Week 2 Term 2 Torque

  Homework

Vectors

• Act 9A Vectors p.108-109
• Ex 4A Vectors p.90-94

Kinematics

• Act 8B Graphs of motion p.101
• Act 8C Kinematics p.102
• Ex 4E Kinematics p.115-117

Projectile Motion

• Act 12B Projectile Motion p.140-141
• Ex 4F Projectile Motion p.119-124

Forces

• Act 10A Forces p.117-118
• Act 10B Forces p.123-124
• Ex 4B Forces p.97-104

Circular Motion

• Act 13A p.148-149 Circular Motion
• Ex 4H p.132-134 Circular Motion

Energy

• Act 14B, p. 158-160 Combined Mechanics
• Ex 4J, p. 143-147 Energy, Work, Power

Springs

• Act 14A p.155 Energy & Springs
• Ex 4I p.137-141 Springs

Momentum & Impulse

• Act 11A, p.130 Momentum and Impulse
• Act 11B, p. 133-134 Collisions
• Ex 4D, p.108-112 Momentum P = mv
• Ex 4C, p.105-107 Impulse ΔP = FΔt

Torque

• Act 10B, p.123-124, Torque
• Ex 4G p.125-130 Torque

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

Torque and Equilibrium

Static Equilibrium, Mobile Calculation

Term 2 Week 1 Momentum & Impulse

 Homework

Vectors

• Act 9A Vectors p.108-109
• Ex 4A Vectors p.90-94

Kinematics

• Act 8B Graphs of motion p.101
• Act 8C Kinematics p.102
• Ex 4E Kinematics p.115-117

Projectile Motion

• Act 12B Projectile Motion p.140-141
• Ex 4F Projectile Motion p.119-124

Forces

• Act 10A Forces p.117-118
• Act 10B Forces p.123-124
• Ex 4B Forces p.97-104

Circular Motion

• Act 13A p.148-149 Circular Motion
• Ex 4H p.132-134 Circular Motion

Energy

• Act 14B, p. 158-160 Combined Mechanics
• Ex 4J, p. 143-147 Energy, Work, Power

Springs

• Act 14A p.155 Energy & Springs
• Ex 4I p.137-141 Springs

Momentum & Impulse

• Act 11A, p.130 Momentum and Impulse
• Act 11B, p. 133-134 Collisions
• 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)

Momentum and Impulse Explained

What Is Conservation of Momentum?

Impulse

Impulse

Impulse examples///Homemade Science with Bruce Yeany

Momentum

Impulse

Momentum does NOT require Mass!!

Term 1 Week 9 Springs

 Homework

Vectors

• Act 9A Vectors p.108-109
• Ex 4A Vectors p.90-94

Kinematics

• Act 8B Graphs of motion p.101
• Act 8C Kinematics p.102
• Ex 4E Kinematics p.115-117

Projectile Motion

• Act 12B Projectile Motion p.140-141
• Ex 4F Projectile Motion p.119-124

Forces

• Act 10A Forces p.117-118
• Act 10B Forces p.123-124
• Ex 4B Forces p.97-104

Circular Motion

• Act 13A p.148-149 Circular Motion
• Ex 4H p.132-134 Circular Motion

Energy

• Act 14B, p. 158-160 Combined Mechanics
• Ex 4J, p. 143-147 Energy, Work, Power

Springs

• Act 14A p.155 Energy & Springs
• 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

Elastic Strain Energy and Hooke's Law

Potential Energy Stored in a Spring

How Hard Can You Hit A Golf Ball?

Term 1 Week 8 Energy Work Power

 Homework

Vectors

• Act 9A Vectors p.108-109
• Ex 4A Vectors p.90-94

Kinematics

• Act 8B Graphs of motion p.101
• Act 8C Kinematics p.102
• Ex 4E Kinematics p.115-117

Projectile Motion

• Act 12B Projectile Motion p.140-141
• Ex 4F Projectile Motion p.119-124

Forces

• Act 10A Forces p.117-118
• Act 10B Forces p.123-124
• Ex 4B Forces p.97-104

Circular Motion

• Act 13A p.148-149 Circular Motion
• Ex 4H p.132-134 Circular Motion

Energy

• Act 14B, p. 158-160 Combined Mechanics
• 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

Conservation of Energy

Work & Transformation of Energy

Power & Work Done

Kinetic Energy

Gravitaional Potential 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

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

Term 1 Week 5 Circular Motion & Lab Investigation

   Homework

Vectors

• Act 9A Vectors p.108-109
• Ex 4A Vectors p.90-94

Kinematics

• Act 8B Graphs of motion p.101
• Act 8C Kinematics p.102
• Ex 4E Kinematics p.115-117

Projectile Motion

• Act 12B Projectile Motion p.140-141
• Ex 4F Projectile Motion p.119-124

Forces

• Act 10A Forces p.117-118
• Act 10B Forces p.123-124
• Ex 4B Forces p.97-104

Circular Motion

• Act 13A p.148-149 Circular Motion
• Ex 4H p.132-134 Circular Motion

Lab Investigation

• 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

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

Can We Create Artificial Gravity?

What is the Coriolis Effect?

The Most Mind-Blowing Aspect of Circular Motion (but don't use this to answer a NCEA Exam! ; )

Revision for Lab assessment

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

What's the difference between accuracy 

and precision? 

(Systematic Error & Ramdom Error)

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