#physics #textbook #energy #energystores #energytransfer
Ch:- 6
Pg:- 103,104,105
energy stores represent different forms in which energy can be held or "stored"
Energy can be transferred between these stores but is neither created nor destroyed
Kinetic Energy
The energy an object has due to its motion.
Example: A moving car, spinning fan, or flowing river has kinetic energy.
Gravitational Potential Energy
The energy stored in an object is due to its position in a gravitational field, typically due to height above the ground.
Example: A rock held above the ground, water in a reservoir, or a person standing on a ladder.
Elastic Potential Energy
The energy stored when an object is stretched or compressed, such as in springs or elastic materials.
Example: A compressed spring, a stretched rubber band, or a drawn bow.
Chemical Energy
The energy is stored in the chemical bonds of molecules. Released during chemical reactions, such as combustion or metabolism.
Examples: Batteries, fossil fuels (coal, oil), and food.
Thermal Energy
The internal energy is stored in the random motion and vibration of atoms and molecules within a substance. Often associated with temperature.
Example: Hot coffee, warm air, or heated water.
Magnetic Energy
The energy is stored in magnetic fields, especially in systems with magnets or electric currents.
Example: Two magnets near each other, a coil carrying current, or the Earth’s magnetic field.
Electrostatic Energy Store
The energy stored in the electric field between charged objects. It depends on the positions and magnitudes of the charges.
Example: Charges on a capacitor, charged particles, or static electricity.
Nuclear Energy Store
The energy stored in the nucleus of an atom. Released during nuclear reactions like fission or fusion.
Example: Energy produced by nuclear power plants, the sun, or radioactive decay.
Energy Transfers:
Energy can be transferred between these stores in four main ways:
Mechanical work (e.g., pushing, pulling, twisting)
Electrical work (e.g., energy transferred by electric currents)
Heating (e.g., conduction, convection, radiation)
Radiation (e.g., light or sound waves)
How do energy stores change during physical processes like heating or cooling?
What are some examples of renewable energy stores, and how do they work?
How is energy stored in batteries, and what are the principles behind it?
How do gravitational energy stores work, and where can we observe them in everyday life?
What is the role of chemical energy in biological systems?