spaghetti bridge

strenth and weakness of bridges

Arch bridges are one of the oldest types of bridges and have great natural strength. Instead of pushing straight down, the weight of an arch bridge is carried outward along the curve of the arch to the supports at each end. These supports, called the abutments, carry the load and keep the ends of the bridge from spreading out.

A beam or "girder" bridge is the simplest and most inexpensive kind of bridge. In its most basic form, a beam bridge consists of a horizontal beam that is supported at each end by piers. The weight of the beam pushes straight down on the piers.The beam itself must be strong so that it doesn't bend under its own weight and the added weight of crossing traffic. When a load pushes down on the beam, the beam's top edge is pushed together while the bottom edge is stretched .

Suspension bridges can span distances from 2,000 to 7,000 feet—far longer than any other kind of bridge. They also tend to be the most expensive to build. True to its name, a suspension bridge suspends the roadway from huge main cables, which extend from one end of the bridge to the other. These cables rest on top of high towers and are secured at each end by anchorages.

A cantilever bridge is like a springboard, with a beam (called the cantilever) projecting horizontally in space, and attached on one side. The pier to which it is attached has another beam in the opposite direction to counterbalance the weight of the cantilever. This supporting arm is called the anchor arm, as it is anchored to a solid support on its opposite end. Most cantilever bridges have two cantilevers.

Bridge Forces

        Cross country

Ready,steady,go said Mrs Leitch then ‘BANG’ went the starter blocks cracks together like a clap of thunder.

Catching up my breath. Trying to focus and trying not to fall in puddles or over sticks and stones.

Trying to remember my goal and focus on my running.

Hearing my name and hearing spectators waving and cheering, i felt amazed and relieved that i’m at the  finish line and proud

Of myself i felt relaxed after.
YAY I TRIED MY BEST

                 By HEENALI MAHARAJ Y2 CLASS 27

element convection conduction

That convection requires a medium is not the main difference, it is simply the most obvious aspect of what is a fundamentally different mechanism for transfering energy. Convection is the transfer of energy by movement of a medium, whereas radiation is the transfer of energy by, well, thermal radiation. Conduction also requires a medium, but, again, it is a fundamentally different mechanism than either convection or radiation; in this case it is the transfer of energy through a medium.

Unfortunately, analogies are hard but if you can visualize the particles involved, it would help. Picture the red hot iron you mentioned. On a molecular level, the material is emitting lots and lots of photons (hence why it is glowing red). The creation of these photons takes energy; energy from the heat of the iron. These photons leave the iron, pass through the environment, and eventually collide with some other object where they are absorbed and deposit their energy. This is radiative heat transfer. If that energy is deposited on your retina or a CCD (like in a digital camera), an image forms over time. This is how infrared goggles work and they would work equally well in high vacuum as here on earth.

In conduction, the next simplest example, there is no generation of photons (physics nerds forgive me for the sake of simplicity). The individual atoms in the object are vibrating with heat energy. As each atom gains energy from it's more energetic neighbors, so it gives up energy to its less energetic ones. Over time, the heat "travels" through the object.

In convection, the molecules of gas near the object gain energy, like in the conduction case, but those same molecules that gained energy then travel through the environment to some other location where they then give off their heat energy.

click on my link to play the game

https://studio.code.org/c/380707555

A2-learning musles

                        learning mucles
I am learning to manage distractions,because i am always sitting next to a freind that talks a lot.

How it can help me
it can help me by not sitting next to a friend, and sitting next to someone that can help me .


I am good at collaboration,because i normally let people join in the game i'm playing.



                   By heenali

cicadas

                               cicadas

The cicadas flufy nose makes it look scary,
The spikey claws stick onto anything,
The cicadas shell makes me fell relaxed,its so soft to touch,
If you look at it closely the colour is like burnt toast,
The sound makes me think somone came on a motorbike.


                                  By:Heenali