P1- Energy, work done,Specific Heat Capacity,Efficiency,Wind & Solar Flashcards
Name some different types of energy
- Thermal
- Kinetic
- Gravitational Potential
- Elastic Potential
- Chemical
- Magnetic
- Electrostatic
- Nuclear
What is the formula for work done?
W=FxD
Or the triangle :
W
F X D
What is force measure in?
Newtons (N)
What is work done measure in?
Joules (J)
What is distance moved measured in?
Metres (M)
What is the formula for Kinetic Energy?
= 1/2 x mass x speed²
What is the formula for Gravitational Potential Energy?
=mass x gravitational strength x height
NOTE - if the gravitational strength is not given USE 10
OR TRY TO LEARN
GPE M X G X H
.What is the formula for Elastic Potential Energy
= 1/2 x spring constant x extension ²
What are the formulas for Power?
power= energy/time Power= work done/time
What is the formula for efficiency?
= useful output energy transferred by device
—————————————————————
total input energy supplied to the device
What is the conservation of energy principal?
Energy can be transferred usefully, stored or dissipated, but can NEVR be created or destroyed
Where does Convention occur?
Only in liquids and gases
What is Convention?
Where energetic particles move away from hotter or cooler regions
What does Lubrication do?
Reduces frictional forces
What does Insulation do?
Reduces the rate of energy transfer by heating
