Notes – Page 7

Chapter 5. Heat and Energy

March 3, 2021January 1, 2021 by ap-admin

Heat – Transfer of Heat * Heat flows from a hotter object to a colder object. * He heat flows a hot body is gradually transferred the particles of the surrounding air that are comparatively cooler. * The process by which heat is transferred from the hotter part to the colder part of an object, ... Read more

Chapter 4. Fluids

March 9, 2021January 1, 2021 by ap-admin

Pressure * Pressure is the amount of force acting on a unit surface area. * Pressure is calculated by dividing force with area. * Like solids, all fluids exert pressure. * Matter that has a tendency to flow is termed as a fluid. * Dams can break down due to the force that is caused ... Read more

Chapter 3. Laws of Motion

March 10, 2021January 1, 2021 by ap-admin

Universal Law of Gravitation * The force of attraction between any two bodies applies to all the bodies in the universe. * The moon revolving around the earth is under the action of centripetal force. The magnitude of gravitational force varies with the: * Distance of the object from the earth * Mass ... Read more

Chapter 2. Motion in One Dimension

April 29, 2021January 1, 2021 by ap-admin

Motion and Measurement of Distance - Rest and Motion * A body is said to be at rest when it remains in its position for a long time (there is no change in its position). * A body is said to be in motion if it is changing its position with respect to its surrounding ... Read more

Chapter 1. Measurement and Experimentation

March 22, 2021January 1, 2021 by ap-admin

Motion and Time - Time and Speed * An object that covers less distance in a given time is said to be moving slow. * The one that covers more distance in the same time is said to be moving fast. * Speed is the distance covered by an object in unit time. * An ... Read more

Chapter 4. Food Security in India

March 3, 2021January 1, 2021 by ap-admin

Introduction to Food Security * Food security exists when there is enough food available, accessible and affordable for all. * The problem of food security assumes larger proportions in natural disaster. * A natural calamity affecting a large area for a long duration of time leads to starvation and conditions of famine. Food Insecure Groups ... Read more

Chapter 3. Poverty as a Challenge

January 30, 2021January 1, 2021 by ap-admin

Poverty – Introduction * Poverty is defined as the lack of common things like food, clothing, shelter, safe drinking water, medical care and education, which determine the quality of life. * The concept of social exclusion states that poor people have to live in poor surroundings excluded from neighborhoods of people who are better off. ... Read more

Chapter 2. People As Resource

March 3, 2021January 1, 2021 by ap-admin

Overview * A large population is not always a liability. * Education, good medical care and training are the three investments that transform people into assets or resources. * The investment in education, training and healthcare of people is more than recovered by the higher productivity of the healthy, skilled workforce that it produces. Economics ... Read more