energy an object is said to have “energy” if the object has the ability to change its...

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Energy an object is said to have “energy” if the object has the ability to change its environment Two ways to transfer energy 1. through the application of a force (work) 2. waves a disturbance (oscillation) that transfers energy through matter or space (no forces involved)

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Page 1: Energy an object is said to have “energy” if the object has the ability to change its environment Two ways to transfer energy 1. through the application

Energy

an object is said to have “energy” if the object has the ability to change its environment

Two ways to transfer energy

1. through the application of a force (work)

2. waves a disturbance (oscillation) that transfers energy through matter or space (no forces involved)

Page 2: Energy an object is said to have “energy” if the object has the ability to change its environment Two ways to transfer energy 1. through the application

Two types of waves

1. Electromagnetic (EM) a wave that does not need a medium to travel through

• We will assume that all electromagnetic waves travel at the speed of light (3 x 108 m/s)*

• in vacuum 2.99792458 x 108 m/s

• in air 2.99704645 x 108 m/s

• in water 2.24900569 x 108 m/s

• in glass 2.05618970 x 108 m/s

medium a material through which a wave can travel (i.e. solid, liquid, gas)

Page 3: Energy an object is said to have “energy” if the object has the ability to change its environment Two ways to transfer energy 1. through the application

Two types of waves

1. Electromagnetic (EM) a wave that does not need a medium to travel through

Page 4: Energy an object is said to have “energy” if the object has the ability to change its environment Two ways to transfer energy 1. through the application

Two types of waves 1. Electromagnetic (EM) a wave that does not need a medium to travel through

medium a material through which a wave can travel (i.e. solid, liquid, gas)

2. Mechanical a wave that needs a medium to travel through

Examples:

•Sound

•Earthquake waves

Page 5: Energy an object is said to have “energy” if the object has the ability to change its environment Two ways to transfer energy 1. through the application

Two types of mechanical waves

1. transverse wave

particles of the medium vibrate perpendicularly to the direction of wave travel (s-wave (secondary) earthquake waves)

Page 6: Energy an object is said to have “energy” if the object has the ability to change its environment Two ways to transfer energy 1. through the application

Two types of mechanical waves

2. longitudinal / compression wave

particles of the medium vibrate parallel to the direction of wave motion (p-wave (primary) earthquake waves, sound, deep water waves)

Page 7: Energy an object is said to have “energy” if the object has the ability to change its environment Two ways to transfer energy 1. through the application

Two types of mechanical waves

surface waves (Rayleigh) a combination of transverse and longitudinal waves (surface water waves, earthquake)

Page 8: Energy an object is said to have “energy” if the object has the ability to change its environment Two ways to transfer energy 1. through the application

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