energy stores and transfers

name the eight energy stores

kinetic, gravitational potential, elastic potential, thermal, chemical, nuclear, magnetic, electrostatic

name the four ways in which energy can be transferred

heating, waves, electric current, mechanically

what is a system?

an object or a group of objects

what is a closed system?

a system where no energy can enter or exit from the surroundings

what is work done?

energy transferred when a force moves an object

what is the unit for energy?

joules (J)

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 its brakes

name the unit that represents one joule transferred per second

watts (W)

what does a materials thermal conductivity tell you?

how well it conducts heat

which materials have low thermal conductivity?

thermal insulators

give three factors that determine the rate of thermal energy transfer through a material

thermal conductivity of a material, temperature difference, thickness of material

what factors affect the rate of heat loss from a building?

thickness of walls and roof, thermal conductivity of walls and roof, the temperature difference between the two sides of wall

describe the energy transfer when an electric kettle is used to heat water

the electric current in. kettle transfers energy to the heating elements thermal store - energy is then transferred by heating from the heatings elements thermal store of the surroundings

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