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Research about friction
Fluid friction lab
Research about friction
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1.1 Historical Development
Famous people who studied frictional forces
Leonardo da Vinci (1452-1519)
He studied objects to discover what affected their ability to move on surfaces. He never published his theories therefore has never received credit for his findings.
Guillaume Amontons (1663-1705)
He studied friction to discover that friction was the affect two surfaces had on each other.
Charles August Coulomb (1736-1806)
He continued Amontons studies to add to the second law of friction.
F. Philip Bowden and David Tabor
They investigated friction to discover that friction is related to the true area of contact surface.
1.2 Scientific Ideas
Scientists see friction as being divided into five different sub groups: dry friction, fluid friction, lubricated friction, skin friction and internal friction. There are three laws developed from scientific study: Amontons' First Law: The force of friction is directly proportional to the applied load, Amontons' Second Law: The force of friction is independent of the apparent area of contact, Coulomb's Law of Friction: Kinetic friction is indepen...
1) A stationary body will stay stationary unless an external force is applied to it; 2) Force is equal to mass times acceleration, and a change in motion is proportional to the force applied; and 3) For every action, there is an equal and opposite reaction. (Bio.org, 2017) He invented the optics which he helped to inspire the build of the
There he inspired many students and tutored them to become professionals in the medical field. Many of these students included Fabricius ab Aquapendente (gave the first clear description of the semi lunar valves of the veins, which later provided many people with a crucial point in his famous argument for circulation of the blood) and Volcher Coiter (described human embryology as well as the comparative osteology of animals and illustrated his own work.... ... middle of paper ...
Table 1 represents the mass of the block that was used throughout this experiment, which was found to be 0.467kg. In Table 2, the normal force and peak static frictional force were found for the wooden block alone (Table 1) and when it had 500g or 1000g of additional weight. To calculate the normal force, the weight of the block (including the weights added if applicable) was multiplied by gravity. As shown in Table 2, when no additional weight were added to the block, the normal force was 4.58N and the peak static friction was 1.775N. When 500g of weight was added to the block the normal force was 9.48N and the average peak static friction was 3.688N. Then, when 1000g was added to the block the normal force was 14.38N and the average peak static friction was 5.391N. Figure 2 demonstrates the results of the average peak static friction values vs. the normal force,
He finished his doctorate, started concentrating on identity. It is said that he was the first teacher to instruct a school level course on identity hypothesis, a course that today is required by about all undergrad brain science majors.
In my opinion police are officers are not allowed too much discretion. Just as citizens can decide to obey the laws or not, police agencies and their officers can decide which offenses to actively seek to control and which offenses to simply ignore, which services to provide and what level. The ability to use discretion is, indeed, a vital element of contemporary American policing. The police have so many duties to perform and such limited resources that good judgment must be exercised in when, where, and how they enforce the law. The less serious a crime is to the public, the less pressure is placed on the police for enforcement. Police discretion is frequently at the center of issues involving discrimination, racial profiling, use of force and pursuit. (Page 397-399)
...ostly remembered for his eccentric lifestyle. His prosthetic nose made of precious metals is a familiar tale. The story of his pet moose lives on, even though the moose did not. His ignominious death is almost common knowledge. Even as far as his astronomical work is concerned, outside of the scientific community, he is perhaps best-known for his geoheliocentric universe, which was later so strongly disproven by his own assistant.
In his short story “The Use of Force,” Williams Carlos Williams puts a bad taste in your mouth about how the doctor acts towards the little girl known as Mathilda. He actively grasps her jaw, holds her down, and ends up making her mouth bleed. When people read this story for the first time, they could see the doctor as a cruel person who does not care for the well-being of children, or even that he does not like children and wants to hurt them. However, I believe that the doctor is justified in his actions of force and should be commended for his successful diagnosis.
...of mechanics. By that time he was an old man, and was blind. He died in 1642, the same year Isaac Newton was born.
The lumps on the one surface move against the lumps on the other surface and produce the force of friction. I predict that in this experiment if you double the weight the friction on the object will also double. I have based this prediction on the formula shown below. [IMAGE] = [IMAGE] Frictional Force [IMAGE] Normal Force (Fn) This formula shows that the force of friction is proportional to the original force/ weight of the object.
In the experiment these materials were used in the following ways. A piece of Veneer wood was used as the surface to pull the object over. Placed on top of this was a rectangular wood block weighing 0.148-kg (1.45 N/ 9.80 m/s/s). A string was attached to the wood block and then a loop was made at the end of the string so a Newton scale could be attached to determine the force. The block was placed on the Veneer and drug for about 0.6 m at a constant speed to determine the force needed to pull the block at a constant speed. The force was read off of the Newton scale, this was difficult because the scale was in motion pulling the object. To increase the mass weights were placed on the top of the ...
He is also known for advancing the science of fingerprints. In 1910 he was authorized to start a small forensic laboratory in the Palais de Justice which he directed until 1951.While there he worked on criminal identification methods including poroscopy- the microscopic examination of fingerprints; analyses of body fluids, hair and skin; and graphometry or handwriting analysis. He is the man responsible for coming up with the theory that when two objects come in contact with each other they leave some kind of material matter behind. This theory was later called Locard’s Exchange Principle. The idea is that the evidence can be used to associate objects, individuals or locations with one another." A person typically loses about 100 hairs a day.
The acceleration of a body or object is directly proportional to the net force acting on the body or object and is inversely
He was one of the first who created the "looker" (now called telescope) by placing two pieces of lenses together. The discovery that placing lenses together can magnify images was made by children who took Lippershey's spectacles and looked at a distant church tower. One of the most influential scientists associated with the telescope has to be Galileo. He took the design and reinvented the telescope into one of the first refractive telescopes we use to this day. Galileo used this great invention to report astronomical facts such as the moon is covered with craters instead of being smooth, the Milky Way is composed of millions of stars, and Jupiter has four moons.
Sir Isaac Newton is the man well known for his discoveries around the term, Motion. He came up with three basic ideas, called Newton’s three laws of motion.
In the natural world, physicists find new discoveries constantly. Some of these discoveries include the study of motion and forces. The well-known scientist, Isaac Newton, came up with the three laws of motion, which state rules and facts about the movement of an object. Our textbook states the laws of motion, as ?A body in motion will remain in motion at a constant speed and direction unless an outside force acts upon it. The net force acting upon an object is directly related to the mass and acceleration of the object resulting acceleration is in the direction of the net force, which is the vector sum of all forces acting upon the object. Finally, the third law of motion states that when one object applies a force to another, the other object applies the same amount of force back to the first object, but in opposite directions.? With these laws of motion, we can understand in detail how our world works. Also, that the movement of an object is more complex than a simple push. This discovery is taught to students all over the world because of its great importance and will continue to enhance the knowledge of the mystery of our earth.