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===About Stopwatch===
: A '''stopwatch''' can measure the [[time]] taken tell how long it takes for something to happen, but it doesn't tell the [[time]] of day.
===Examples===
==Key Stage 2==
===Meaning===
A '''stopwatch''', usually called a '''stopwatch''', is a [[Scientific Instrument|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==
==Key Stage 4==
===Meaning===
A '''stopwatch''' is a [[Measuring Instrument|measuring instrument]] used to [[measure]] how much [[time]] it takes for something to happen.
: 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 '']