Class 09 Science Properties of Fluids – Get here the Notes for Class 09 Science Properties of Fluids. Candidates who are ambitious to qualify the Class 09 with good score can check this article for Notes. This is possible only when you have the best CBSE Class 09 Science study material and a smart preparation plan. To assist you with that, we are here with notes. Hope these notes will helps you understand the important topics and remember the key points for exam point of view. Below we provided the Notes of Class 09 Science for topic Properties of Fluids.
- Class: 09th
- Subject: Science
- Topic: Properties of Fluids
- Resource: Notes
CBSE Notes Class 9 Science Properties of Fluids
Candidates who are pursuing in Class 09 are advised to revise the notes from this post. With the help of Notes, candidates can plan their Strategy for particular weaker section of the subject and study hard. So, go ahead and check the Important Notes for Class 09 Science Properties of Fluids.
1. Thrust and pressure : The force applied on a surface in a direction perpendicular (or normal) to the surface is called thrust.
(i) When a body is placed on a horizontal surface, it exerts a thrust equal to its weight on the surface.
(ii) A body resting on a horizontal surface will exert the same thrust irrespective of its orientation. The S.I. unit of thrust is newton (N).
Pressure : Force per unit area of the surface acting in a direction perpendicular (or normal) to it is called pressure (P). If F is the force acting perpendicularly on a surface having an area A, then
Pressure = (Force acting normally on the surface)/(Area A of the surface)
P = F/A
The S.I. unit of pressure is Newton per metre square (Nm-2). Another name for the S.I. unit of pressure is pascal (Pa). 1 Pa = 1 Nm-2
2. Pressure in fluids : A substance which can flow is called a fluid. All liquids and gases are thus fluids.
3. Buoyancy : The tendency of a fluid to exert an upward force on a body immersed partly or wholly in it is called buoyancy.. The resultant upward force experienced by a body when immersed in a fluid is called buoyant force or upward thrust.
4. Apparent loss of weight of a body immersed in a liquid : If you weigh a body in air and next when it is immersed in water (or in any other liquid), then you will find an apparent loss in weight of the body. Loss in weight is equal to upward thrust of the liquid on the body, or
Loss in weight = upthrust of the liquid
5. Principle of floatation : When the buoyant force on a body lowered in a liquid is equal to the weight of the body, the apparent weight of the body is zero and the body floats on the surface of the liquid. Submarines are also based on Archimedes’ Principle, are ships that can submerge in water and travel underneath.
6. Archimede’s principle : When a body is immersed fully or partially in a fluid, it experiences an upward force that is equal to the weight of the fluid displaced by it.
Applications of Archimede’s principle : Archimede’s principle is applied for
(a) determination of density and relative density of substances and
(b) the design of ships and submarines
7. Relative Density : Relative density of any substance is its density relative to that of water.
Mathematically,
Relative density of a substance
= (Density of the substance)/(Density of water)
Relative density is a pure number. It has no units. We know, density of a substance
= (Mass of the substance)/(Volume of the substance)
So, we can write
Relative density of a substance Relative density of a substance
= (Mass of the substance/volume of the substance)/(Mass of water/volume of water)
If the volume of the water is same as that of the substance
Relative density of a substance
(Mass of the substance/volume of the substance)/(Mass of water/volume of water)
If the volume of the water is same as that of the substance
= (Mass of the substance)/(Mass of same volume of water)
Relative density of a solid can be determined by Archimecje’s principle.
Class 9 Key Points, Important Questions & Practice Papers
Hope these notes helped you in your schools exam preparation. Candidates can also check out the Key Points, Important Questions & Practice Papers for various Subjects for Class 9 in both Hindi and English language form the link below.
| Class 9 Maths | कक्षा 9 गणित |
| Class 9 Science | कक्षा 9 सामाजिक विज्ञान |
| Class 9 English | |
| Class 9 Social Science |
Class 9 NCERT Solutions
Candidates who are studying in Class 9 can also check Class 9 NCERT Solutions from here. This will help the candidates to know the solutions for all subjects covered in Class 9th. Candidates can click on the subject wise link to get the same. Class 9 Chapter-wise, detailed solutions to the questions of the NCERT textbooks are provided with the objective of helping students compare their answers with the sample answers.
Class 9 Mock Test / Practice
Mock test are the practice test or you can say the blue print of the main exam. Before appearing in the main examination, candidates must try mock test as it helps the students learn from their mistakes. With the help of Class 9 Mock Test / Practice, candidates can also get an idea about the pattern and marking scheme of that examination. For the sake of the candidates we are providing Class 9 Mock Test / Practice links below.
Class 9 Exemplar Questions
Exemplar Questions Class 9 is a very important resource for students preparing for the Examination. Here we have provided Exemplar Problems Solutions along with NCERT Exemplar Problems Class 9. Question from very important topics is covered by Exemplar Questions for Class 9.
Class 9 Science Notes Maths Notes Social Science Notes English Notes
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