#REDIRECT ==Key Stage 1=====Meaning===[[TimerFile:Stopwatch.png|right|300px|thumb|A picture of a [[stopwatch]].]]A '''stopwatch''' is a piece of [[equipment]] used to find out how long something takes to happen. : Singular [[Noun]]: '''Stopwatch''': Plural [[Noun]]: '''Stopwatches''' ===About Stopwatch===: A '''stopwatch''' can tell how long it takes for something to happen, but it doesn't tell the [[time]] of day. ===Examples===: A chef made sure the eggs were only boiled for 5 minutes.: A scientist measured how long it takes to count to 100.: A scientist wanted to see who could get to the other side of the field in the least time. ===Used in a sentence===: A scientist used a '''stopwatch''' to time how long it took to count to 100.: A scientist used a '''stopwatch''' to measure how long it took each person to run across the field. ==Key Stage 2=====Meaning===A '''stopwatch''', usually called a '''stopwatch''', is a scientific instrument used to [[measure]] how much time it takes for something to happen.===About Stopwatch===: A '''stopwatch''' can [[measure]] the [[time]] taken for something to happen, but it doesn't tell the [[time]] of day. ==Key Stage 3=====Meaning===[[File:Stopwatch2.png|right|300px|thumb|A picture of a '''stopwatch'''.]]A '''stopwatch''' is a [[Measuring Instrument|measuring instrument]] used to [[measure]] how much [[time]] it takes for something to happen. ===About Stopwatches===: A '''stopwatch''' can usually give a [[time]] to an [[accuracy]] of to 10 milliseconds.: Most '''stopwatches''' have a 'lap' function that will keep the timer going in the background while the [[time]] that the 'lap' button was pressed will stay on screen until it is pressed again.: '''Stopwatches''' are subject to [[Human Error|human error]] because [[human]]s cannot always react instantly to an event. Any time recorded is probably longer than the real time because it took time for the [[human]] to react. ==Key Stage 4=====Meaning===A '''stopwatch''' is a [[Measuring Instrument|measuring instrument]] used to [[measure]] how much [[time]] it takes for something to happen. ===About Stopwatches===: A '''stopwatch''' can usually give a [[time]]to an [[accuracy]] of to 10 milliseconds.: Most '''stopwatches''' have a 'lap' function that will keep the timer going in the background while the [[time]] that the 'lap' button was pressed will stay on screen until it is pressed again.: '''Stopwatches''' are subject to [[Human Error|human error]] because [[human]]s cannot always react instantly to an event. Any time recorded is probably longer than the real time because it took time for the [[human]] to react. ===References=======AQA==== :[https://www.amazon.co.uk/gp/product/178294558X/ref=as_li_tl?ie=UTF8&camp=1634&creative=6738&creativeASIN=178294558X&linkCode=as2&tag=nrjc-21&linkId=f0dfb66dafcb0c6e9449e7b1a4ae1ac433 ''Stopwatches, page 104, GCSE Physics; The Revision Guide, CGP, AQA ''] ====OCR====:[https://www.amazon.co.uk/gp/product/1782945695/ref=as_li_tl?ie=UTF8&camp=1634&creative=6738&creativeASIN=1782945695&linkCode=as2&tag=nrjc-21&linkId=ceafcc80bcad6b6754ee97a0c7ceea53 ''Stopwatches, page 218, Gateway GCSE Combined Science; The Revision Guide, CGP, OCR '']