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Length - metre (m)
Time - second (s)
Mass - kilogram (kg)

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Mass is measured in kilograms (kg)
Weight is measured in newtons (N)

","mcqOptions":null},{"id":"39bf0592-988d-4f50-8244-80cfb8ed04b1","cardType":"basic","points":1,"front":"How should the number and unit be spaced in an SI measurement?","back":"Leave a space, for example 12 m.","mcqOptions":null},{"id":"6547a32d-5304-4cd7-af67-634f86f4c961","cardType":"basic","points":1,"front":"Should an SI unit symbol be pluralised for a value greater than one?","back":"No - write 8 kg, not 8 kgs.","mcqOptions":null},{"id":"0124b44f-bf89-4cfc-8650-e37f73b6f767","cardType":"cloze","points":null,"front":"SI unit symbols are [ ], so m means metre but M does not.","back":"SI unit symbols are case-sensitive, so m means metre but M does not.","mcqOptions":null},{"id":"2a76e1f1-8d12-4188-accf-659c82ba8c5e","cardType":"cloze","points":null,"front":"A derived quantity is formed by combining [ ] using multiplication or division.","back":"A derived quantity is formed by combining fundamental quantities using multiplication or division.","mcqOptions":null},{"id":"5ca00601-86e3-4e39-842d-43e0e9d59e62","cardType":"basic","points":2,"front":"How does dividing distance by time produce the SI unit of speed?","back":"$$\\text{m}\\rtimes\\text{s}^{-1}=\\boldsymbol{\\text{m s}^{-1}}$","mcqOptions":null},{"id":"719ad3a6-9561-48b9-9b5b-b219f9e99ca3","cardType":"basic","points":1,"front":"What is the SI unit of acceleration?","back":"$\\text{m s}^{-2}$","mcqOptions":null},{"id":"c7f5b0e0-28bb-4503-ac1d-0e31a766c504","cardType":"basic","points":1,"front":"Express one newton using the fundamental SI units.","back":"$1\\text{ N}=1\\text{ kg m s}^{-2}$","mcqOptions":null},{"id":"5eece00b-620e-49fb-a3cb-580817883e7a","cardType":"basic","points":2,"front":"A runner travels 1.2 km in 4 minutes. Find the average speed in SI units.","back":"$5\\text{ m s}^{-1}$","mcqOptions":null},{"id":"86824af2-280f-4d07-8458-614693ecbb51","cardType":"cloze","points":null,"front":"An equation is dimensionally consistent when quantities on both sides have [ ].","back":"An equation is dimensionally consistent when quantities on both sides have compatible units.","mcqOptions":null},{"id":"985224c2-5a9a-465a-9577-3e1c6c93f5c8","cardType":"basic","points":2,"front":"In $s=ut+\\frac{1}{2}at^2$, why can $ut$ represent a displacement?","back":"Its unit is metres: $\\text{m s}^{-1}\\times\\text{s}=\\text{m}$.","mcqOptions":null},{"id":"cd2b0ba8-f1df-4a8f-85b0-72240d45a76e","cardType":"basic","points":2,"front":"In $s=ut+\\frac{1}{2}at^2$, why can $at^2$ represent a displacement?","back":"Its unit is metres: $\\text{m s}^{-2}\\times\\text{s}^2=\\text{m}$.","mcqOptions":null},{"id":"c64c661e-94b1-4d44-9f9f-fee726e46f7f","cardType":"basic","points":2,"front":"What does an equation containing incompatible units prove?","back":"Something is wrong with the equation or its application.","mcqOptions":null},{"id":"05ce57e2-4257-4317-a009-7740f68a3742","cardType":"basic","points":2,"front":"Why does metres divided by minutes not directly give $\\text{m s}^{-1}$?","back":"The time must be converted to seconds before division.","mcqOptions":null},{"id":"653deb0b-163c-468c-8316-4b5679895ffa","cardType":"basic","points":2,"front":"Why does dimensional consistency not prove a calculation is correct?","back":"Compatible units can still accompany incorrect values or application.","mcqOptions":null}]}],"examCountdown":null,"heading":"2.1.1 Quantities and units in mechanics","title":"2.1.1 Quantities and units in mechanics Flashcards","topbar":{"backHref":"/a-level/maths/ccea/flashcards"},"topicSidebar":"$L38"}]}],"topicId":"fd95bdf1-321d-445d-ba8c-2031c12e696d","walled":"$L39"}],"$L3a","$L3b"]