Chapter 12 Using Energy

Lesson 1 Heat Heat- the total amount of thermal energy an object releases Temperature- the measurement of the average energy of molecules 1

How does heat travel? Conduction – passing of heat through a material while the material stays in place Convection – flow of thermal energy through a liquid or gas, hot rises and cool sinks Radiation – transfer of energy through electromagnetic rays 1

Lesson 2 Sound Sound wave – series of rarefactions & compressions through a substance

Medium – substance through which the wave travels *Sound tends to travel with the greatest speed through solids and slowest through gases Frequency - number of times an object vibrates per second 2

Lesson 3 Light Photon – tiny bundle of energy by which light travels Translucent – objects that blur light as it passes through Image – a “picture” of the light source that light makes bouncing off shiny surfaces

Prism – a way to separate light Electromagnetism – the way electric & magnetic forces interact 3

Lesson 4 Electricity Electricity – the movement of electrons

Circuit – formed when an electric current passes through an unbroken path of conductors 4

Lesson 5 Magnetism Magnetism – the ability of an object to puch or pull on another object that has the magnetic property Magnetic field – a region of magnetic force around a magnet, represented by lines