Energy Stores And Transfers Flashcards
Name the 8 energy stores
Kinetic, gravitational potential, elastic potential, thermal, chemical, nuclear, magnetic, electrostatic
Name the 4 ways in which energy can be transferred
Heating, waves, electric current, mechanically
What is a system?
An object or group of objects
What is a closed system?
A system where no energy can be transferred to or from the surroundings
What is work done?
Energy transferred when a force moves an object
What is the unit for energy?
Joules
What is one joule of work
The work done when a force of 1N causes an object to move 1m in the direction of the force
Describe the energy transfer when a moving car slows down
Energy is transferred mechanically from the kinetic store of the car to the thermal store of the breaks
Describe the energy transfer when an electric kettle is used to heat water
The electric current in a kettle transfers energy to the heating elements thermal store
Describe the energy transfer when a ball is fired using an elastic band
Energy is transferred mechanically from the elastic store of the band to the kinetic store of the band
Describe the energy transfer when a falling apple hits the ground
Energy is transferred from the kinetic store of the apple and dissipated to the thermal store of the surroundings by sound waves
Name the unit that represents one joule transferred per second
Watt
What does a materials conductivity tell you?
How well it conducts heat
Which materials have a low thermal conductivity?
Thermal insulators
Give 3 factors that determine the rate of thermal energy transfer through a material
Thermal conductivity of the material, temp difference, thickness of the material
