Basic elements of physical science

Linear motion is part of grade 10 physics, focusing on the Mechanics or study of movements

There is an international system of units called the SI units (système International d’unités) which is most commonly used around the world and by scientists since 1968.
Measurable features or properties of objects are often called physical quantities. All physical quantities should be quoted with their numerical value and their unit.
Base quantities or fundamental quantities are those which are used to define all other quantities (or derived quantities)
When dealing with very large or small number, express them in powers of ten known as “scientific notation or standard form”: M×〖10〗^n, where M is a number having a single non-zero digit to the left of the decimal point and n is a positive or negative exponent.
Significant figures are those digits in a number that are known with certainty plus the first digit that is uncertain.
Length is defined as a linear measurement of the distance between two points. Its SI unit is called the metre. Instruments used to measure length include the ruler, the engineer’s callipers, the micrometer screw gauge and the vernier callipers.
Time is the measure of how long an event lasts and is measured in seconds. The measuring instruments of time include clocks and the pendulum.
The time taken for the pendulum to oscillate once is the period (T) and is calculated from T=(Total time)/(number of oscillations) or t/n or T=2π√(l/g) and the number of oscillations made in one second is called its frequency and is measured in Hz; f=1/T or n/t

• The système International d’Unités’ (International System of units) shortened to S.I. units is the metric system recommended at The conférence Générale des Poids et des Mesures (CGPM)’ (General Conference on Weight and Measures) as standard for use in any scientific measurements.
• The SI Units uses seven base units from which all other units are derived from by multiplying or dividing one unit by another without introducing a numerical factor.
• The SI base units are: Length, Mass, Time, Electric current, Thermodynamic temperature, Luminous intensity and Amount of substance
• A system of prefixes has been created to simplify the expression of the physical values written in standard form.
• The physical values written in the scientific notation or standard form are expressed in powers of ten in a way to assess the order of magnitude and to visually decrease the zeros that are got in the answer to some problems.
• Accuracy is how close the value is to the actual value (remember A and a).
• Precision is how close values are in an experiment to each other. Precision is dependent on the significant digits of the instrument or measurement.
• If a number is very large or has infinite number of digits, then this number is made simpler by only referring to a specified number of digits.