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Topic: Waves
Aim: How do waves behave?
Do Now:
Take out the Energy ISN from yesterday
Take out your KE and PE reading notes
HW: Study for tomorrow’s test\
Newton’s Laws Reading Notes due Thursday
2. Which skier will have a greater potential energy? Support your answer.
Skier 1 has more potential energy.
The skier 1 is higher than skier 2.
3. At which two points on the pendulum, is the pendulum experiencing the greatest potential energy?
Greatest potential energy at points A and D.
1. At which points is the pendulum experiencing the greatest potential energy?
A and C
2. At which points is the pendulum experiencing the greatest kinetic energy?
B
3. Describe the energy transformation occurring as the pendulum swings from A to B.
PE is being transformed to KE.
4. Describe the energy transformation occurring as the pendulum swings from B to A.
KE is being transformed to PE.
A B
C
D
Identify each part of a wave labeled in the diagram above.
CREST WAVELENGTH
AMPLITUDE
TROUGH
1. Which wave has the greatest amplitude?
2. Which wave has the greater wavelength?
3. Which wave has the greater frequency?
B
A
B
1. Describe reflection.
• Bouncing back of a wave after it strikes a boundary that does not absorb all of the waves energy.
2. Describe the following parts of a wave.
•Incident wave: incoming wave
• Reflected wave: wave that is bounced back
• The normal: Line perpendicular to the banner
3. Describe the angle of incidence.
• Angle formed by the incident ray and the normal
4. Explain what the law of Reflection states.
• Angle of incidence = angle of reflection
5. Draw a diagram demonstrating the law of reflection. Label the incident ray, reflected ray, and the normal. Normal
A B
C
Echoes = sound reflecting
6. Describe refraction.
• Bending of waves
7. Explain why refraction occurs.
• Waves move at different speeds in different mediums
8. Draw a diagram of refraction of a wave in a beaker of water. Label the incident ray, refracted ray and the normal.
Incident Ray
Refracted Ray
Normal
When water droplets act as a prism, a RAINBOW is formed.
Have you ever noticed that objects underwater seem closer to the surface than they really are? The light waves reflected from the swimmer’s foot are refracted away from the normal and enter your eyes.
Let’s summarize…
1.Explain the difference between reflection and refraction.
2.Describe the law of reflection.
3.Explain why refraction occurs.
Identify the source of energy used (mechanical, thermal (heat), electrical, chemical, nuclear)
1. Moving river water
2. Food3. Lightening
4. Produced as a result of friction
5. Oven
6. Roller coaster
7. Battery
8. Hot iron
9. Coal
10. Stored in an atom’s nucleus
MechanicalChemical
ElectricalThermal
ThermalMechanical
Chemical
ThermalChemical
Nuclear
Identify the following energy sources as renewable or nonrenewable.
1.Solar
2.Natural Gas
3.Geothermal energy
4.Wind
5.Hydroelectricity
6.Fossil fuels
7.Coal
8.Biomass
9.Petroleum
Renewable
NonrenewableRenewable
RenewableRenewable
Nonrenewable
NonrenewableRenewable
Nonrenewable
