Term 2 Week 2 2019

Homework:

• Ex 4J, p. 143-147 Energy, Work, Power
• Ex 4I, p.137-141, Springs
• Ex 4G, p.125-130, Torque - Static Moments

Torque

𝝉 = F L⦜

𝝉: Torque (Nm)

F: applied Force (N)

L⦜: Length of lever at right angles to the applied force (m)

• Torque (Moments) in Level 2 Physics will involve Static Systems
• Therefore the Torques are balanced and the Forces are balanced - Newton's Laws of Motion apply to turning forces as well as linear forces
• PhET - Torque Balancing Act simulation

Bridge support forces moments

Torque (Moments anout a point)
Static (unmoving) systems will be used for this section. Therefore all forces, linear and turning, are balanced

Torque

Term 2 Week 1 2019

Homework:

• Ex 4J, p. 143-147 Energy, Work, Power
• Ex 4I, p.137-141, Springs

PhET - Hooke's Law & Springs - HTML

Hooke's Law

Hooke's Law Introduction - Force of a Spring

Hooke's Law F = -kx

Elastic Potential Energy

Intro to Springs and Hooke's Law

Potential Energy Stored in a Spring

How Hard Can You Hit A Golf Ball?

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?