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In everyday use and in kinematics, the speed (commonly referred to as v) of an object is the magnitude of the rate of change of its position with time or the magnitude of the change of its position per unit of time; it is thus a scalar quantity. The average speed of an object in an interval of time is the distance travelled by the object divided by the duration of the interval; the instantaneous speed is the limit of the average speed as the duration of the time interval approaches zero.
Speed has the dimensions of distance divided by time. The SI unit of speed is the metre per second (m/s), but the most common unit of speed in everyday usage is the kilometre per hour (km/h) or, in the US and the UK, miles per hour (mph). For air and marine travel the knot is commonly used.
The fastest possible speed at which energy or information can travel, according to special relativity, is the speed of light in a vacuum c = 299792458 metres per second (approximately 1079000000 km/h or 671000000 mph). Matter cannot quite reach the speed of light, as this would require an infinite amount of energy. In relativity physics, the concept of rapidity replaces the classical idea of speed.

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  1. U

    Slow bath cold feed, airlock or something else?

    Hey, i'm trying to get the bath in before tilers turn up, but the cold tap on the old bath was running really slow. I've since connected a flexi tap connector to the pipe to test and it is running pretty slow, i mean its not coming out like it does the taps in our other bathroom. I have drained...
  2. L

    Sink Trap leak and slow drainage

    Hi all I dismantled the kitchen sink plumbing and cleaned the pipes to improve the slow drainage. However, after I connected the pipes back together and ran the tap for say 20 secs water started to leak from the top of the sink trap connections as circled in the photo. I've added ptfe tape...
  3. hammers4spanner

    Slow customer

    I installed a boiler about 8 weeks ago for a woman that has become a pain , at the time of pricing i dealt with her father . However now the boiler is in use the his daughter who lives their is a bit slow and is becoming a pain . I have been back on three occasions due to something not working...
  4. T

    Cannot stop slow leak...

    Hi there, I'm trying to finishing plumbing in a shower valve but there's one fitting that I just cannot seem to get to stop leaking (albeit very slowly...two single drops in 24 hours). I've changed fittings three times, I first used PTFE tape and now jointing compound but still can't get it to...
  5. M

    Slow filling toilet

    Hi everyone I have a toilet that when flushed is very slow to fill. I've attached images to show what inside cistern is like. Would really appreciate advice. Thanks
  6. R

    Kitchen sink - slow draining

    So I've posted before about blocked sinks I've failed to unblock Well, what do you think of this, today had a very slow draining sink Thought, here I go again!! I noticed that the waste was loose, so I tightened the screw fitting which joins the waste to the plastic underside. Low & behold...
  7. C

    Slow filling cistern - Armitage Shank

    The cistern is filling very slowly, just a trickle. I have looked at various videos and read tips on how to clean the valve from debris but cannot take this one apart!
  8. U

    Washing Machine Drains slow + Noise

    Hello, As of recent, we have been unable to use our washing machine. The kitchen sink is located approximately 3m from the washing machine drain which is housed in a separate utility cupboard. The sink was recently blocked, however we were able to clear the blockage with a drain cleaning...
  9. S

    Slow leak

    Hi All, I'm having a major panic about a leak on the HW side of my CH system. We recently had some work carried out by a plumber to replace the pressure reducing valve and pressure relief valve on the cold water feed to the HW system. Over the weekend I noticed a wet patch appear on my...
  10. T

    Very slow hot supply

    Hi I have taken over a job where a total incompetent fool was playing plumber but clearly did not have a clue. Has destroyed the poor home owners gaff, started at just a leaking Johnson fitting (back to front) the catalog of mess is endless. The pipe work he done looked like mario had been at...
  11. C

    Very slow movement on water meter but no leak found

    Hello I am hoping for some advice please. I have recently noticed that my stop tap under the kitchen sink is really tight, so to check we can isolate the supply in an emergency I turned off the stop tap in the road - all OK. However, when turning it back on I noticed the 0.0001 dial is...
  12. U

    Very slow water meter movement no leak to be found

    Hi All I am hoping you can give me a bit of advice. I recently noticed my stop tap is very tight, so I tested the tap out in the road. All ok and stopped water supply. However I noticed the 0.0001 dial was moving every so slowly when tap was back on, I guess many would have missed it. I have...
    • Unregistered
    • Thread
    • found isolate leak meter movement slow slowly water water meter
    • Replies: 0
    • Forum: Plumbing Jobs | The Job-board
  13. L

    Slow flushing toilet

    Got called out on a job today of a blocked toilet. Arrived at a block of flats (3 story high)and saw that a ground floor toilet would flush and very slowly drain. Went outside and started lifting manholes, all looked clear but couldn't find where the stack branch line was. Had the customer run...
  14. D

    Kitchen Sink Slow to Drain

    Hey everyone, My wife and I moved into our house about a year and a half ago and the kitchen sink has always been quite slow to drain. We believe it's because the waste pipe dips to give a slight uphill for the exiting water. The drain hole is quite high up on the wall for some reason...
  15. S

    Very slow draining bath

    My bath has suddenly started to drain very slowly. I have taken out all the waste water pipes under the bath and cleaned them out. I have also snaked down 5m away from the bath but the problem persists. When all the pipes are drained and cleared if I add around 100ml of water this backs up...
  16. J

    Slow starting shower pump solution !

    Came across this problem last week, thought I would share it in case it saves someone an hour of piddling about! Fitted a new Mira bar mixer shower in place of old Triton. Runs off an existing Salamander pump fitted in loft. Dubious whether enough head but been working fine for 4 years, so what...
  17. S

    Slow hot water flow presurised system

    Hi all, we've moved into our new house and the hot taps have had a very slow flow since we've been here. We have a presurised system and i found this knob https://docs.google.com/file/d/0BwL5BzqmCJ00VW43WkZSN09Wekk/edit?usp=docslist_api (don't know what its for!!) well, ive turned this blue...
  18. H

    Slow, dripping water filling water tank in loft... Please see below:

    Hi Guys, I'm experiencing a bit of an issue here: When turning the taps on for hot water, there isn't any current / flow of water coming in and I don't know why. It felt as if something / someone turned the tap off. As a result, this has effected the kitchen, washing machine, dish washer...
    • hasa
    • Thread
    • below different dripping filling heating loft please recently slow tank water water tank
    • Replies: 2
    • Forum: Plumbing Jobs | The Job-board
  19. W

    Very SLOW to thermostat!

    By slow I mean a digital thermostat, (fitted by a CORGI gas engineer who put our new gas boiler), which takes ages to move up or down a degree, by which time the house is either too hot or too cold. I presume it was put in a decent spot! It is on an inside wall in the centre of the house...
  20. B

    Shower waste - water very slow to drain

    Hi, water from my shower tray has started to drain very slowly, I investigated the drain but can't work out how the water escapes, there is no outlet hole in the bottom part of the drain that threads onto the top part of the drain (hope that makes sense, I am perplexed as to how the water has...
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