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GCSE/IGCSE Physics Summary Notes (A* Student) - Unit 2 Newtonian Mechanics (General physics for CIE/ CAIE, AQA, Edexcel and OCR) CA$9.97   Add to cart
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GCSE/IGCSE Physics Summary Notes (A* Student) - Unit 2 Newtonian Mechanics (General physics for CIE/ CAIE, AQA, Edexcel and OCR)
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  • Course
  • Unit 2 - Newtonian mechanics (6025)
  • Institution
  • CIE

General physics, Thermal physics, Properties of waves, including light and sound, Electricity and magnetism, Atomic physics

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  • January 17, 2023
  • 3
  • 2022/2023
  • Summary

Subjects

  • igcse physics notes
  • gcse physics notes

Written for

  • A/AS Level
  • CIE
  • Physics
  • Unit 2 - Newtonian mechanics (6025)
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Energy




Types of energy

Kinetic energy - energy of a moving object
Kinetic energy = 1/2mv2
Gravitational potential energy (g.p.e.) - energy of an object being raised up against gravity
gain/lose in g.p.e. = mgh
Chemical energy - stored in chemical substance, released in chemical reaction
Elastic Strain energy - energy when open object is being stretched or compressed
Nuclear energy - energy stored in the nucleus of an atom, ex: all radioactive material
Internal energy - total kinetic and potential energies of an object’s particle, energy stored in hot object
Thermal energy - energy being transferred due to the difference in temperature, energy spreading out
from hot object

Energy transfers
● By force.
○ Lifting something- give it g.p.e.
○ Moving something- give it kinetic energy
● By heating
○ Thermal energy spread out from hot objects
● By radiation
○ Light from the Sun to Earth, transferred as infrared, ultraviolet radiation
● By electricity
○ Transferred by heating and waves

Energy conservation

In any energy conservation, the total amount of energy
before and after conservation is constant.

Energy efficiency -fraction of the energy that ends up in the desired form.

No system is perfect. Whenever there is a change in a system, energy is transferred and some of that
energy is dissipated ( wasted ).

Efficiency = useful energy out put x 100% Efficiency = useful power out put x 100%
energy input power in put

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