...When we hear the world collision the first thing we think is crash. In scientific words collision occurs when more than two objects collide against each other as a result, the born of many physics forces like momentum, impulse, inertia and friction. But what is the relationship between collision and a car crash? What we may not notice is that physics is all around us in our life and every life event involves its. The path we take every morning in our way to school, the traveling of the car is a very good example. Studies prove and affirm that the survivors of severe car crashes, survive thanks to the way of protection they used and how is the car designed with specific and special safety precautions. That was our main point we wanted to achieve while making our car for the project. Our design was basically a truck like a jeep. It was all made up of carboard, wood and other small details that beenfit the truck to make it heavier, more rough and hard. It was also covered with newspaper, as a result, giving the car a very hard texture. The passengers seat, was made up all of soft materials like cotton, pads and sponges. The egg was attached with two rubber strings, simulating a safety seat bealt and helping as a support for the egg. All this details and spefcific design had a main goal and something specific to achieve: preventing the egg from breaking and keep it secure in its seat. The demostration of collision and all its forces acting against in this experiment consisted...
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...A collision occurs when two objects collide together creating an external force that is either zero or smaller. The goals of this lab were to find out what happens to the linear momentum and kinetic energy of different objects when they collide. Also, what happens to the momentum and kinetic energy in a completely inelastic collision and perfectly elastic collision? For completely inelastic collision the linear momentum should be conserved, but the kinetic energy should not be conserved. On the other hand, the linear momentum and the kinetic energy should both be conserved during perfectly elastic collision. Kf / Ko should equal one for perfectly elastic collision and, it should equal the mass of 1 divided by the sum of the mass 1 and 2 for...
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...to spend the rest of his life in hell, just to be able to hang with his wife for eternity. The movie begins with the encounter of the two soul mates, both who were spending their time on their sailboats, one of which had a red sail symbolizing seduction, love, sexuality, but also sacrifice and danger, the boat was owned by Annabella Sciorra who is played by Annie Nielsen , who happens to be Chris’ wife later on the movie. They strongly fall in love with each other and they had 2 children, Ian and Marie , played by Josh Paddock and Jessica Brooks Grant, both who died after being involved in a collision and the tragic event destroys Annabella and Chris’ life by leaving an empty space in their heart. The quietness of their house and the uncertainty of their future made Anabella have a mental breakdown and after going through a rough path, his husband (who is a doctor), dies in an car collision accident; while he was trying to save someone who was trapped inside their car after being flipped over by impact of his car and the other vehicles colliding. After this other tragedy she sees suicide as her only escape from that nightmare and without knowing the “rules” of heaven she kills herself condemning her soul to an eternity in hell and without any chance of seeing paradise and her family. Chris Nielsen is a perseverant and secure...
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...driving. In today’s world, car collisions are one of the major causes on deaths in the United States. Thousands of people die every year from car collisions due to driver error, some of which are: drinking and driving, texting while driving, and not wearing a safety belt. The Alive at 25 course is meant to teach young adults the hazards that come with unsafe driving, in the hopes that they will become better and safer drivers so that they will not end up in the emergency room or the morgue due to a car collision. In this essay, I will cover some of the main topics we discussed in the Alive at 25 course and I will outline what I have learned from this material. One of the first topics we discussed in class was some of the statistics that have been developed in regards to car collisions within specific age groups. The Alive at 25 course focuses on the 15-24 year old age group, this group is known as Group 1, as people in this age group are the youngest amongst drivers in the United States. Motor vehicle crashes are the number one cause of death of 15-24 year olds with almost 11,000 people dying every year. We also discussed some percentages of drivers who are considered Group 1 (age 15-25), drivers in this age group consist of: 14% of licensed drivers, 27% of all people involved in collisions, 21% of people who die from collisions with other vehicles, 34% of people who die from collisions with fixed objects, 28% of people who die from non-collision events (such as a car flipping)...
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...Introduction When an object collides with another, momentum is conserved, but kinetic energy is not. This experiment was designed to find if the coefficient of restitution, e, changes for high-velocity collisions. At low velocities colliding objects will tend to maintain their shape, size and elasticity, so e is likely to be constant over a range. However, at high velocities colliding objects may change their physical properties and therefore a change (probably a reduction) in e may be observed. A small reduction in e was observed, but this was probably accounted for by air resistance and not a change in the material. Theory When a collision occurs, total momentum is conserved, but kinetic energy is not. When a ball, for example, bounces off the floor, it loses a little momentum to the Earth so the total momentum of the system is unchanged. Its KE, given by the formula [pic], assuming it was dropped from rest, will reduce and it will bounce to a height lower than its original height, as shown in diagram 1: Diagram 1: ‘H’ is drop height and ‘h’ is bounce height. The coefficient of restitution is the ratio of the difference in the initial speed and the final speed: (i) is the general formula for e, (ii) is when distances are measured on a drop (one object is stationary), and (iii) is when velocities are measured and one of the objects is stationary. Equation (ii) will be used here. Method Apparatus: Rubber ball, camera, floor...
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...------------------------------------------------- Experiment 9 – Conservation of Linear Momnetum [Document subtitle] March 29, 2016 Engineering Physics 150 March 29, 2016 Engineering Physics 150 Objectives: The objectives of this laboratory experiment is to investigate the velocities and momentm of two carts before and after various types of collisions. Theory: * When objects collide and assuming there are no external forces are acting on the colliding objects, the principle of the conservation of momentum always holds. * For a two-object collision, momentum conservation is stated mathematically by the equation: * PTotali =PTotalf * m1v1i+m2v2i=m1v1f+m2v2f * When working with a complete inelastic collision, the two objects stick together after the collision, and the momentum conservation equation becomes: * PTotali =PTotalf * m1v1i+m2v2i=(m1+m2)vf * During this experiment, photogates will measure the motion of two carts before and after elastic collision. The cart masses can be measured by using a simple mass scale. * Then, total momentum of the two carts before collision will be compared to the total momentum of the two carts after collision. Equipment: 850 Universal | Dynamic Track | Two dynamic carts | Two picket fences | Mounting brackets | Mass Balance | Mass Bar | Two Photogates | Data: Part A – Elastic Collision with approx. equal masses: Trial | V1 i (m/s) | V2 i (m/s) | V1 f (m/s) | V2 f (m/s) | 1 | .310 | 0 | 0 | .287...
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...When you throw a football across the field to your friend, you are using physics. You make calculations for all the situations that can occur, such as: distance, wind and weight of the ball. The farther away your object is, the harder you have to throw the ball, or the steeper the angle of your throw, as if your object is on top of a hill and you was at the bottom of the hill. This calculation is done in your mind, and it’s called physics. You just don’t call it that because it’s so natural. Physics the branch of science concerned with the nature and properties of matter and energy. The branch of physics that is most relevant to football is mechanics. Watching a football game could be teaching you something other than who threw the...
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...PHYSIC AL CONSTANTS CONSTANT Speed of light Elementary charge Electron mass Proton mass Gravitational constant Permeability constant Permittivity constant Boltzmann’s constant Universal gas constant Stefan–Boltzmann constant Planck’s constant Avogadro’s number Bohr radius SYMBOL c e me mp G m0 P0 k R s h 15 2p"2 NA a0 THREE-FIGURE VALUE 3.003108 m/s 1.60310219 C 9.11310231 kg 1.67310227 kg 6.67310211 N # m2/kg 2 1.2631026 N/A2 1H/m2 8.85310212 C 2/N # m2 1F/m2 1.38310223 J/K 8.31 J/K # mol 5.6731028 W/m2 # K4 6.63310234 J # s 6.0231023 mol21 5.29310211 m BEST KNOWN VALUE* 299 792 458 m/s (exact) 1.602 176 4871402 310219 C 9.109 382 151452 310231 kg 1.672 621 6371832 310227 kg 6.674 281672 310211 N # m2/kg 2 4p31027 (exact) 1/m0c2 (exact) 1.380 65041242 310223 J/K 8.314 4721152 J/K # mol 5.670 4001402 31028 W/m2 # K4 6.626 068 961332 310234 J # s 6.022 141 791302 31023 mol21 5.291 772 08591362 310211 m *Parentheses indicate uncertainties in last decimal places. Source: U.S. National Institute of Standards and Technology, 2007 values SI PREFIXES POWER 1024 1021 1018 1015 1012 109 106 103 102 101 100 1021 1022 1023 1026 1029 10212 10215 10218 10221 10224 THE GREEK ALPHABET PREFIX yotta zetta exa peta tera giga mega kilo hecto deca — deci centi milli micro nano pico femto atto zepto yocto SYMBOL Y Z E P T G M k h da — d c m μ n p f a z y Alpha ...
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...a good life. “Epicurus believed that the greatest sources of human unhappiness, apart from bodily pain, are fear of the gods and anxiety about punishment after death (“Mechanical Philosophy”).” His version of atomism is how the conclusion of a human soul is material, composed of atoms that are very small came up in science. Soon after Epicurus claimed this was true he exposed that the gods’ could not interfere with human lives. Mechanical philosophy relied on the notion of contact action between bodies in motion for its explanatory force. As read in the module, there are three essential claims to the mechanical philosophy. “One, nature consists of nothing but matter and motion. Two, all causation occurs through contact (impact, collision, pressure, etc). Three, there is a...
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...people: if they are not disciplined enough they could miss evidence or could arrest the wrong person because they couldn’t be bothered to work properly.(Codes of Professionalism) They need discipline so that they can report to emergencies properly and on time, like at a robbery: if they don’t get there on time they could miss the suspect or if they go there not paying attention someone could get hurt, whether that be hostages or people in the street. Fire and Rescue – Fire and rescue services like the Fire brigade need discipline because if they didn’t, the chance of people being harmed and the chance of accidents rises. They need discipline because they need to be able to get to accidents quickly, like getting to a fire or getting to a collision: if they are not disciplined, they could be on call and an accident could happen and they would just casually take their time getting there, people could die or be harmed. They need to be disciplined because they need to follow the rules ‘by the book’ because the rules have been made to save lives: if they have no discipline...
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...One copy of the lab report Physics 1030L/ Section 2 Conservation of Momentum Lab performed: 2/18/13 Report submitted: 2/20/13 Sample Calculations Results The magnitudes of the masses for the gliders before the collision were: mass XA1 is equal to 0.107m, and mass XB1 is equal to 0.101m. The magnitudes after the collision of the masses were: mass XA2 equal to 0.0890m, and mass XB2 equal to 0.0820m. The momentum of the masses before collision were: mass PA1 equal to 0.3737 (kg m/s), and mass PB1 equal to 0.3551(kg m/s). The momentum after collision of the masses were: PA2 equal to 0.3109 (kg m/s), and mass PB2 equal to 0.2886 (kg m/s). When considering the direction of the vectors the area of uncertainty is small when considering the area of both parallelograms of uncertainty, because the overlapping of the parallelograms is only a small portion of each. The momentum was partially conserved within the error range of the parallelograms, or the portion where they overlap. Conclusions 1. It is necessary that they glide on a cushion of air, so that they can avoid any friction which would slow down their movement and could possibly keep them from colliding. The friction would differ for each mass, and would change all the predicted values. If the masses were not on an air cushion, it is impossible to predict that the two masses would ever collide because of the differing frictions for each mass. 2.If the masses were...
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...To explain the photoelectric effect, Einstein came up with the photon hypothesis. The energy of a photon is associated with its frequency with the relation (1.1) Where h is the Planck constant. And to solve the paradox that electrons goes around the nuclear without electromagnetic radiation, Bohr put forward the atom model. In this theory the electrons have stationary orbits (1.2) Where is called the reduced mass. When the electrons transit from the high energy levels to the lower ones, the energy of the photons emitted is just the energy difference between two levels. In terms of the wavenumber 1.2 The Pickering Series and the Hydrogen-like Ions In our textbook the Modern Atomic and Nuclear Physics by Fujia Yang it talked about the hydrogen-like ions. And the first well-researched hydrogen-like atom is the helium ions, and this ion...
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...Introductory Physics I Elementary Mechanics by Robert G. Brown Duke University Physics Department Durham, NC 27708-0305 rgb@phy.duke.edu Copyright Notice Copyright Robert G. Brown 1993, 2007, 2013 Notice This physics textbook is designed to support my personal teaching activities at Duke University, in particular teaching its Physics 141/142, 151/152, or 161/162 series (Introductory Physics for life science majors, engineers, or potential physics majors, respectively). It is freely available in its entirety in a downloadable PDF form or to be read online at: http://www.phy.duke.edu/∼rgb/Class/intro physics 1.php It is also available in an inexpensive (really!) print version via Lulu press here: http://www.lulu.com/shop/product-21186588.html where readers/users can voluntarily help support or reward the author by purchasing either this paper copy or one of the even more inexpensive electronic copies. By making the book available in these various media at a cost ranging from free to cheap, I enable the text can be used by students all over the world where each student can pay (or not) according to their means. Nevertheless, I am hoping that students who truly find this work useful will purchase a copy through Lulu or a bookseller (when the latter option becomes available), if only to help subsidize me while I continue to write inexpensive textbooks in physics or other subjects. This textbook is organized for ease of presentation and ease of learning. In particular, they are...
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...Steven Weinberg: “Against Philosophy” (from “Dreams of a Final Theory”). Physicists get so much help from subjective and often vague aesthetic judgments that it might be expected that we would be helped also by philosophy, out of which after all our science evolved. Can philosophy give us any guidance toward a final theory? The value today of philosophy to physics seems to me to be something like the value of early nation-states to their peoples. It is only a small exaggeration to say that, until the introduction of the post office, the chief service of nation-states was to protect their peoples from other nation-states. The insights of philosophers have occasionally benefited physicists, but generally in a negative fashion—by protecting them from the preconceptions of other philosophers. I do not want to draw the lesson here that physics is best done without preconceptions. At any one moment there are so many things that might be done, so many accepted principles that might be challenged, that without some guidance from our preconceptions one could do nothing at all. It is just that philosophical principles have not generally provided us with the right preconceptions. In our hunt for the final theory, physicists are more like hounds than hawks; we have become good at sniffing around on the ground for traces of the beauty we expect in the laws of nature, but we do not seem to be able to see the path to the truth from the heights of philosophy. Physicists do of...
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...Problem Statement The current network does not meet the needs of the school. The current network also has a significant impact on production. The network will need to be re-engineered to address the key stake holders concerns. Interviewing the stakeholders resulted in the following areas of concern: 1. The network cannot support multiple users doing the same task. Collisions are occurring on a regular basis and the band is insufficient. 2. No central management for the 50 networked printers and there queues. 3. Current bandwidth is 10 Mbps 4. HVAC technician would like wireless access points 5. The 23 new classrooms are not on the network 6. New wing has slow connections to the mail server 7. The IT Director would like to to integrate VoIP into the current data network 8. Backbone miss-cabled Solution The correction of the limited bandwidth is the first priority. Re-cabling the current network with Category 6 UTP 1000Base F Ethernet cabling because it increases maximum data rate, from 10 Mbps to 1 Gbps. Ethernet will also allow for the use of Carrier Sense Multiple Access with Collision Detection (CSMA/CD) which can be assigned on the workstation NIC. This bandwidth increase will resolve the HVAC Technicians access issue, congestion issues for the classrooms, allows for VoIP integration and provides for future expansion. Replacing the twisted-pair on the backbone with Fiber 1000Based-F will give continued Gigabit throughput and eliminate the remote mail server...
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