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# ICSE Class 9 Physics Chapter 4 Pressure in Fluids and Atmospheric Pressure Revision Notes

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## ICSE Class 9 Physics Chapter 4 Revision Notes: Pressure in Fluids and Atmospheric Pressure

ICSE Class 9 Physics Chapter 4 Pressure in Fluids and Atmospheric Pressure Revision Notes are one of the most important pieces of study material that students can receive as it will aid them to study better and reduce the level of stress that students face during the hectic year.

Swiflearn provides Revision Notes and keynotes chapter wise for the ICSE board exam in an easy-to-understand, free downloadable PDF format so students can use it for their studies and score better in their board exams. The ICSE Class 9 Revision Notes are made for the main subjects of Science and Maths. These core subjects are very critical as they are the stepping stones and plays a crucial role in student’s future. They might be tricky for students. The ICSE Class 9 Physics Revision Notes for each chapter will enable them to have an expert studying pattern with which they can enjoy learning the subject and perform better in the exams.

ICSE Class 9 Physics Chapter 4 Pressure in Fluids and Atmospheric Pressure Revision Notes are designed  keeping in my mind the exam pattern and syllabus of NCERT 2020-21. Students can download the PDF for free and practice the questions to score well in the coming exams.

## ICSE Class 9 Physics Chapter 4 Revision Notes: Pressure in Fluids and Atmospheric Pressure

Newton’s First Law of Motion: –

Newton’s First Law states that an object will remain at rest or in uniform motion in a straight line unless acted upon by an external force.

Kinds and Inertia:

1. Inertia of Rest: If a body is at rest, it will continue to remain at rest unless a force from outside is applied to change its state of rest.
For example, with a quick pull, a table cloth can be removed from a dining table without disturbing dishes on it.
2. Inertia of Motion: A body in a state of motion continues to be in the state of motion with the same speed in the same direction in a straight line unless an external force is applied on it to change its state
For example, a train stop suddenly, the passenger tends to lean forward

Inertia:

A property of matter by which it continues in its existing state of rest or uniform motion in a straight line, unless that state is changed by an external force.

Force:

Force is that external cause which tends to change the state of rest or the state of motion of an object.
1. Force is a vector quantity.
2. Sum of two equal and opposite forces is zero.
3. A body acted upon by several forces can also have the resultant net force on it equal to zero.

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