Helmet Article
Why Are Helmets A Necessity?
The biggest reason you should wear a helmet : It will significantly lessen the force of your impact when and if you fall. If you google “bike helmets are": the suggested/most popular searches are “bike helmets are gay” ”useless” ”dangerous” ”ugly
There is a bad culture around bike helmets (no one likes them)
1989 study proved that whoever wore helmets had 85% less head injury 88%had less brain injury.
1978-San Diego County
6% bike
10% motorbike
15% vehicle-pedestrian
16% non vehicle/non bike
53% motor vehicles
Are Helmets A Risk To Your Health?
You will still get an injury even if you wear a helmet
Your head is exposed at all times biking and other sports aren’t special
We don’t need to wear helmets when we are walking down stairs or running on the sidewalk
There is always a risk and sports aren’t an exception
1978-San Diego County
6% bike
10% motorbike
15% vehicle-pedestrian
16% non vehicle/non bike
53% motor vehicles
2001-New York Times article-rate of bike head injuries had risen 51% over ten years
False sense of security for biker...take more risks (more vulnerable to getting injuries)
more helmets=less bikers=more danger...cars aren’t watching out for bikers
How do you use this knowledge in life?
When you are doing outdoor activities and playing sports you should make sure you have the right gear. For example, when you are skateboarding you should have the correct gear: elbow and knee pad/guards, helmet, wrist guards. These help prevent many accidents. According to Howie Chong 88% of people who decide to wear helmets receive less brain injury and 85% receive less head injury. There is a lot of contraversy around helmets and just because you want to do a sport, like skateboarding, doesn’t mean that you cna’t wear a helmet. Helmets expand the time that force is applied to you head and this helps the impact to your head and brain less. Now just because helmets are”uncool” doesn’t mean that you are unable to do the same tricks as your friends.
Citations
http://orthoinfo.aaos.org/topic.cfm?topic=a00273
http://www.denverpost.com/youthsports/ci_6482662
http://www.howiechong.com/journal/2014/2/bike-helmets#.VIpHahs5CP8
http://www.washingtonpost.com/blogs/innovations/wp/2014/05/15/why-you-should-always-wear-a-bike-helmet-in-one-chart/
The biggest reason you should wear a helmet : It will significantly lessen the force of your impact when and if you fall. If you google “bike helmets are": the suggested/most popular searches are “bike helmets are gay” ”useless” ”dangerous” ”ugly
There is a bad culture around bike helmets (no one likes them)
1989 study proved that whoever wore helmets had 85% less head injury 88%had less brain injury.
1978-San Diego County
6% bike
10% motorbike
15% vehicle-pedestrian
16% non vehicle/non bike
53% motor vehicles
Are Helmets A Risk To Your Health?
You will still get an injury even if you wear a helmet
Your head is exposed at all times biking and other sports aren’t special
We don’t need to wear helmets when we are walking down stairs or running on the sidewalk
There is always a risk and sports aren’t an exception
1978-San Diego County
6% bike
10% motorbike
15% vehicle-pedestrian
16% non vehicle/non bike
53% motor vehicles
2001-New York Times article-rate of bike head injuries had risen 51% over ten years
False sense of security for biker...take more risks (more vulnerable to getting injuries)
more helmets=less bikers=more danger...cars aren’t watching out for bikers
How do you use this knowledge in life?
When you are doing outdoor activities and playing sports you should make sure you have the right gear. For example, when you are skateboarding you should have the correct gear: elbow and knee pad/guards, helmet, wrist guards. These help prevent many accidents. According to Howie Chong 88% of people who decide to wear helmets receive less brain injury and 85% receive less head injury. There is a lot of contraversy around helmets and just because you want to do a sport, like skateboarding, doesn’t mean that you cna’t wear a helmet. Helmets expand the time that force is applied to you head and this helps the impact to your head and brain less. Now just because helmets are”uncool” doesn’t mean that you are unable to do the same tricks as your friends.
Citations
http://orthoinfo.aaos.org/topic.cfm?topic=a00273
http://www.denverpost.com/youthsports/ci_6482662
http://www.howiechong.com/journal/2014/2/bike-helmets#.VIpHahs5CP8
http://www.washingtonpost.com/blogs/innovations/wp/2014/05/15/why-you-should-always-wear-a-bike-helmet-in-one-chart/
Rocket Project Summary
Rocket Project Summary
By: Caitlyn Mulcahy
This project was a really fun, informative, and enjoyable. My team consisted of Sabina Albright, Taylor Park, and myself, Caity Mulcahy. Our rocket’s name was rarity. We built this rocket by with these materials: two two liter bottles, some duct tape, hot glue, cardboard, and some paint. We cut one of the two liter bottles about half way. Then we put the uncut one into the cut one so that there were two chambers. This would allow more pressure to build up and get us to get the rocket to go higher. After we put the rockets in the place we wanted them to connect we hot glued them. We tried to make sure that it would be airtight so we hot glued all around the area to make sure. We also duct taped the two bottles together so that any air that escapes from the hot glue was trapped. After that we cut little triangles out of the cardboard so that we had fins to help make the rocket would be aerodynamic. After this we had to figure out what amount of water we needed to put into the rocket. You can’t put too much into the rocket because then you won't be able to build up pressure, but you do need to have enough water to break gravity and get up into the air. We did some testing and found out that 750 grams of water worked pretty well for our rocket. Our variable that we were testing was pressure. We wanted to see if there was a breaking point, as in if there was a point where there was too much pressure that it didn’t work and what was the pressure under that works the best, but doesn’t kill our rocket. We only did three test and found out that 100 psi worked the best for our rocket.
Some difficulties that we had were putting the rocket together. We really didn’t know how to approach this. Our first rocket was just two bottles glued together. I used a really hot glue gun and the glue melted the bottle. I asked my mom for some help and she helped me get some ideas that would actually work. After we got some ideas on paper we put the rocket together, this one was a success and we did the testing on this one.
The data that we got for testing the pressure was:
PSI ANGLE OF HEIGHT ROCKET MASS WATER(grams) HANG TIME(sec)
60 62 135 750 3.52
70 65 135 750 4.37
90 78 135 750 6.32
100 82 135 750 7.82
In conclusion I had a lot of fun with this project. I learned a lot about how the fins work on a rocket and how the mass and pressure effects the rocket. I learned that there are many factors you have to think about when you do a project like this one.
By: Caitlyn Mulcahy
This project was a really fun, informative, and enjoyable. My team consisted of Sabina Albright, Taylor Park, and myself, Caity Mulcahy. Our rocket’s name was rarity. We built this rocket by with these materials: two two liter bottles, some duct tape, hot glue, cardboard, and some paint. We cut one of the two liter bottles about half way. Then we put the uncut one into the cut one so that there were two chambers. This would allow more pressure to build up and get us to get the rocket to go higher. After we put the rockets in the place we wanted them to connect we hot glued them. We tried to make sure that it would be airtight so we hot glued all around the area to make sure. We also duct taped the two bottles together so that any air that escapes from the hot glue was trapped. After that we cut little triangles out of the cardboard so that we had fins to help make the rocket would be aerodynamic. After this we had to figure out what amount of water we needed to put into the rocket. You can’t put too much into the rocket because then you won't be able to build up pressure, but you do need to have enough water to break gravity and get up into the air. We did some testing and found out that 750 grams of water worked pretty well for our rocket. Our variable that we were testing was pressure. We wanted to see if there was a breaking point, as in if there was a point where there was too much pressure that it didn’t work and what was the pressure under that works the best, but doesn’t kill our rocket. We only did three test and found out that 100 psi worked the best for our rocket.
Some difficulties that we had were putting the rocket together. We really didn’t know how to approach this. Our first rocket was just two bottles glued together. I used a really hot glue gun and the glue melted the bottle. I asked my mom for some help and she helped me get some ideas that would actually work. After we got some ideas on paper we put the rocket together, this one was a success and we did the testing on this one.
The data that we got for testing the pressure was:
PSI ANGLE OF HEIGHT ROCKET MASS WATER(grams) HANG TIME(sec)
60 62 135 750 3.52
70 65 135 750 4.37
90 78 135 750 6.32
100 82 135 750 7.82
In conclusion I had a lot of fun with this project. I learned a lot about how the fins work on a rocket and how the mass and pressure effects the rocket. I learned that there are many factors you have to think about when you do a project like this one.