Tuesday, 30 April 2024

Week 1 Term 2 2024 Torque

Homework

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

Vectors

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

Forces

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

Circular Motiuon

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

Springs

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

Energy Work & Power

Act 14B p.158-160 Energy
Ex 4J p.143-147 Energy Work & Power

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

Sunday, 7 April 2024

Week 11 Term 1 2024 Momentum and Impulse

Homework

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

Vectors

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

Forces

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

Circular Motiuon

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

Springs

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

Energy Work & Power

Act 14B p.158-160 Energy
Ex 4J p.143-147 Energy Work & Power

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)

Impulse

Impulse examples///Homemade Science with Bruce Yeany

Momentum

Impulse

Sunday, 17 March 2024

Week 8 Term 1 2024 Energy Work Power

Homework

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

Vectors

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

Forces

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

Circular Motiuon

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

Springs

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

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-²in 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

Sunday, 10 March 2024

Week 7 Term 1 2024

Homework

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

Vectors

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

Forces

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

Circular Motiuon

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

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?

Sunday, 3 March 2024

Week 6 Term 1 2024

Homework

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

Vectors

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

Forces

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

Circular Motiuon

Act 13A p.148-149 Circular Motion
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.