It usually takes extra torque to start loosening a tight bolt. But once a sticky bolt breaks loose, less?
968512
When a bolt is tightened, it stretches.\nThink of the thread as just two, long inclined planes in contact with each other. The tension in the bolt results in the two planes being pressed together, the harder you press, the greater the friction. As you undo the bolt, the tension is reduced, the pressure is reduced and so the friction is reduced.
1068932
To reduce strain on the electrical system when starting the motor (needs that initial "kick" to get it going and would overload most systems).
32662
actually the limiting friction is greater than kinetic friction.  it takes more force to overcome the forces of the limiting friction(start the object moving) then it does to overcome kinetic friction(keep the object moving). this makes sense logically, once the object is sliding, it's easier to keep it sliding then it is to start it moving in the first place...
197987
Just like when you crack your knuckles, its the gasses being released in the joint.  \n\nThe "cracking" won't cause arthritis unless if you continue to "crack" it (the vertebrae) out of line.  \n\nWhat's most likely happening is you have a vertebrae out of line and locked, it becomes uncomfortable or stiff.  In order to get the release, you crack the neck on your own. \n\n When it's not done right, by a professional, you end up cracking the wrong vertebrae (one that is loose because it's compensating for the locked one).  It eases the tension temporarily, but makes the problem worse in the long run.\n\nIf the locked vertebrae isn't aligned correctly, it will lead to arthritis (sort of like when your tires wear out when the car is out of alignment).  \n\nIt's not the cracking that's harmful, but cracking the wrong vertebrae or not aligning it correctly.  Only a professional with proper training will know how it needs to be corrected since the vertebrae can misalign many different ways.
319466
If your company is manufacturing a part and it consistently makes that part with a wide margin of variability, ie tolerances, then a problem could be created if that part had to mate with some other part. Perhaps holes wouldn't line up or perhaps a shaft wouldn't align properly with bearings it's inserted into.  Those parts then would likely fail early due to miss alignment, vibration, whatever.  Early failure translates into poor quality.  Tight tolerances make for for considerably better performance, long life,  or "quality".  Tight tolerances must be balanced though with cost. The tighter the tolerance the more the cost but the better the quality.  It's a balancing game depending on the application. Good luck.
244206
Stick-slip phenomena are a good source. Often stiction (the stopped friction force) is greater than moving friction. If a cart with stiction is pushed by a spring-connected object moving at constant speed, the result will be alternate stoping and moving. Brake squeal, creaking noises and tool chatter are all manifestations of stick-slip.\nEDIT:\nMachine tool chatter starts with stick-slip but rapidly increases in amplitude, bringing in tool and workpiece structural flexibility, and gouges made in the workpiece surface, as part of the dynamics. The process is not considered regenerative until the surface marks become a factor (ref.).
475882
Some handcuffs require some degree of inward pressure while turning the key to be released.  This makes them more difficult to pick.  If the cuffs were too tight to begin with, it is difficult to squeeze the cuffs any tighter to get them to release when using the key to take them off.
98142
Tightening the string (or making it shorter, or a smaller diameter).
472691
There should be a barrel adjuster on your rear derailleur near the cable anchor bolt. You can either increase or decrease the cable tension as necessary by turning it incrementally. \n\nIf your chain seems to want to shift past the cog that you're shifting to, then your cable tension is too high. If it's not quite making it to the cog, then your cable tension is too low.
376523
it depends on the angle of ur effort. lets say there u are trying to move a cart. if u push the way u will push ur mower, one component of ur force will be downwards, thus effectively pushing the cart down and thus increasing the frictional force . but if u pull the cart this force will not be downwards but upwards and hence the frictional force will be reduced. so its better to pull.
1103705
higher the mass, higher the momemtum, so more time n more force is required to stop it
404236
a Screw usually has threading, a Bolt usually doesn't. Actually, a Screw is shorter than a bolt.
1016759
one of the definitions of the word clutch  is a tight or critical situation.
208227
It means that for each 2 turns on one gear, there are 3 turns on the other (though I assume you know that already).  The efficiency is related to friction loss-the greater the ratio difference, the greater the force transer and thus friction loss, so the lowest ratio difference is the one with the least friction loss.\nThere is no change in distance from the fulcrum on a see-saw unless you are talking about the very small bending of the board, and that is likely too little to overcome other small forces, such as friction, movement of the people on the seat, etc.
151119
well it could...but not as much because there is less friction.
360589
on the gun theres the bolt you have to pull it back before you screw the tank in.
660075
The bolt lock represents a problem or person  in your life that you would like to get control of. All of your attempts to do so have been thwarted. When you caught it and grasped it tightly in your right hand, that was representative of your absolute detrmination to succeed despite the apparent difficulty involved.