Term 3 Week 2 2017

Homework:

• Ex 3D, p. 75-79 Standing Waves and Music
• Ex 3E, p. 81-84 Beats
• Ex 3F, p. 87-96 Doppler Effect

Doppler Effect

The Doppler Effect: what does motion do to waves?

Doppler Effect

Intro to the Doppler Effect

Doppler Effect Observed Frequency Equation

Doppler Effect Big Bang Style

Term 3 Week 1 2017

Homework:

• Ex 3D, p. 75-79 Standing Waves and Music
• Ex 3E, p. 81-84 Beats

Standing Waves

in musical instruments - when a reflected wave travels back through itself causing fixed points of Nodes (Deconstructive Interference) and Antinodes (Constructive Interference) due to the fractional relationship between the wavelength (𝜆) of the wave and the length (L) of the resonating chamber

Harmonic	String	Double Open Ended Pipe	Closed Ended Pipe
1st	𝜆 = 2L f = f1st	𝜆 = 2L f = f1st	𝜆 = 4L f = f1st
2nd	𝜆 = L f = 2f1st	𝜆 = L f = 2f1st
3rd	𝜆 = ⅔ L f = 3f1st	𝜆 = ⅔ L f = 3f1st	𝜆 = 4/3 L f = 3f1st
4th	𝜆 = ½ L f = 4f1st	𝜆 = ½ L f = 4f1st
5th	𝜆 = ⅖ L f = 5f1st	𝜆 = ⅖ L f = 5f1st	𝜆 = ⅘ L f = 5f1st

Standing Waves Part I: Demonstration

Standing Waves Part II: Explanation

Standing Waves

Making standing waves

Singing plates - Standing Waves on Chladni plates

Acoustic Levitation in ULTRA SLOW MOTION

Beats

two waves of a similar frequency (similar wavelength) superimpose to come in and out of phase causing constructive and deconstructive interference respectively. This causes a warbling/beat sound of frequency (fb) equal to the difference in respective frequencies

fb = | f1 - f2 |

Wave Beats

Easy Beats- Physics

Term 2 Week 10 2017

Homework

• Ex 4H, p. 160-162, Rotational Motion
• Ex 4I, p. 167-171, Angular Momentum
• Ex 4J, p. 175-177, Rotational Kinetic Energy
• Ex 4K, p. 184-187, Simple Harmonic Motion - SHM
• Ex 4L, p. 191-194, SHM & Reference Circle

SHM and Energy

Energy of Simple Harmonic Oscillators

Damped SHM

Damping of Simple Harmonic Motion

Damped SHM & Resonance

PhET - Resonance Lab

Damped SHM & Resonance

Term 2 Week 9 2017

Homework

• Ex 4H, p. 160-162, Rotational Motion
• Ex 4I, p. 167-171, Angular Momentum
• Ex 4J, p. 175-177, Rotational Kinetic Energy
• Ex 4K, p. 184-187, Simple Harmonic Motion - SHM
• Ex 4L, p. 191-194, SHM & Reference Circle

Simple Harmonic Motion - SHM

Masses & Springs PhET Lab

Simple Pendulum PhET Lab

SHM

Simple Harmonic Motion: Crash Course Physics

Pendulum Wave Demonstration

Term 2 Week 8 2017

Working on Lab Assessment 

Phy 3.1 AS 91521 this week

This work around on how to get individual errors bars on Sheets is clunky but it works. It will exclude the trend line function though

Adding Trend Lines in Sheets

Term 2 Week 7 2017

Homework

• Ex 2A, p.19-22, Working with Errors
• Ex 2B, p. 26-37 Data Processing & Errors
• Ex 4H, p. 160-162, Rotational Motion
• Ex 4I, p. 167-171, Angular Momentum
• Ex 4J, p. 175-177, Rotational Kinetic Energy

Angular Momentum

Angular Momentum - Sixty Symbols

Rotational Kinetic Energy

Rotational Kinetic Energy

Term 2 Week 6 2017

Homework

• Ex 2A, p.19-22, Working with Errors
• Ex 2B, p. 26-37 Data Processing & Errors
• Ex 4H, p. 160-162, Rotational Motion
• Ex 4I, p. 167-171, Angular Momentum

Rotational Momentum (Angular Momentum)

For a point mass L = Pr

Linear Momentum times the radius distance between the point mass and the axis of rotation

Momentum: Rotational Linear

Equation: L = I⍵ P = mv

Units: kgm2s-1  kgms-1

• Rotational Momentum and Linear Momentum have different units so they cannot be equated with each other and are independent of each other.
• Rotational Momentum obeys the same law of conservation that Linear Momentum obeys. In the absence of outside forces, total momentum is always conserved.

Conservation of Angular Momentum in the ISS

Mechanics 2015 Question 3 on Cats & Gravity (Conservation of Angular Momnetum L=Iω) 

Examination Paper 2015  AS 91524

Assessment Scedule 2015 AS 91524

Precession

Egg Spinning

Rotational Kinetic Energy

Energy: Rotational Linear

Equation: Ek(rot) = ½I⍵2 Ek(lin) = ½mv2

Units: Joule Joule

• Rotational Kinetic Energy and Linear Kinetic Energy have the same unit so they can be equated with each other and are interdependent on each other.
• The law of conservation of total energy can be applied with all types of energy. You will be using mostly gravitational potential, linear kinetic, and rotational kinetic energies.

• Total Kinetic Energy = Ek(rot) + Ek(lin)

= (½I⍵2) + (½mv2 )