Transcript: Gravity attracts all objects towards each other. Gravity has been around since the very beginning of the universe, and it works the same way everywhere in the universe, on all kinds of different objects, of all different sizes (larger than atoms - those are held together by atomic forces instead). The bigger an object is, and the closer you are to it, the stronger its gravitational pull is. In the very beginning of the universe, after the Big Bang, gravity pulled atoms together to make stars and planets. Once the stars and planets had formed, gravity kept the planets in orbit around the stars, and moons orbiting around the planets. And on each planet that is large enough, gravity keeps an atmosphere around the planet. On Earth, gravity keeps the air around us (and everything else) from drifting off into space. Gravity also causes things to fall to the ground, and causes the ocean's tides, and causes hot air to rise while colder air falls (which in turn causes wind). Nobody fully understands how gravity works, or even why gravity exists. One way of looking at gravity is to think of it not as a force like magnetism, but instead as a natural result of the way mass bends space. Any object with mass (like a star) pushes on space and bends it, so that other objects (like planets) that are moving in a straight line are also going around the star. It looks to us like the star is pulling on the planet, but really the star is bending space. Another way of thinking about gravity is to think that the star and the planet are exchanging tiny particles called gravitons, that help to pull the star and the planet together. It's as if they were tossing tiny balls back and forth between them. But if the planet gets further away from the star, more of the balls get dropped and lost, and so the gravity between them is weaker. It's likely that both of these ideas are at least partly right - maybe the gravitons bend space, or maybe bending space produces gravitons. Most of the time, when people need to figure out some problem involving gravity, like how fast a ball will fall when you drop it from a tall building, they forget about why it works and just use a good-enough approximation of what gravity does. This approximation tells us that gravity at the surface of the Earth is approximately 9.8 meters per second. That means that, not counting friction with the air, if you drop a ball from a building, it will go faster by 9.8 meters/second for every second that it falls. If it begins at 0 meters/second, after one second the ball will be going 9.8 meters/second, and after two seconds it will be going 19.6 meters/second, and after three seconds it will be going 29.4 meters/second, and so on. Friction is what happens when any two things rub against each other. These can be solid things, like your two hands rubbing together, or your skis rubbing on the snow, or a hammer hitting a nail, or they can be gases, like friction with the air slowing down your car, or liquids, like friction with the water slowing down a boat. Nobody completely understands what causes friction. Partly, friction happens when the rough edges of one object snag on the rough edges of another object, and some of the objects' energy has to be used to break off those rough edges so the objects can keep moving. And when you rub two soft things together, like your hands, sometimes they squish into each other and get in each other's way. But even completely smooth, hard things have some friction. This friction is the result of the molecules in both objects being attracted to each other. We know how to make more friction or less friction, and how to predict how much friction there will be. There's more friction when the two objects are pushed together harder. If you push your hands together, it's harder to rub them up and down. If you pull the brake lever harder, your bike will stop faster. Because gravity pulls harder on things with more mass, things with more mass have more friction and are harder to move - a cube of iron will be harder to move than a cube of wood. Two solid things usually have more friction than two liquid things, or one liquid thing and a solid - that's why you slip on a wet surface more than a dry one. When two things rub against each other, they both slow down. Because energy = mass x velocity, if the objects lose velocity without gaining mass, then they have to release some energy to keep the equation equal. One way for them to release that energy is as heat - loose electrons shooting off into the air. You can feel this happen when you rub your hands together and they get warmer. When you are ice skating, the friction between your skate blades and the ice melts little tracks of water in the ice -that's what makes ice skating so slippery. Forces One of the basic features in physics is the occurrence of forces that keep matter together. There are for example, the forces that keep the cells together to build up the human body, and there is the
Transcript: I predict that... because.... In my experience... From my learning I know... What would you like to find out? Background Investigation LO: To understand and explain how gravity and air resistance act upon an object. Equipment: Scissors Several paper clips Stopwatch A safe place from which to drop the whirlybirds Conclusion Have you ever seen a helicopter flying through the air? Have you ever wondered how they fly—or if you could try flying one yourself? How and why? http://nssdc.gsfc.nasa.gov/planetary/image/featherdrop_sound.mov In this activity you will build a simple paper helicopter called a "whirlybird." Unlike a real helicopter, the whirlybird does not have a motor to make its blades spin. Due to its special shape, however, the blades will still spin as it falls. This generates additional lift that slows the whirlybird even as it drops. So, it will fall much slower than if you crumpled up the same piece of paper and dropped it. Do you think adding paper clips as weights to the whirlybird will make it fall faster? Method Helicopters http://www.bbc.co.uk/bitesize/ks2/science/physical_processes/forces/read/2/ Prediction Gravity What did you find out? Was your prediction correct? What would you do differently in your investigation next time? Can you relate your findings to your learning about Gravity? Try to use some scientific vocabulary such as air resistance, gravity, surface area and speed. Task Results Planning What do you know about Gravity? Helicopters stay in the air using spinning blades that are used to generate "lift." With enough of it, a craft can overcome the force of gravity, which pulls the object down toward Earth. Aircraft such as helicopters with spinning blades are called rotary wing, unlike traditional airplanes, which are fixed wing. Outline what you will need to do to complete the investigation. Remember to write them as instruction and be clear and concise. First Next After To ensure it is a fair test we must...
Transcript: Go on Exchange present your country abroad Work with different mentalities Diversity Explore different cultures Be a Member Develop your skills Have an impact Enrich your knowledge AIESEC Be a Leader Lead your team Achieve your vision Coach others Be a mentor EXPERIENCE YOUR AIESEC JOURNEY Gives you a great experience
Transcript: Whirlybird Whirlybird Physical Story Lookin' Steady Air Air Looking a little wobbly.. Whirlybird Whoa! We're falling! Whirlybird Energy Story Whirlybird We're cruisin'! It's windy out here! Air Wobble, Wobble! The End Air Air Whirlybird Whirlybird Air The wing got ya, huh? Whirlybird Whirlybird Air Oh my! There's less here.. Whirlybird Air Air Go birdie, go! Uh-Oh! Almost out of gravitational energy.. Physical Story Air Whirlybird Whirlybird Air =Gravitational Energy =Motion Energy = Gravitational Energy =Gravitational Energy =Motion Energy = Gravitational Energy = Motion Energy = Chemical Energy = Light Energy =Gravitational Energy =Motion Energy =Gravitational Energy =Motion Energy =Gravitational Energy =Motion Energy = Gravitational Energy =Gravitational Energy =Motion Energy =Gravitational Energy =Motion Energy =Gravitational Energy =Motion Energy =Gravitational Energy =Motion Energy
Transcript: Innovations Of the Helicopter Who Invented the helicopter? How has the Helicopter impacted the society in a Positive way? 1928 The Helicopter is in the Transportation Category ~The fuel Pollutes the air. Whirlybirds Helicopter ~It helps army troops to get to a certain place faster The helicopter is a fine way to travel, but it induces a view of the world that only God and CEOs share on a regular basis. Morley Safer Remote Control Quote Also known as the Helicopter, Chopper and Rotorcraft Helicopters actually have many uses. More than you think.they are used in war for transportation so the troops could get supplies to the ships helicopters are also used for medical transportation for patients who are dieing and that need to go to a certain hospital and get there faster. How has the Helicopter Impacted the society in a negitive way? By: Hannah-Jean Olsen And here comes the SHOCKER!! Paul Cornu ~it helps medically challenged people such as cancer patients get to a different hospital that may have certain machines or treatment that hospitals near them do not have accessibility to. Thats why theda clark has a Helicopter. Thanks For Watching :) The Hotelicopter Bealive it or not This was actually at the EAA Airventure this year!!! The Original helicopter how was it used then and now they used it just about the same as we do now mainly for war, medical purposes and transportation. The GyroCopter Igor Sikorski The Army Helicopter Purpose
Transcript: 14th Week Consulting interns can be expensive Time and Money Personal Experience Preliminary Design Stage NFPA 101 and NFPA 13 New and Existing Education, Business, and Mercantile Definition of Project This app would be used to provide interns and recent graduates with an outline of guidelines for how to design and review designs of specific occupancies. With the given time frame, I will be writing the information that will go into the app Begin parametric study: Speak with my mentor and Jason to understand more about what critical variables I could concentrate on for this app. Choose those parameters and begin my study Gather information from NFPA 101 and NFPA 13 for new and existing education, business, and mercantile occupancies. By: Breanne Thompson Next Steps (Continued) Finish preparing for Draft of Analysis Pull together and discuss results of project Draw my conclusions and state future work needed Turn in Final Paper! 10th and 11th Week Turn in my parametric study Begin draft of analysis Map out the process of the app for the key elements 15th Week References Next Steps 7th Week Prepare for Final Presentation Summarize my draft of analysis into presentation Work on how to incorporate a live demonstration for my presentation App Development Background Information 8th-9th Week Continuous Process Objective-C for Apple products Java for Android products 6 months of studying Places to Learn: Codecademy, iOS Dev Center, Android Developers Training Hire App Developer will cost thousands Prepare Final Paper Dive into Shark Tank! 1. http://lifehacker.com/5401954/programmer-101-teach-yourself-how-to-code 2. http://www.bluecloudsolutions.com/blog/cost-develop-app/ 6th Week Background Presentation 12th-13th Week
Transcript: Real action and accountability Amnesty International Non-state actors/ Rebel Groups?? ...and what about men?? ignoring male rape victims? would rape exist without a man? Weapons of War: Rape UN as an Arena - NGO's - Discussion and dialogue Arena Instrument Actor Critical Thinking Weapons of War: Rape UN as an instrument UNSC Resolution 1820 (2008) UN as an Actor - UN Action Against Sexual Violence in Conflict Weapons of War: Rape Problems with 1820 "Roles and Functions of International Organizations" "Sexual violence, when used as a tactic of war in order to deliberately target civilians or as a part of a widespread or systematic attack against civilian populations, can significantly exacerbate situations of armed conflict and may impede the restoration of international peace and security… effective steps to prevent and respond to such acts of sexual violence can significantly contribute to the maintenance of international peace and security" (UNSC Resolution 1820, p. 2)" http://www.stoprapenow.org/uploads/advocacyresources/1282164625.pdf Background Presentation- Kristin Mann Weapons of War: Rape Brief Insight - used to manipulate social control - destabilize communities - weaken ethnic groups and identities Examples: - Sudanese Militia - Rwanda Genocide - DRC Critical Thinking http://www.womenundersiegeproject.org/blog/entry/the-need-for-numbers-on-rape-in-warand-why-theyre-nearly-impossible-to-get Critical Thinking Increased Data Collection by international organizations - determine humanitarian responses - ensures justice and reparation - provides recognition and dignity
Transcript: 1 The Whirlybird Experiment The Whirlybird Experiment Abnet A (working as a pair) Partner-#1 Conducted-27-04-2021 Due and Submitted -29-04-2021 SNC1DI Instructor-Mrs. Hober-Rose Question Part 1 : if more paperclips are added to the whirlybird, then the whirlybird will fail fall because the paper clips are adding mass to the whirlybird to fall. 2 How does the number of paperclips affect the time it takes for the whirlybird to fall? Hypothesis MATERIALS Part 2 • Paper • A stopwatch • A chair • Scissors • 5 Paper clip or bobby pins • Calculator • A two-meter height ruler • pencil • The picture of the Whirlybird 3 Part 3 PROCEDURE: 1. Cut out the whirlybird along the solid lines and fold the wings on the dotted lines. 2. Drop the whirlybird from a height of about 2 metres (keep the height the same throughout the activity). Have your partner time how long it takes for it to reach the floor. Record the time it takes for the whirlybird to fall in the chart below. 3. Repeat step 2 two more times, 4. Calculate the average (add each trial and divide that number by 3) 5. Attach one paper clip to the bottom of the whirlybird to increase its mass and repeat steps 2 and 3 6. Attach two paper clips to the bottom of the whirlybird and repeat steps 2-3. 7. Attach three paper clips to the bottom of the whirlybird and repeat steps 2-3. 8. Continue, attaching 4 and then 5 paper clips to the whirlybird. 4 Part 4 Observation 5 The number of paperclips vs the average time EXPERIMENTAL DESIGN: EXPERIMENTAL DESIGN: -The Paperclips -The time it takes to fall - -The Whirlybird paper Discussion DISCUSSION: 1. Compare your results to two other groups. Describe any similarities or differences. I will compare my results to the #1 partner and the #3 partner the first partner was really similar with mine because the average of the first partner was in the first trial with 0 paper clips was about 1.87 and mine was about 1.95 and it goes on. The only difference is than I have recorded about 2 sec but, partner #1 have got only 1 sec. However, in the third group it was a bit different they first trial was 2.7sec and the number of paperclips are only 4 paperclips_ 2. If there were differences, explain why you think that may have happened. _I think that might be from various reasons like they could have not set the timer right or I also think that sometimes when you trace it from a computer it can be smaller and that might have influenced the mass of the paper. 3. What could be changed about the procedure to get better results? _For me when I was dropping the whirlybird I was changing the way I was dropping it in different way each trial and I noticed that the whirlybird paper was mostly going faster when I did it straight doing the paperclips down and the cutted sides up as you can see in the all second trial it went at least one second down. 6 The Graph The Graph LINK-https://docs.google.com/spreadsheets/d/10xITm_acNSy6BHoQhiYxMON0vs5vIY2bqA2ACDkOoEE/edit?usp=sharing
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