energy work power Flashcards
what is energy
the capacity of something to to do work
what does the law of conservation of energy state
energy cannot be created or destroyed, it can only change from one form to another
what are the 6 different types of energy
- kinetic
- gravitational potential
- elastic
- chemical
- nuclear
- internal
how is energy transferred
- forces
- electrical currents
- heating
- waves
formula for gravitational potential energy
gpe= mass x gravitational field strengthx height
formula for kinetic energy
1/2 x m x v^2
what are the energy resources and their forms
- fuel - chemical
- water -gpe
- waves -ke
- geothermal -internal
- nuclear fission - nuclear
- solar heating -light
- solar cells - light
- wind - ke
efficiency formula 1
(useful energy output/total energy input) x 100%
efficiency formula 2
(useful power output/total power input) x 100%
formula for work donw
work done = force x distance moved
formula for power
power = energy transferred/time taken
formula for pressure 1
pressure = force/area
formula for pressure in liquid
pressure = height x density x gravitational field strength
what is pressure in liquids
- pressure is transmitted equally in all directions
- pressure at different points at the same depth is equal
- the pressure in a liquid depends in the density and depth of a liquid
what are barometers
- used to measure atmospheric pressure
- the weight of the mercury in the tube is balanced by atmospheric pressure pushing down on the mercury in the tray
