# Elenarohr's Blog

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## Entries in this blog

The Irondequoit roundabout is fairly new,most likely dating back to about 5 years ago. Along with new designs of roads comes the physics that are necessary to build the newest features. Probably one of the easiest physics sections to associate with these roundabouts is centripetal acceleration. As we all know centripetal acceleration is pointed inwards towards the center of the circle. for this acceleration to happen there must be a resultant force , this force is called the centripetal force.

## Why we can't hear in space

As i child i was an eavesdropper. Whenever i wasn't supposed to hear something i would always try and hear it anyways. I tried everything from pressing a glass to the door as well as (when i was desperate) just sticking my ear against the door to hear the latest gossip. Sound is transported by a collision of molecules. On earth we have the medium of air which allows the molecules to collide and form waves. this helps so that we can hear what is going on around us. The difference between space an

## Breaking laws of physics - bugs bunny

http://youtu.be/WMtA2gBch_A

## shattering glasses

Sound waves are actually very strong. Strong enough to break glasses in fact. Susan the opera singer likes to shatter glasses in her free time by using her voice. She harnesses the idea of resonance to do so. If another object having the same natural frequency is impacted by these sound waves, it may begin to vibrate at this frequency as well. As susan sings, her high pitched tone creates a sound wave that matches the frequency that matches the natural frequency of the glass. Glass resonates or

## shattering glass using sound waves

many people would think that shattering glass is easy. But shattering glass with your voice is a whole different story. The act of shattering a glass with your voice has a huge backround that involves the physics of sound waves. First off, the glass in question needs to be crystal, not just any glass. The glass hums (and doesn't shatter) because the amplitude of the waves is not sufficient to surpass the strength of the glass. in order to break the glass you must porduce a sound that has the sam

## Doppler effect

Every time a firetruck with a siren drives past the school, Mr. Fullerton says "Doppler effect." Although we were learning about what the doppler effect is, i decided to do a little more research on the topic to better my understanding of it. The doppler effect is observed when a wave is moving with respect of the observer. The doppler effect is the result of the movement of waves in which there is an apparent shift in frequency. In a video that we saw in class from a former student, it showed t

## Elenas TI selfie

i make math fun with my TI Keyboard Shortcuts Keyboard shortcuts are available for common actions and site navigation.View Keyboard ShortcutsDismiss this message Twitter FAVORITES3 5:38 PM - 11 Sep 2014Flag media Tweet text Reply to @Elena_sophiaa Trends #LHHH Urban Outfitters Ray J #Cilla #DWTS #MadeInAus Omarion #IfIWokeUpWithAmnesia Surge Scotland Â© 2014 Twitter About Help Ads info Close Ele

## catapult

I loved the catapult project. Throughout the project we examined projectiles in a creative way that helped to better my understanding of the physics of projectiles. My catapult was composed of scrap wood, springs, a lacrosse stick, and some wire. The spring was used as the initial source of energy and caused the lacrosse stick to release the softball into the air making it a projectile. Our catapult threw the softball a total of 29 meters. In order to achieve this distance, my partner and I test

## WORK

Work was a tricky subject for me when first learning it in physics class. For some reason it made me think harder than i thought i had to. the equation for work is W=(f)(d) meaning work is the force multiplied by the distance. the distance is a main part of work. take a broken down car for example. Your car was to break down and you had to push it to the nearest help station. No matter how hard you push or how sweaty you get trying- no work is done unless you are able to move the car forward. Th

## newtons laws

this video shows newtons 3 laws in a humorous way. It shows Newton's first law by demonstrating that an object at rest stays at rest and an object in motion stays in motion with the same speed and in the same direction unless acted upon by an unbalanced force. It shows Newtons 2nd law by demonstrating that acceleration is produced when a force acts on a mass. the greater the mass, the greater the force needed to accelerate the object. It shows Newtons 3rd law by showing that for every action

## friction

without friction nobody would be able to move without falling. Friction depends on two things: the nature of the surface and the normal force. There is also two categories of friction: static (not sliding) and kinetic (sliding). As you can see, in this video an excited sports fan slips on ice while being featured on the news. He slips so suddenly because the friction on ice is 0.02. Clearly the friction of ice is very slim. Another cause is that he went from the friction of the pavement to the f

## physics of diving

Within diving there is evidence of physics. For example when leaving the board it shows projectile motion. The boy creates a force down on the board which is equal to the force of the board pushing back onto the boy. Gravity also acts on the boy by pulling him down. The boy then projects because he has less mass and has nothing stopping him from projecting upwards. Therefore the reaction is the boy being projected into the air. When he comes back down and hits the water he is no longer a project

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