IX Physics Chapter 1 Summary

• Physics is the branch of science which deals with studies of matter its composition, properties, and interaction with energy.
• The branches of Physics are classified on the basis of different areas of study with different approaches.
• There are two types of physicist, theoretical and experimental physicist.
• Physics define mathematical relation between physical quantities. A physical quantity has magnitude and unit.
• Physical quantity are mainly classified into two categorize.
• Base or fundamental quantities
• Derived physical quantities
• Base quantities are length, mass, time, temperature, current, luminous intensity, and amount of substance.
• The standard of length is meter can be measured by measuring tape , or meter rule.
• The standard of mass is kilogram can be measured by physical balance.
• The standard of time is second can be measured by stop watch.
• The measured or calculated values either macroscopic or microscopic can be expressed in Scientific Notations.
• The volume of liquid is calculated or measured with help of measuring cylinder.