Energy Work And Power Flashcards
What is work?
Work is done when a force makes something move. The greater the force and distance moved , the more work is done
Work formula
W = force x distance
Calculated in joules
Energy
Things have energy if they can do work
Energy is measured in joules
Kinetic energy
Energy due to motion
Potential energy
Stored energy
GPE
The energy of a mass due to its position
Nuclear potential energy
Energy stored at the center of atoms
Gravitational potential energy definition
GPE of a object is the energy it has due to its height in a gravitational field
- if a object is lifted, it gains GPE
- if it falls, it looses GPE
GPE formula
GPE =MGH
m = mass
G = gravitational field strength
H = height
Kinetic energy formula
1/2 mass x v^2
Power
The amount of energy transferred
Power formula
Power = work done /time taken
Efficiency
Useful work done/ total energy input
