SCIENCE UPDATE TERM THREE

haltingnosyUrban and Civil

Nov 29, 2013 (3 years and 9 months ago)

72 views

SCIENCE UPDATE

TERM THREE


Grade Ones

Topic : Materials and Structures

Overall
Expectations:


1.
assess the impact on people and the environment of objects and structures and the
materialsused in them;

2.
investigate

structures that are built for a specific purpose to see how their design and

materials suit the purpose;

3.
demonstrate an understanding that objects and structures have observable
characteristics

and are made from materials with specific properties that
determine how
they are used.


Coming Soon :

designing
a
playground

Design your own playground with at least 5 structures










Structures and Mechanisms : MOVEMENT



Understanding
movement
and ways in which
simple machine help to move
objects



Investigate mechanism that include simple machines and enable movement





Materials to collect :

Bottle caps and other round object
s

that could be used
as wheels
, empty spool (from thread, ribbon) to make pulleys


Helpful Websites : Simple Machines

ht
tp://atlantis.coe.uh.edu/archive/science/science_lessons/scienceles1/final
home.htm

http://www.mikids.com/Smachines.htm


Simple Machines

Lever, pulleys,

inclined plane,

wheel and
axle,

gear,

screw and wedge



Grade Threes

Topic : Structures

OVERALL EXPECTATIONS :

1.
assess

the importance of form, function, strength, and stability in structures through time;

2.
investigate strong and stable structures to determine how their design and materials enable

them to perform their load
-
bearing function;

3.
demonstrate an understandi
ng of the concepts of
structure
,
strength
, and
stability
and the

factors that affect them.

ASSESSMENTS FOR THIS UNIT:




Design Challenge ( Group Project)



Design and build a 50 cm tower with a platform that supports a 500 gm
weight



Structures Scrapbook ( in
Class

)



Collect picture of common structures



Unit test






STRUCTURES Fact Sheet



A structure is something that has been built and has a purpose
or a job. It has a definite shape, size and purpose and holds a
load.



Who builds structures ?

engineer,
architect, animals, construction
workers



What materials are used ?

wood ,brick, concrete, steel, ice



The stronger the materials used, the stronger the structure. The
strength of different materials can be changed by folding, adding
layers, twisting and ch
anging the shape.



Strong structures hold heavy loads. A strong structure can withstand
forces that tend to break an object or change its shape



Structures serve many purposes.



What are some types of structures ?
tent, castle, tower, bridge,
dam, tunnel, nes
t, condo, house, hospital, dock, barn, igloo, trestle,
wall, ladder, deck, dock,treehouse



Structures come in different shapes and sizes



Structures must be strong and stable ; it must stand up to the forces
that may push it. ( nature : wind, snow, rain, ear
thquakes or people)



Engineers use design features such as
struts
, triangular shapes that
withstand compression and
ties
, ropes or cables to strengthen
structures against pulling forces.

Shapes

Shapes are part of the solid world around us.

When people make
things, they often begin using a simple shape. It depends on what
they are making and what it will be used for.

Different shapes are stronger than others.

The
triangle

is the strongest shape of all. It provides more stability than any other
shape. That’s w
hy it is used to make bridges, bicycles, book shelves etc.

Two different forces act on structures :
compression
a squeezing or pushing force

and
tension

a pulling force
.





Structures must be

strong

and
stable

;
it must stand up to the
forces that may push it. ( nature : wind, snow, rain, earthquakes or
people)

Factors th
at might lead a building to be u
nstable

:



Softness of the ground on which it has been built



Improper building materials



Lack of mechanism
s

like s
trut
s

and ties to balance forces