Why is a laser mouse so much better than a roller mouse?
145227
Because laser guidance is extremely precise, unlike the rollers, which tend to get very dusty and cause malfunctions.
1155196
Some of the advantages are that a CNC (Computer Numerical Code [a computer controlled variant]) Mill can give incredibly accurate machined surfaces, edges and bolt patterns, and can reproduce that exact piece over and over, with barely a noticeable difference in one piece over another. Most differences come from irregularities in the stock or casting you want to machine. Mills can cut gears, ream key-ways or bore holes, make manifolds ... it goes on and on. There are different kinds of mills; there are the manually operated ones that take much care in setup and production of each piece, to single head mills with a battery of tools to do multiple operations, but only in one axis, to multi head, multi angle mills, which are like a legion on gnomes attacking a piece of metal, doing multiple operations at once, from shaping (all Mills can do this) one surface while another head is drilling and tapping holes, and yet a third is boring on another axis. The main disadvateges are that most mills in my experience are not very good at machineing round or spherical stock to a round or sphereical finished product, you use lathes for that. Another is the size, even a small mill can require about 3 meters square for setup and auxilliary equipment. Another drawback is the cost. These things aren't cheap and they use lots of electricity.
26793
let me translate for you what i think the first answer is suposed to say\n\nyes a rollercoaster decellerates more on a sharp turn than on a rounded turn.\n\nI agree with this because the more drascic change of angular momentum requires more energy and offers more friction this always within the known laws of physics results in energy loss.  in this case loss of kinetic energy
56704
Inside the USB adapter/mouse port that controls your mouse is a reciever.  Inside your mouse is a transmitter. When the optical laser/ball moves, it sends a signal to move the mouse a certain direction to the reciever.  Once the reciever gets the signals, (which is about a S P L I T second,), It moves the cursor on the screen.\n\nP.S. When you try to move the (OPTICAL) mouse on glass or plexiglass, a little camera which recieves the movement, will not pick up.
38143
If you mean optical, I use one.  They are much better than the old roller-ball mice and much lighter weight too.  I suggest investing in one, they really do make life easier (instead of trying to clean those little white wheels almost constantly!)
144425
as an opertator of a CNC laser... I can tell you this. Robotics are totally necessary for a business to compete. I make the coolest parts in a blink of an eye.
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There is another reason.\n\nOnce this convention was set up, video game makers brought out optical sensing guns / pointers that would make use of this scanning feature to determine where the gun was pointed when the trigger is fired.\n\nBasically, these devices blank out the screen when the trigger is depressed, and start a counter. Since the screen has to be refressed from L to R and then the next row and so on, it can determine the time required for the screen to blank to the position it is aimed at. The controller then determines the position by interpolating the time.\n\nSince no one wants to break these devices by choosing any other convention, it stuck.\n\nThere may be reasons why it was chosen in the first place. The ray is actually moved by magnetic fields, and usually a ramp is used to generate this field. Therefore once it has moved to the right, the ramp is reset and the motion resumes from the left.
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Rolling an object takes less effort than carrying or dragging it.\nIf you carry the object then you have to pick up its entire weight, this makes it difficult to carry.\nIf you drag the object then a part of the object's weight is supported by the ground, this makes it easier to carry.\nBut it is better to roll an object instead of dragging it.\nWhen objects are dragged, extra effort is required to overcome friction but when objects are rolled, friction helps in rolling the body, thus the least effort is required in rolling something.
151244
The belt sander is faster and better, so long as you don't sand against the grain of the wood.  Orbital sanders are slower, and can leave visible swirls or circles because their motion necessarily cuts across the grain.
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http://computer.howstuffworks.com/mouse.htm
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I have used the kenisgnton orbit elite mouse. My fingers were sore befoire I used this, cleared immediatly. The main reason is that it makes you use the outside of you thumb and pinkey without bending them. Also no middle button with often the root of the problem.
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I like it, but I like it for a number of specific reasons:\n\n1) It's porable enough to fit into my laptop bag.\n2) I can use it for rough compositing. (I'm a filmmaker / producer / director, so for me to be able to do things on location - even if it's just a quick diagram, or something is a *BIG* deal!)\n3) It works well, it's quick, and its easy to use.\n\nBAD POINTS:\n\nThe pen just isn't heavy enough. It feels like you're writing with a drinking straw (even WITH the battery installed.)\n\nIf you're doing graphical art with it, you might opt for something different. Like I said - for me, it's quick and easy, down and dirty.\n\nProfessionally, I *LOVE* my 18" Kurta - no longer made - sorry! :S It has a heavy pen, and it tracks nicely.\n\nAgain, I'm not using it for the cordless mouse, and for other purposes (other than graphic arts,) I use the specific tool for the job (ie: for me, editing something, I'll use a physical jog-shuttle wheel instead of the pen on the jog-shuttle control on the screen, though I have in a pinch - it wasn't that great.)\n\nSorry I couldn't give you any more of an answer, but I hope that helped!
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My answer is somewhat silly.\n\nI think that is friction between the rope and your hands. If there was low friction, the rope would slide out, or you would have to hold it very very tightly, and this would increase the effort.\n\nAs between the pulley and the rope, there is very little friction and exactly this reduces the effort. If the friction was high (e.g. if the pulley was stuck), the required effort would have been higher.\n\nIf you're interested in how the wheel reduces friction, it is simple. Say you need to pull something by many meters. If there was no wheel, you would have many meters of high friction movement. If you have a wheel with a circumference of 1m, and its axis has a circumference of 1cm, then for each rotation of the wheel (1m) only the axis slides against the wheel by 1cm. The slide distance is 100 times lower. That's even not accounting for sleeve bearings (reducing friction of the axis). Or, even better, ball bearings.
8707
If your mouse has a ball, make sure you clean the ball and the rollers inside the mouse case.  They tend to pick up a lot of dust.\n\nBetter yet, get an optical mouse, they don't have the dust problems due to no moving parts.
151138
There are two versions of the mouse:\n\n* The tracking ball based - This consists of a ball enclosed in a housing, the walls of which have wheels that rotote in accordance to the wheel brushing against it (much like gears in motion). The wheel is in contact with the surface of motion, and rotates according to the way we move the mouse. The motion of the wheels is encoded digitally and sent to the CPU.\n\n* The optical mouse - this consists something like a camera on the bottom side, which is illumiated. The camera takes quick snapshots of the surface on which it is placed, and processes the information from consecutive such frames to determine motion, if any, and how much.
164413
Disc brakes are much more effective and tend to lasst longer.  The only disadvantage is they are more expensive.
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I consider Firefox to be better than IE for several reasons.\n\nIn terms of usability, the biggest advantage of Firefox over IE, I think, is that is uses tabs, which saves alot of space in my task bar cause I tend to have many pages open at the same time.\n\nAlso it has extensions so you can get it to do pretty much anything you want like mouse guestures and ad blocking. Check out https://addons.mozilla.org/extensions.php to see more. Plus if you don't want any of these extensions then you can just use it as it is (why do some people here seem to think that isn't simple?).\n\nFirefox also has an excellent built-in popup blocker\n\nOf course, it is also alot safer than IE. I only use firefox and I haven't gotten any spyware yet (although I still check everynow and then just to make sure).