Before you hire any famous tutor Singapore is famous for, you should learn and know some important Physics concepts such as measurement. In Physics, the theme of measurement mainly covers physical quantities and units, and apparatus that can be used to measure these quantities. Some of these measurements and apparatus may overlap with those found in Chemistry. Nonetheless, they are used for the same purposes.
In physical quantities and units, you will examine a set of base physical quantities and units that can be used to derive all other physical quantities. All physical quantities consist of a numerical magnitude and a unit. For example, 7 metres (m) is a physical quantity where 7 is the magnitude and metre (m) is the unit. The common base quantities are mass, length, time, current and temperature.
Mass is the amount of matter in a body. Its unit is kilogram (kg) and we can measure the mass of an object or person by using an electronic balance. Length is simply the measure or extent of an object from one end to the other. The unit of length is metre (m). Apparatus such as a metre rule, measuring tape, vernier calipers and micrometre screw gauge can be used to measure different types and accuracy of lengths.
Time is basically the measure of how fast it takes to complete a task. It is measured in seconds(s) although other units such as minutes (min) and hours(h) are sometimes used. A stopwatch can be used to measure time. Current is the measure of the amount of charge flowing through a circuit in one second. The unit of current is Ampere(A) and we normally measure current flowing in a circuit by using an ammeter.
Temperature is the measure of how hot or cold a substance is. Its unit is Kelvin (K) although other common units such as Degree Celsius is often used. A thermometer is often utilised to measure the temperature of a room or person.
The above mentioned physical quantities are called base quantities as they can be used to derive all other physical quantities. For example, the physical quantity speed, which has a unit of metre per second (m/s), is derived from the base quantities length (metre) and time (second). There are numerous other examples of such physical quantities that can be found in other topics in Physics.
Apart from recognising the base quantities and their respective units, we can also use prefixes to denote either very large or very small quantities of these units. Some of these prefixes include giga, mega, kilo, centi, milli, micro and nano. Giga, mega and kilo are prefixes which denote very large quantities while the other prefixes denote very small quantities. For example 7 kilometres denotes 7000 metres while 7 millimetres denotes only 0.007 metres.
Now that you are better aware of the physical quantities and units and apparatus that can be used to measure these quantities, there is no doubt that you will be able to understand the theme of measurements in Physics with greater ease. But if you still need assistance and tuition for more complex Physics concepts, then visit FamilyTutor.sg.