Classical Physics

you have a bolt. you have two wrenches. one short. one double the length of the short one. when you use the longer wrench, you're applying double the force on the bolt than when using the shorter wrench. my quiz was, where did the excessive force come from? didn't you apply the same amount of force? so how come? my answer was: no force is created, none is added.. the force per unit angle density is higher.. meaning, it's not the force that's doubled.. it's the angle which the force is acting on that's been halfed.. the force is the same, you double the lever---> you halfen the angle under said force. that's the logic behind momentum and torque e…

I just posted a new water rocket video on YouTube today, only 5 minutes long. It is mainly about the problems I have tried to solve in increasing reliablity over the last year. Bill Kuhl

Formula is an educative program created by me to help in assignment and other educational purpose that may require calculation. Formula was mainly created for physics calculation but can also be use in other calculative areas. Formula can calculate any number of unknown variable, showing you all the workings, step by step till the final answer. http://www.datafilehost.com/download-f2a25243.html

here is a simple diagram, one could use to explain the difference between distance and displacement. Four points ABCD forming a square. And something moving along the path AB, BC, CD, DA. After the round, distance of travel is the sum of distances, displacement is null. Elementary. But because we are talking about motion, or displacement, and because we know that we need time to travel, let's introduce Time. We are obtaining something like this: That may look a little bit more complicated, but it is only a developpement of the previous diagram. Now we see clearly the difference between distance & displacement. Is that clear to you? Really, where i…

When the temperature is very cold I often hear people say that the pavements are "like glass" meaning that they are very slippery. Does glass and rubber (soles of shoes) make for a slippery situation when it comes to walking? I would have though rubber on glass produces a fair amount of friction.

I saw a graph in a book on Chaos theory and it showed in the first third of the graph, lines moving horizontally; then there was a break in the second third where the lines disappeared; then in the third part of the graph, the lines reappeared. Can you tell me what this is called; even better, can you show me a picture of it; even better, can you tell me more about it? Does this have anything to do with the glycerine/ink experiment where the ink disappears in the glycerine and then when turned the other way, it reappears again? Thank you.

This program is a free 2D visual physics program that allows for a variety of interactions. Here's the download link: http://www.phunland.com/wiki/Download The program can simulate an environment with or without gravity. with or without air. Objects can have varied friction, bounce, and even their own gravitation attraction (if you set the program menu to advanced mode). Also, you can have keyboard control of an object with the arrow keys. It is advisable to have a decent computer with a decent video card to run this program smoothly. I had this program for quite sometime, a buddy told me about it and ever since I've been goofing off with it on occasion. W…

Is the phrase "accelerating the speed" (of something) a contradiction? Thanks

I hear that main power lines only have limited power going through them to avoid the lines sagging too much. Is the sagging of the power lines just due to the heat and/or something else?

Apparently the fastest an object has ever been made to spin is only 23 million rpm. What is preventing us from making things spin faster, and maybe even approach the speed of light? If an object is magnetically suspended in a vacuum, I see no limiting factor. The only objects ever made to approach the speed of light have just been subatomic particles spun around a circular circuit of tube. When spinning an object with significant mass, however, the circuit of tube poses a huge limit to speeds attainable because the object's centrifugal force would be to great to hold in, but if it is spinning stationary, I see no limit to how fast electromagnets could accelerate it.

An electric motor spins a disc with magnets attached. Takes say 10 Watts. Magnets are placed fixed near the disc. The motor exerts extra effort to overcome the magnets that try to brake the disc motion. Motor takes now say 20 Watts to run overcoming the magnetic braking effect. Do the magnets warm up? If it was a free running drill using 10 Watts, comparing to 20 Watts when actually drilling, are the extra 10 Watts shown as heat at the drilling friction action (bit, part drilled) ?

Which one demands more force to spin if held submerged in mercury; a magnet or a plain iron piece ? -Being both equal shape, size, speed, depth...

so my "professional" high school physics teacher began our intro with electricity by telling us to do notes...and failed to answer basic physics questions so here is the product of my curiosity It states that, electricity is produced by the electron transfer between objects in a basic sense. My question is...where do these electrons come from? i mean...sure it says atoms, but like..don't atoms hold their electrons tightly? this is the entire basis of chemistry that electron transfers between atoms influence reactions.. so in a way...when, for example friction, we rub things to produce a charge, we separate atoms and electrons. Doesn't this degenerate the substance due…

if the pendulum is kept vertical & the earth rotates the direction of swing of bob is not influenced by the roattion of earth. so the angle the earth rotates in time t should be same as traversed by the pendulum in same time t. why then omega/sin(of latitude) is the time period of oscillation? can anybody please expalin me that cosidering an inertial reference frame? pls reply.

Here is a little representation including basic instances : Mass, Velocity and Time. Mass is the vertical axis. Time is horizontal (front) Velocity is horizontal (back) Distance is the product of Time with Velocity, i.e. the grey surface. The yellow surface is Momentum. The entire cube has units of mass times distance (kg m), something like torque (or work). What is the last surface standing for (the one with the red diagonals)? its value is Mass times Time. What is MT? ??Something like a "momentum in time"??(the power residing in an object moving through time?)

I'm a Junior high school student and we have this investigatory project in our school. Ours is about spider silk, and our main problem is how to measure the elongation limit and breaking point of spider silk. I found this study made way back in 1976 [http://biomimetic.pbworks.com/f/THE+PHYSICAL+PROPERTIES+OF+SPIDER'SDENNY.pdf]. The author made a crude machine to measure these characteristics, but I think there is no way we students could afford an LVDT or capstan or whatnot. Does anyone know how to make a crude version of this machine, or any different method to measure the elongation limit and breaking point? Thank you very much! Merged post follows: Consecutive post…

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The artificial gravity from the fiction book/movie 2001 created by spinning the whole spaceship; would that be somehow feasible ? What technical hurdles keep it in the fiction domain ?

I found this on a web page and it makes no since to me. if I have a ball and I spin it on the floor, the entire ball is spinning at the same rate of speed. Top Middle an Bottom, still spins the same. How then can the earth spin at different speeds depending on where you are on the planet? "How fast does the earth spin? That depends on where on Earth you are standing. At the poles, the Earth hardly spins at all, but as you travel towards the equator, the rotational speed picks up. This makes sense -- as the circumference of a circle increases, a single point along it has to travel faster to complete a revolution in the same amount of time. The rotational spe…

I was just thinking about the curving bullet episode on mythbusters, when I thought about the possibility of making a ram jet bullet, using a phosphorous coated magnesium core, or something like that. The friction of air passing through would ignite the phosphorous, and that would ignite the magnesium. If this ram jet bullet were to eject the exhaust at an angle, do you think it could be a working curving bullet? Obviously the curve wouldn't be as extreme as the ones in the movie. I'm also curious as to if a ram jet bullet (non curving) could have a place in the military or in sporting. Perhaps long range sniping or reduced recoil?

We need a new source of energy, one that can provide limitless quantities of energy, but without polluting the environment. Solar and wind power are prime candidates, since the energy is renewed naturally and frequently. However, we don't know how to create energy from these sources sufficient to power the whole world yet. Or do we? Do you think it's probable (not just possible, but probable) that some energy companies, like Exxon Mobile, already have a formula for the perfect energy source, yet keep it a secret for the time being, enforcing this secret with impenetrable security and rigorous non-disclosure contracts? Think about it: Energy prices are at an…

okay first off hi this is my first post I came here bcause I intend to make a new type of generator that no one has ever built and I have some questions that would be very usefull to know befor we start trying to make it most of the stuff is easy to test but we currently have no matterials to do so. I geuss my first qeustion is if you have a weak magnet and a stronger magnet the weak magnet gose torwards the stronger one however if the weak magnet is made to be immobal will the stronger magnet move torwards it? I know this is a stupid question and probably the answer is yes but still I would like to check befor hand and make sure. Also it may change the answer that the w…

kind of related to the idea of the generator im building but i may have came up with a new theory on motion okay from what I can tell perpetuall motion is the idea something will stay at the same pace and will keep going forever, of course this idea is crushed by the real life physics of gravity and friction my idea is befor the speed of an object hits zero it is applied more speed so that it constantly is moving just not at a constant speed can anyone tell me of any errors i have on this so i know or if anyone already had this idea so i know gonna calll this perpettual propulsion for the moment because the idea is the fact its slowing down that speeds it up,…

I have a simple question, if I were to use a cylindrical NdFeB magnet and coil it in a plastic coated copper wire, would it amplify it's magnetism? (such as in iron or nickel.) Furthermore, if I were to get ahold of liquid nitrogen, would this "contraption" super-conduct? I am very interested in learning how electromagnetism works, and wish to go further than coiling iron nails.

Gravity pulls on an object, which speeds up thus gaining kinetic energy. Like-charged particles repel, which seems to be a method of energy production. What am I missing?