9th Class Physics Unit 7 Notes, MCQs and Short Questions Kinetic molecular model explains the three states of matter assuming that: Matter is made up of particles called molecules The molecules remain in continuous motion Molecules attract each other. At very high temperature, the collision between atoms and molecules tears off their electrons. Atoms become … Read more
9th Class Physics Chapter 6 Notes, MCQs and Short Questions Work is said to be done when a force acting on a body moves it in the direction of the force. work = W SI unit of work is joule (J) When we say that a body has energy, we mean that it has the … Read more
9th Class Unit 5 Notes of Physics, MCQs and Short Questions Newton’s law of universal gravitation states that everybody in the universe attracts every other body with a force which is directly proportional to the product of their masses and inversely proportional to the square of the distance between their centres. The Earth attracts a … Read more
9th Class Physics Chapter 4 Notes, MCQS and Short Questions Parallel forces have their lines of action parallel to each other. If the direction of parallel forces is the same, they are called like parallel forces. If two parallel forces are in opposite direction to each other, then they are called unlike parallel forces. The … Read more
9th Class Physics Chapter 3 Notes, MCQS and Short Questions A force is a push or pull. It moves or tends to move, stops or tends to stop the motion of a body. Inertia of a body is its property due to which it resists any change in its state of rest or uniform motion … Read more
