physicsDefinition from Wiktionary, the free dictionary Jump to: navigation, searchFrom Wiktionary under the GNU Free Documentation License. Physics (Ancient Greek: φύσις physis "nature") is a natural science that involves the study of matter and its motion through space-time, as well as all applicable concepts, including energy and force. More broadly, it is the general analysis of nature, conducted in order to understand how the universe behaves. Physics is one of the oldest academic disciplines, perhaps the oldest through its inclusion of astronomy. Over the last two millennia, physics had been considered synonymous with philosophy, chemistry, and certain branches of mathematics and biology, but during the Scientific Revolution in the 16th century, it emerged to become a unique modern science in its own right. However, in some subject areas such as in mathematical physics and quantum chemistry, the boundaries of physics remain difficult to distinguish. Physics is both significant and influential, in part because advances in its understanding have often translated into new technologies, but also because new ideas in physics often resonate with other sciences, mathematics, and philosophy. For example, advances in the understanding of electromagnetism or nuclear physics led directly to the development of new products which have dramatically transformed modern-day society, such as television, computers, domestic appliances, and nuclear weapons; advances in thermodynamics led to the development of motorized transport; and advances in mechanics inspired the development of calculus. From Wikipedia under the
GNU Free Documentation License PHySICS!!!!? Q. A particular horizontal turntable can be modeled as a uniform disk with a mass of 200 g and a radius of 20 cm that rotates without friction about a vertical axis passing through its center. The initial angular speed of the turntable is 2.4 rad/s. A ball of clay, with a mass of 80 g, is dropped from a height of 35 cm above the turntable. It hits the turntable at a distance of 10 cm from the center, and sticks where it hits so that the clay and the turntable rotate together at a new angular speed. Assuming the turntable is firmly supported by its axle so it remains horizontal at all times, find the final angular speed of the turntable-clay system. please explain how to do it!! Asked by yep - Mon Nov 26 16:15:04 2007 - - 2 Answers - 0 Comments A. This is a conservation of angular momentum question. Wbefore = angular speed before clay Wafter = angular speed after clay Jbefore = angular momentum before clay Jafter = angular momentum after clay Id = moment of inertia of disc Ic = moment of inertia of clay Rd = radius of disc Rc = radius of disc Md = mass of disc Mc = mass of clay Assuming no frictional losses anywhere in the system and a point mass of clay: Id = (1/2)(Md)(Rd)^2 (from definition of moment of intertia of a solid disc) Id = (1/2)(0.2 kg)(0.2 mt)^2 (converting to kilograms and meters because I can't think in any other units) Id = 0.004 kg-mt^2 Ic = (Mc)(Rc)^2 (from definition of moment of inertia of a point mass about a center point) Ic = (0.08 kg)(0.10 mt)^2 Ic = [cont.] Answered by FJSL - Mon Nov 26 19:05:06 2007 How does knowing physics help in fighting? Q. I read that many top fighters in numerous fighting sports especially in grappling sports such as Judo and Sambo state that knowledge of physics(and its formulas) will be very helpful in planning strategies and tactic in matches.They also said knowing laws of physics help you execute techniques more easiluiy.How does knowledge of physics help them? Asked by Patrick S - Tue Mar 23 11:55:23 2010 - - 3 Answers - 0 Comments A. The body is made of physical objects. Therefore, physics can be used to model the body. Therefore, you can use physics to understand how to use a body in the best way possible. Simple ideas such as leverage and inertia can help make predictions on how you and your body will move if punched, and what limits to your capabilities are. More complex ideas could also help - the body is essentially a bag of water, so fluid dynamics, along with physiology (biology about structure), can help figure out exactly where punches would have the most effect. Fighting, in essence, is two Newtonian machines moving against each other. If you know how a machine works, you can make it move like you want. It's the difference between using a sword like a club… [cont.] Answered by Philip W - Tue Mar 23 12:03:43 2010 What way can making videos require physics? Or any ideas in talking about an experiment that requires physics?
Q. We need to find something that is done or deals with physics and explain it. I need ideas, and I love making videos so I wonder if maybe video making deals with physics. Any ideas? Doesn't have to deal with video making, just ideas. Asked by Jonie - Fri Aug 28 11:50:07 2009 - - 2 Answers - 1 Comments A. You can video some dynamical process like gyroscopic motion of a spinning bicycle wheel suspended on a rope or the parabolic trajectory of a ball. Use the video to quantify it's motion with frame grabbing software and show it obeys classical mechanics. Answered by Dr. R - Fri Aug 28 12:07:45 2009 From Yahoo Answer Search: "physics" Physics is the science of the natural world, which deals with the fundamental particles the universe is made of, the interactions between them, and the interactions of objects composed of them (nuclei, atoms, molecules, etc). ContentsSourced
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