Week 26 - Energy (Part 4)
Introduction to Energy
Learning Target: I can identify and investigate mechanical and electromagnetic waves
Warm - Up
2/27/2020
1) In what form does most energy travel throughout our universe?
2) What was the loudest sound ever made in recorded history?
3) Through what state of matter will mechanical waves travel the fastest?
Word Wall
Energy - the ability to do work.
Law of conservation of energy - states that energy cannot be created or destroyed; it can only be changed from one form of energy to another.
Wave - a disturbance that transmits energy through matter or empty space
Medium - Matter through which a wave travels
Mechanical Waves - waves that require a medium through which to travel
Vibration - A repeated back-and-forth or up-and-down motion
Transverse Waves - Waves that move the medium at right angles to the direction in which the waves travel
Crest - the highest point of a transverse wave
Trough - the lowest point of a transverse wave
Longitudinal wave - A wave that moves the medium in a direction parallel to the direction in which the wave travels.
Compression - The part of a longitudinal wave where the particles of the medium are close together.
Rarefaction - a part in a longitudinal wave where the particles are spread apart
Amplitude - the height of a wave's crest
Wavelength - The distance between two corresponding parts of a wave
Frequency - the number of complete wavelengths that pass a point in a given time
Hertz - Unit of measurement for frequency
Reflection - The bouncing back of a wave when it hits a surface through which it cannot pass.
Refraction - The bending of a wave as it passes at an angle from one medium to another
Diffraction - The bending of a wave as it moves around an obstacle or passes through a narrow opening
Interference - The interaction between waves that meet. Waves can overlap when they meet.
Constructive Interference - The interference that occurs when waves combine to make a wave with a larger amplitude.
Destructive Interference - The interference that occurs when two waves combine to make a wave with a smaller amplitude
Standing Wave - a wave that appears to stand in one place, even though it is really two waves interfering as they pass through each other
Resonance - an increase in amplitude that occurs when an object vibrating at its natural frequency absorbs energy from a nearby object vibrating at the same frequency
Absorbed Light - Light that enters but does not leave an object
Transmitted light - light that passes through the object
Lesson
intro_waves ppt inst approach.pptClasswork
Kahoot and Quizlet Live Review today
Homework
1) Watch each activator video
2) Read Chapter 20: The Energy of Waves
Pages 574 - 589
Username: 8thgrade8 | Password: excellence
3) Complete USATestprep "Introduction to Waves" all sections