Energy conservation and transfer

What is a closed system?

↳ No energy can escape or enter the system

What are some examples of energy stores and where does the enerfy come from?

↳ Kinetic- energy from movement

↳ Gravitational potential- from height

↳ Elastic potential- energy an object has when streched/copresses

↳ Thermal- energy from temperature

↳ Chemical- energy that can be transferred by chemical raection

↳ Nuclear- energy from atomic nuclei

↳ Magnetic- energy from magnetic fields

↳ Electristatic- energy from electric charges (near charged objects)

How can energy be transferred from different stores?

↳ Heating- one object to one with lower temperature

↳ Eletricity- eletric current

↳ Forces- when a force moves or changes shaoe of an object

↳ Waves

What is work done?

↳ When an object is moved by an object

What is the law of conservation of energy?

↳ Energy cannot be created or destroyed

What is lubrication?

↳ Way to reduce unwanted energy transfer due to friction

What is streamlining?

↳ Way to reduce unwanted energy due to air resistance or drag in water (eg-insulation)

What efficiency?

↳ A measure of how much useful energy is transferred

What does thermal conductivity show you?

↳ How quickly energy is transferred

What is a thermal insulator?

↳ A material with low thermal conductivity in order to reduce the transfer of heat energy

What is specific heat capacity?

↳ The amount of energy needed to raise the temperature of 1 kilogram of a substance by 1°C

What effects temperature when an object is heated?

↳ Mass

↳ Type of material

↳ How much energy is transferred