Week 27 - Energy (Part 1)
Introduction to Energy
Learning Target: I can identify and investigate mechanical and electromagnetic waves
Warm - Up
3/2/2020
No warm up today.
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
Absorption - when a wave comes into contact with a medium and causes the medium's molecules to vibrate and move by transferring some of its energy
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
Homework
1) Watch each activator video
2) Read Chapter 21: The Nature of Sound
Pages 600 - 621
Username: 8thgrade8 | Password: excellence
3) Complete USATestprep "Introduction to Waves (PART 2)" all sections