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
The benefits of buying summaries with Stuvia:
Guaranteed quality through customer reviews
Stuvia customers have reviewed more than 700,000 summaries. This how you know that you are buying the best documents.
Quick and easy check-out
You can quickly pay through credit card for the summaries. There is no membership needed.
Focus on what matters
Your fellow students write the study notes themselves, which is why the documents are always reliable and up-to-date. This ensures you quickly get to the core!
Frequently asked questions
What do I get when I buy this document?
You get a PDF, available immediately after your purchase. The purchased document is accessible anytime, anywhere and indefinitely through your profile.
Satisfaction guarantee: how does it work?
Our satisfaction guarantee ensures that you always find a study document that suits you well. You fill out a form, and our customer service team takes care of the rest.
Who am I buying these notes from?
Stuvia is a marketplace, so you are not buying this document from us, but from seller teeliianna. Stuvia facilitates payment to the seller.
Will I be stuck with a subscription?
No, you only buy these notes for £5.39. You're not tied to anything after your purchase.
