Transcript Chapter 12 Using Energy

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
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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