint provides space for bridge
to expand during hot days
and contract during cold days
prevent bridge from collapsing
Overhead
telephone lines/cables
cables hang
loosely
allow cables to
contract during cold days
prevent snapping
cables can't
hang too loose
cables will expand and sag during
hot days and become hazardous
Experiment on pg 73, 74
Bottles/cans are not
completely filled
to allow room for liq to expand
prevent bottles from breaking/bursting
Placing a wheel
inside a metal tyre
a metal tyre is firstly heated and expand
before the wheel is place inside it
when tyre loses heat and contracts,
wheel will fit inside metal tyre tightly
Bimetallic strip
diff rates of expansion/contraction of 2 diff metal
can close or open a circuit
(pg 72)
Uneven expansion
of 2 surfaces
result in cracking
occur when
one surface expands more
than the other surface
one surface expands while
the other surface contracts