A substance that flows is called a fluid. Fluids exert pressure on the base and walls of the container in which they are enclosed. Pressure exerted in any confined mass of fluid is transmitted uniformly in all directions. Laws of Liquid Pressure (Pressure in Fluids) Pressure in Fluids and Atmospheric Pressure PDF Download PDF
When you strike a tuning fork, it starts vibrating. When this tuning fork is brought near the ear, we hear some sound. When this fork is brought near a hanging ball, the ball starts oscillating. Thus, a vibrating source is necessary for the production of sound. Sound is a mechanical wave and needs a material
Heat is a form of energy. Each object contains matter which is made of molecules. These molecules are in a constant state of motion. This gives them kinetic energy. Also, there is a force of attraction between the molecules. This gives them potential energy. Heat energy is the internal energy of these molecules. More the
Measurement is the process of comparison of the given physical quantity with the known standard quantity of the same nature. A unit is the quantity of a constant magnitude that is used to measure the magnitudes of other quantities of the same nature. The magnitude of a physical quantity is expressed as Physical quantity =
Newton’s first law: If a body is in a state of rest, then it will remain in that state, and if the body is in a state of motion, then it will continue moving with the same velocity in the same direction unless an external force is applied on it. The property of an object
The magnets found in nature are called natural magnets. An artificial magnet is a magnetized piece of iron or any other magnetic material. Some forms of artificial magnets are bar magnets, horseshoe magnets, magnetic needles, magnetic compasses, etc. If a magnet is suspended with a silk thread such that it is free to rotate in
The weight of the object exerts a force on the liquid. The liquid also exerts a certain amount of force on the object in the upward direction. This force is called the buoyant force. The tendency of a liquid to exert an upward force on any object immersed in it is called buoyancy. The upward
Upthrust in Fluids, Archimedes’ Principle and Floatation Read More »
The regular pencil cells used in daily life provide a direct current. Direct current is a current of constant magnitude flowing in one direction. Electric Current is a scalar quantity. Its SI unit is ampere (A). Conventionally, the direction of current is taken in the direction of the flow of positive charge. This direction is
A body is said to be at rest if its position with respect to its surrounding does not change. While a body is said to be in motion if its position changes with respect to its surroundings. One-dimensional motion: When a body moves along a straight line path, its motion is said to be a
The return of light into the same medium after striking a surface is called reflection. We see the objects around us due to reflection. A plane mirror reflects almost all the light falling on it. When a beam of light falls on a smooth and polished surface (a plane mirror), regular reflection occurs. When a