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[PDF] Download Revision Notes for Class 8 Science Chapter 11 Force and Pressure
Here we are providing revision notes for class 8 science. We have two types of revision notes for class 8 science (i) Short revision notes (ii) Detailed revision notes. In this article, we are covering short revision notes for CBSE class 8 science Chapter 11 Force and Pressure.
Force and Pressure Revision Notes
- Force: A push or a pull, that changes or tends to change the state of rest or of uniform motion of an object or changes its direction or shape.
- A force arises due to the interaction between two objects.
- Force has magnitude as well as direction. The SI unit of force is newton.
- A change in the speed of an object or the direction of its motion or both implies a change in its state of motion.
- Force acting on an object may cause a change in its state of motion or a change in its shape.
- A force can act on an object with or without being in contact with it.
Types of Forces:
Contact Forces: The forces act on a body when the source of force is in actual contact with the body. The point where the force is applied on an object is called the point of application of force (or point of contact). - (i) Muscular Force: The force exerted by the muscles of the body. We make use of muscular force of animals like bullocks, horses and camels to get our activities done.
- (ii) Mechanical Force: The force produced by a machine.
- (iii) Frictional Force: The force that opposes the motion of an object.
Non-Contact Forces: Forces which do not involve physical contact between two bodies on which they act.
(i) Magnetic Force: A magnet exerts a non-contact force on objects made of iron, steel, cobalt or nickel.
(ii) Electrostatic Force: The force which result due to repulsion of similar charges or attraction of opposite charges.
(iii) Gravitational Forces: The force that exists between any two bodies by virtue of their mass.
- Pressure: Thrust acting per unit surface area is called pressure. Thrust is the force acting on an object perpendicular to its surface. In SI system, pressure is measured in newton per square metre which is equal to 1 pascal (Pa).
- Like solids, fluids (liquids and gases) also exert pressure. A solid exerts pressure only in the downward direction due its weight, whereas liquids and gases exert pressure in all directions. Hence liquids and gases exert pressure on the walls of their container.
- The thick blanket of air that covers the earth is termed atmosphere. The pressure exerted by the atmosphere is called atmospheric pressure. The tremendous atmospheric pressure surrounding us is not felt by us because the fluid pressure inside our bodies counter-balances the atmospheric pressure around us.
Chapter List
Chapter 1 Crop Production and Management
Chapter 2 Microorganisms: Friend and Foe
Chapter 3 Synthetic Fibres and Plastics
Chapter 4 Materials: Metals and Non-Metals
Chapter 5 Coal and Petroleum
Chapter 6 Combustion and Flame
Chapter 7 Conservation of Plants and Animals
Chapter 8 Cell Structure and Functions
Chapter 9 Reproduction in Animals
Chapter 10 Reaching the Age of Adolescence
Chapter 11 Force and Pressure
Chapter 12 Friction
Chapter 13 Sound
Chapter 14 Chemical Effects of Electric Current
Chapter 15 Some Natural Phenomena
Chapter 16 Light
Chapter 17 Stars and the Solar System
Chapter 18 Pollution of Air and Water
Benefits of Using One Page Revision Notes for Class 8 Science
Here are the benefits of using one-page revision notes for CBSE Class 8 Science:
- Concise Overview: One-page revision notes condense important information from each chapter into a single page, providing a quick and comprehensive overview of the entire syllabus.
- Time-Saving: These notes save valuable study time as they allow students to quickly review key concepts without going through lengthy textbooks or extensive notes.
- Effective Recap: One-page notes serve as an efficient tool for last-minute revision before exams, helping students refresh their memory and reinforce their understanding of critical topics.
- Easy to Carry: Students can easily carry these compact notes anywhere, making them convenient for on-the-go studying, whether at school, home, or during travel.
- Improved Focus: The condensed format encourages students to concentrate on the most essential points, reducing the risk of distraction from irrelevant information.
- Enhanced Retention: Summarized information is easier to remember, making it ideal for retaining key concepts and formulas for the exam.
- Organization: One-page notes often follow a structured format, aiding in the organization of information and making it easier for students to locate specific topics.
- Quick Reference: During the exam, one-page notes can be used as a quick reference guide to quickly recall important facts and concepts.
- Boosted Confidence: Having concise revision notes can boost students’ confidence in their exam preparedness, as they can easily review the entire syllabus in a short amount of time.
- Customization: Students can create their own one-page notes, allowing them to personalize the content to suit their learning style and preferences.
- Comprehensive Coverage: Despite their brevity, one-page notes should cover all essential topics and concepts, ensuring students don’t miss any important information.
In summary, one-page revision notes for CBSE Class 8 Science offer a convenient and effective way for students to review and consolidate their knowledge, ultimately aiding in better exam performance.
