Science unit 3

made by man,modeled after natural

can be made by pilling up, forming similar materials into a shape or deisgn

held in place by its own weight,

heavy to stay in place, not heavy enough to compact the earth evenly, thick, cant be pushed, anchored firmly

support the load of the building

divide up space inside the building

easy to build, design, inexpensive, most common construction choice

keep their shape, support loads, ex. igloos, caves

small,weaker than frame structures, can be built in only some locations, difficult to make

foot ball helmet-shell,frame hydro dame- mass,frame

containing,transporting,sheltering,supporting,lifting,fastening,separating,communication,breaking,holding

looks good, nature often primary when designing,

all structures are designed and built to the acceptable safety standards(codes)

the more aesthetically pleasing-more expensive, different products, have different values

made up of more than 1 type of material, varying strengths

applied force in the form of a pull

in the form of a pinch, or squeeze, forces are measured in Newtons(N)

laminate process called lamination often used to create strength, can be more costly

weaving and knitting often ass strength to materials, accomplished by loom, fit well and complex shapes

you must weigh out the adv/dis adv. of materials

cost-will cheap material perform same functions, appearance, environmental impact

fastening that holds parts together can allow/prevent movement

allows movement

to fix an object in place

nails,bolts,staples,rivets,holes in structures, weaken,

carefully shaped shapes that interlock themselves, lego

a device used to add strength to a structure

sticky substances hod things together, hot glue,

pieces of metal or plastics can be melted together,welding,soldering,brayzing

stays the same- is the amount of matter an object is made of its weight is the forces w/ gravity pulls an object

is used to measured the amount of mass in a particular substances

is to push/pull an object, measured in newtons

a measurement force relation to gravity

describes direction of the forces acting on a object

permanent force acting on a structure (Gravity)

changing force that acts on an object (wind)

is the force felt on that occurs when an object is stretched

is the max. force that an object can uphold before it breaks

the force that squishes an object

is the max. withstand before deforming

a force that when applied will tear the material apart

materials ability to resist shear force, max shear strength occurs just before materials tear

are forces that cause an object to twist,

external force on structures