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Revision Notes Interval of time is measured using clocks or a stopwatch SI unit for time is the second(s) To find the amount of time it takes a pendulum to makea spin, time ~25 circles and then divide by the samenumber as the number of circles. Videos Click edit button to change this text. Lorem … Read more

How to use? Rotate the thimble until the wire is firmly held between the anvil and the spindle. To take a reading, first, look at the main scale. This has a linear scale reading on it. The long lines are every millimetre the shorter ones denote half a millimetre in between. Then look at the … Read more

Length A metre rule (ruler) is used to measure length for distances between 1 mm and 1 meter. The SI unit for length is the meter (m). Precaution to be taken when using metre rule Make sure that the object is in contact with the ruler. Avoid parallax error. Avoid zero error and end error. … Read more

Base Quantities Physical quantities are quantities that can be measure. Each physical quantity contains information on its numerical magnitude and unit of measurement. Physical quantities can be classified into two types, the base quantities the derived quantities Base quantities are quantities that cannot be defined in terms of other base quantities. A base unit is … Read more