10 Questions
What is the fundamental principle in physics stating that energy is never created or destroyed, only transferred between different forms and objects?
Law of Conservation of Energy
Name three different forms of energy mentioned in the text.
Thermal/internal energy, kinetic energy, gravitational potential energy
How can energy be transferred between different energy stores?
Through mechanical, electrical, heating, or radiation processes
What is a system in physics and how does it differ in open and closed systems?
A system is a collection of matter where energy can be transferred between objects. In open systems, energy can be exchanged with the outside world, while in closed systems, neither matter nor energy can enter or leave.
What is the overall change in energy in closed systems?
Zero
What causes sparks when static electricity is discharged?
Flow of electrons in insulating materials
Why do insulating materials like polythene rod and cloth retain static charge?
Because they are poor conductors of electricity
What prevents the build-up of charge in conducting materials like metal?
Ease of electron flow back into the material
How do electrons flow during rubbing to determine charges on materials?
Electrons flow from insulating to conducting materials
What can lead to charges building up on conductors like cars according to the text?
Wind transferring protons to the car's surface
Study Notes
- Energy is never created or destroyed, only transferred between different forms and objects, which is a fundamental principle in physics.
- Different forms of energy include thermal/internal energy, kinetic energy, gravitational potential energy, elastic potential energy, chemical energy, magnetic energy, electrostatic energy, and nuclear energy.
- Energy can be transferred between these energy stores through mechanical, electrical, heating, or radiation processes.
- A system in physics refers to a collection of matter, where energy can be transferred between objects or different forms within an open system that can exchange energy with the outside world.
- In closed systems, neither matter nor energy can enter or leave, so the overall change in energy is always zero.
Test your knowledge of different forms of energy and systems in physics. Learn about thermal, kinetic, gravitational potential, elastic potential, chemical, magnetic, electrostatic, and nuclear energy. Understand how energy is transferred between these forms through various processes.
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