Term 1 Week 8 2019

Homework:

• Ex 2B, p.16-18, Graphing(Complete these for the upcomming Lab Assessment)
• Ex 2C, p.19-25, Identifying Relationships and Experimental Equations(Complete these for the upcomming Lab Assessment)
• Ex 2B, p.23-40, Level 3 Handout booklet on Graphing Errors (Complete these for the upcomming Lab Assessment)
• Ex 4D, p.108-112, Momentum P = mv
• Ex 4C, p.105-107, Impulse ΔP = FΔt
• Ex 4J, p. 143-147 Energy, Work, Power

Energy

Energy can never be created

Energy can never be destroyed

Energy can only change its form (Work is done)

Energy has the ability to make something happen, i.e. to do Work

The unit for energy is the Joule (J)

J = Kgm²s-²  in fundamental units

Perpetual Motion Machine?

A Simple Proof of Conservation of Energy

Work, Energy, and Power

Work, Energy and Power Review

Gravitational Potential Energy and Kinetic Energy Skate Park PhET Link - HTML

Work

Work is a transformation (change) of energy from one form to another form. Work only occurs when something is done.

• Power is the rate at which energy is transformed
• Power is the rate at which work is done
• Unit of power Watt (W = J/s)

Power vs Energy

Work, Energy & Power

Kinetic Energy & Gravitational Potential Energy

Term 1 Week 7 2019

Homework:

• Ex 2B, p.16-18, Graphing(Complete these for the upcomming Lab Assessment)
• Ex 2C, p.19-25, Identifying Relationships and Experimental Equations(Complete these for the upcomming Lab Assessment)
• Ex 2B, p.23-40, Level 3 Handout booklet on Graphing Errors (Complete these for the upcomming Lab Assessment)
• Ex 4D, p.108-112, Momentum P = mv
• Ex 4C, p.105-107, Impulse ΔP = FΔt

Momentum

Conservation of Momentum

In the absence of external forces the total momentum of a system is always conserved

Impulse

The change in Momentum for a single object

ΔP = Pf - Pi

&

ΔP = FΔt

&

ΔP = mΔv

• The unis are eithor Ns or kgms-1 , this is the same unit and the one that is used depends on the context
• Impulse on one object is always equal and opposite to the impulse on the other onject - Newton's Third Law

Physics of Car Crashes (Impulse)

Impulse

Impulse

Impulse examples///Homemade Science with Bruce Yeany

Impulse

Momentum

What is Momentum?

Impulse

Term 1 Week 6 2019

Homework:

• Ex 2B, p.16-18, Graphing
• Ex 2C, p.19-25, Identifying Relationships and Experimental Equations
• Ex 2B, p.23-40, Level 3 Handout booklet on Graphing Errors

Revision for Lab assessment

Errors & Processing - Link (scroll to bottom of page)

What's the difference between accuracy 

and precision? 

(Systematic Error & Ramdom Error)

Term 1 Week 5 2019

Homework:

• Ex 4E, p.115-117 Kinematics (from last week)
• Ex 4F, p.119-124 Projectile Motion (from last week)
• Ex 4A, p.90-94 Vectors (from last week)
• Ex 4B, p.97-104 Forces (from last week)
• Ex 4H, p.132-134, Circular Motion (from last week)
• Ex 2B, p.16-18, Graphing
• Ex 2C, p.19-25, Identifying Relationships and Experimental Equations
• Ex 2B, p.23-40, Level 3 Handout booklet on Graphing Errors

L2 Relationships Videos (click here)

L3 Errors Videos (click here)

Linerising Graphs in Physics

Linerisation of Data

Uncertainties and Errors

World's Heaviest Weight - the importance of error reduction through measurement

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

How to use Excel for the lab investigation

Mass on a Spring Part 1 - finding average & period

Mass on a Spring Part 2 - Gathering the Raw Data

Mass on a Spring Part 3 - Transforming the Raw Data

Mass on a Spring Part 3a - Correction on Transforming the Raw Data

Mass on a Spring Part 4 - Applying Uncertainties to your Data

Mass on a Spring Part 5 - Transforming Uncertainties

Mass on a Spring Part 6 - Adding Error Bars to your Graph

Mass on a Spring Part 7 - Line of Worst Fit

Term 1 Week 4 2019

Homework:

• Ex 4E, p.115-117 Kinematics (from last week)
• Ex 4F, p.119-124 Projectile Motion (from last week)
• Ex 4A, p.90-94 Vectors (from last week)
• Ex 4B, p.97-104 Forces (from last week)
• Ex 4H, p.132-134, Circular Motion

Circular Motion

• Velocity is always at a tangent to the circle. Even if the speed remains constant, the velocity is changing because it is accelerating.

vc = 2𝝿r/T

• Centrapetal Acceleration is always toward the centre of the circle.
• ac = mv2/r
• Centapetal Force is the Net Force, and is also always towards the centre of the circle.

Fc = mv2/r

Uniform Circular Motion

Circular Motion

PHet Application on Circular Motion

Derivation of Centripetal Acceleration

Centrapetal vs Centrafugal

Faking Gravity

What is the Coriolis Effect?

Term 1 Week 3 2019

Homework:

• Ex 4E, p.115-117 Kinematics (from last week)
• Ex 4F, p.119-124 Projectile Motion
• Ex 4A, p.90-94 Vectors
• Ex 4B, p.97-104 Forces

Projectile Motion

See Projectile Motion Videos at the bottom of the Mechanics Webpage - link here

PhET - Projectile Motion  - link here

Projectile Motion - Khan Academy

Horizontal & Vertical Vectors in Projectile Motion

Introduction to Projectile Motion

Vectors

A vector has a magnitude (size) and direction

Vector Addition

• Always add Head to Tail
• It does not matter which order you add vectors

Vectors Physics, Basic Introduction, Head to Tail Graphical Method of Vector Addition & Subtraction

Adding & Subtracting Vectors

What is a Vector?

Forces

Mass on a Slope

Drawing a Free Body Diagram

Net Force - PhET Application - link here

What is a Force?

What Forces are Acting on You?

Best Film on Newton's Third Law Ever

What is Gravity

The Difference Between Mass & Weight

Misconception About Falling Objects

Term 1 Week 2 2019

Homework:

• Ex 4E, p.115-117, Kinematic Equations

Kinematic Equations

Only used when an object is accelerating

vf = vi + at	← missing d
vf2 = vi2 + 2ad	← missing t
d = vit + ½at2	← missing vf
d = (vi + vf)t/2	← missing a

Choose the kinematic equation based on:

• what quantities you are given
• what quantity is asked for
• what quantity is not involved

 

Using Kinematic Equations

Algebra Review - Manipulating Equations in Physics