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Transcript of SkyDiving
Images from Shutterstock.com Weight and Mass Mass is the matter of stuff in an object. Weight is the force of gravity pulling down on an object. Velocity Sky Diving Kursplat INC. by: Biley Abatiyow, Amy Wu, Betsabe Sarabia, Yonas Kidanemariam Force And Acceleration Your mass doesn't change even if you are on a different planet. Weight can get higher or lower depending on the the planet you are on. What is skydiving? Gravitational pull depends on the mass of the planet. What is velocity? Well velocity is just speed with direction. The equation is d/t +direction=v D= is the distance
T= the time A man jumps off the plane and falls 44 meters (m). It takes him 4 seconds to fall this distance. What is the velocity? Don't forget to include direction! 44/4=v 11m/s^2 He is going down. (direction) Force And Acceleration what is acceleration? Well here are somethings you should know about before you go skydiving. The increase of speed. An object can be accelerating but is at a constant speed.
You can do this by changing direction. What is force? F=ma Mass * Acceleration A person with a mass of 87kg has decided to go skydiving for his birthday. One moment while he is falling there is a buoyant force of 40N. Calculate his net force. We know that velocity vector is magnitude and speed. So acceleration has to do with the velocity vector which is constant in magnitude but changing in direction. His net force would be 812.6N Then the direction the object is going. So how safe is skydiving? Citations Skydiving is pretty safe if you ask me. Here are some facts. In 2010, 1,308 USPA members reported skydiving injuries requiring medical attention. During the same year, first-time students made roughly 3 million jumps. That’s roughly four injuries per 10,000 skydives. Most skydiving accidents result from human error. We hope this helped you feel better about skydiving. 1."Acceleration." Acceleration. Compadre, n.d. Web. 10 Dec. 2012. <http://www.physicsclassroom.com/class/circles/u6l1b.cfm>.
2. "Skydiving Safety." Skydiving Safety. United States Parachute Association, n.d. Web. 10 Dec. 2012. <http://www.uspa.org/AboutSkydiving/SkydivingSafety/tabid/526/Default.aspx>. 3. "Speed and Velocity." Speed and Velocity. ComPADRE., 2012. Web. 12 Dec. 2012. <http://www.physicsclassroom.com/class/1dkin/u1l1d.cfm>.
4."Seattle, Washington's (WA) Premier Skydiving Center! | Skydive Snohomish." Skydive Snohomish. Group Member US Parachute Association, 2012. Web. 10 Dec. 2012. Gravity, Buoyant Force and Terminal Velocity Gravity is the force that attracts a body toward the center of the earth, or toward any other physical body having mass. Buoyancy is an upward acting force, caused by fluid pressure. Fluid is liquid or gas. Terminal velocity is the term for the state an object reaches when the force of drag acting on it is equal to the force of gravity acting on it. An object with less mass can speed up quicker than a more massive object subject to the same force. "Terminal Velocity." Fluid Friction. N.p., n.d. Web. 15 Dec. 2012. <http://hyperphysics.phy-astr.gsu.edu/hbase/airfri2.html>. McGuigan, Brendan, and Bronwyn Harris. "What Is Terminal Velocity." WiseGeek. Conjecture, 19 Nov. 2012. Web. 15 Dec. 2012. <http://www.wisegeek.com/what-is-terminal-velocity.htm>.
"Skydive Kapowsin - Seattle Tacoma Olympia Washington's #1 Skydive Center." Skydive Kapowsin - Seattle Tacoma Olympia Washington's #1 Skydive Center. N.p., n.d. Web. 10 Dec. 2012. We will give you some safety tips on skydiving and help you understand with science. Conclusion So what does all of this mean? Drag Interactions Drag interactions occur when an object moves through a fluid like a gas or liquid. When you are skydiving gravity pulls you down and buoyant force pushes you up. Terminal Velocity can happen when pull your parachute and it pulls you up. How The Parachute Works Interesting fact: The word parachute comes from french-latin mix, para- which means "against" and chute for "fall". Parachute have the air resistance, which prevents people from falling down. Its catches lots of air in it as it falls down, thereby creating so much of a drag. The larger the surface area, the more drag it has. Balanced and Unbalanced Forces Balanced forces are two forces that are of equal magnitude and in opposite directions, they balance each other. Unbalanced force is when one force is bigger than the other force. Examples of balanced force is when a person is standing like this v = x2-x1/ t2-t1 An unbalanced force is a race car going 100mph and accelerating. The force of friction would be smaller than the force of the car which is a lot bigger. "Balanced and Unbalanced Forces." Balanced and Unbalanced Forces. ComPADRE, n.d. Web. 19 Dec. 2012. <http://www.physicsclassroom.com/class/newtlaws/u2l1d.cfm>. Story Problem A sport which you jump off of a plane and pull a parachute before you hit the ground. If a person falls from a height of 75 meters and it takes 15 seconds, what is their velocity? What is their speed? The velocity is 5m/s Well we all know that earths gravitational pull is 9.8m/s^2 Most of these things we talked about can happen while skydiving. Like drag interactions, terminal velocity and etc. Knowing all of this helps us find out how skydiving actually works. 75meter If a boy is falling with a mass of 200kg. As he is falling his parachute opens which makes a buoyant force of 57N. What is the net force? 200kg * 9.8m/s^2 = 1960N 1960N-57N= 1903N 57N 9.8s/m^2