In Class 9 physics, energy is defined as the ability to do work or the capacity to cause a change in an object or a system. Energy exists in various forms and can be transferred or converted from one form to another. Some common forms of energy include:
1. Kinetic Energy: The energy possessed by an object due to its motion. The formula for kinetic energy is KE = (1/2) * m * v^2, where m is the mass of the object, and v is its velocity.
2. Potential Energy: The energy associated with the position or state of an object. It can be gravitational potential energy when an object is raised above the ground or elastic potential energy in a stretched or compressed object.
3. Heat Energy: The energy transferred between objects due to differences in temperature. Heat energy is associated with the random motion of particles in a substance.
4. Chemical Energy: The energy stored in the chemical bonds of atoms and molecules. It is released or absorbed during chemical reactions.
5. Electrical Energy: The energy associated with the flow of electric charge. It is harnessed in electrical circuits to power devices.
6. Light (Radiant) Energy: The energy carried by electromagnetic waves, such as visible light. It is responsible for illumination and vision.
7. Sound Energy: The energy produced by the vibration of particles in a medium and transmitted as sound waves.
Energy can neither be created nor destroyed; it can only change from one form to another. This principle is known as the law of conservation of energy. In physics, the concept of energy is fundamental and plays a crucial role in understanding the behavior of the physical world.
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In Class 9 physics, energy is defined as the ability to do work or the capacity to cause a change in an object or a system. Energy exists in various forms and can be transferred or converted from one form to another. Some common forms of energy include:
1. Kinetic Energy: The energy possessed by an object due to its motion. The formula for kinetic energy is KE = (1/2) * m * v^2, where m is the mass of the object, and v is its velocity.
2. Potential Energy: The energy associated with the position or state of an object. It can be gravitational potential energy when an object is raised above the ground or elastic potential energy in a stretched or compressed object.
3. Heat Energy: The energy transferred between objects due to differences in temperature. Heat energy is associated with the random motion of particles in a substance.
4. Chemical Energy: The energy stored in the chemical bonds of atoms and molecules. It is released or absorbed during chemical reactions.
5. Electrical Energy: The energy associated with the flow of electric charge. It is harnessed in electrical circuits to power devices.
6. Light (Radiant) Energy: The energy carried by electromagnetic waves, such as visible light. It is responsible for illumination and vision.
7. Sound Energy: The energy produced by the vibration of particles in a medium and transmitted as sound waves.
Energy can neither be created nor destroyed; it can only change from one form to another. This principle is known as the law of conservation of energy. In physics, the concept of energy is fundamental and plays a crucial role in understanding the behavior of the physical world.
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