Energy 1 Flashcards
What is the equation linking kinetic energy, mass and velocity?
Ek= 0.5mv2
What are the units of energy?
joules
What are the units of mass?
kilograms
What are the units of velocity?
metres per second
What is the equation linking gravitationa field strength, gravitational potential energy and height?
Ep=mgh
What are the units of gravitational field strength?
newtons per kilogram
What is the equation linking energy transferred, power and time?
P=E/t
What are the units of power?
Watts
What is the definition of power?
Power is the rate of transfer of energy or the rate of doing work
What is the equation linking power, time and work done?
P=W/t
What are the units of work done?
joules
What is the equation for calculating efficiency from energy?
Efficiency = useful energy output/total energy input
What is the equation for calculating efficiency from power?
Efficiency = useful power output/useful power input
What is the type of energy transferred when a force moves through a distance?
Mechanical transfer
Mechanical transfer is??
The energy transfer when a force moves through a distance
Electrical transfer is??
energy transferred when a charge moves?
What is the energy transferred when a charge moves?
electrical transfer
What is the energy transferred by electromagnetic radiation?
Radiation transfer
Radiation transfer is??
The energy transferred by electromagnetic radiation.
Heat transfer is??
Energy transferred when an object is heated.
When an object is heated the energy transferr is a??
heat transfer
List the 4 energy transfer pathways.
Mechanical, electrical, radiation and heat.
List 4 energy stores.
Four from: chemical, kinetic, gravitational potential, elastic potential, internal, nuclear, magnetic, electrostatic.
Energy stored in objects which move.
kinetic
What is a kinetic energy store
Energy stored in objects which move
Chemical energy is stored as??
chemicals waiting to react
A battery is a store of __________ energy.
chemical