Monday, 1 May 2023

Week 2 Term 2 2023

Homework

Act 8B Graphs of motion p.101
Act 8C Kinematics p.102
Ex 4E Kinematics p.115-117
Act 12B Projectile Motion p.140-141
Ex 4F Projectile Motion p.119-124
Act 9A Vectors p.108-109
Ex 4A Vectors p. 90-94
Act 10A Forces p.117-118
Act 10B Forces p.123-124
Ex 4B Forces p.97-104
Act 13A p.148-149 Circular Motion
Ex 4H p.132-134 Circular Motion
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
Act 14B, p. 158-160 Combined Mechanics
Ex 4J, p. 143-147 Energy, Work, Power
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

Monday, 20 March 2023

Week 8 Term 1 2023

Homework

Act 8B Graphs of motion p.101
Act 8C Kinematics p.102
Ex 4E Kinematics p.115-117
Act 12B Projectile Motion p.140-141
Ex 4F Projectile Motion p.119-124
Act 9A Vectors p.108-109
Ex 4A Vectors p. 90-94
Act 10A Forces p.117-118
Act 10B Forces p.123-124
Ex 4B Forces p.97-104
Act 13A p.148-149 Circular Motion
Ex 4H p.132-134 Circular Motion
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
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, 12 March 2023

Week 7 Term 1 2023

Homework

Act 8B Graphs of motion p.101
Act 8C Kinematics p.102
Ex 4E Kinematics p.115-117
Act 12B Projectile Motion p.140-141
Ex 4F Projectile Motion p.119-124
Act 9A Vectors p.108-109
Ex 4A Vectors p. 90-94
Act 10A Forces p.117-118
Act 10B Forces p.123-124
Ex 4B Forces p.97-104
Act 13A p.148-149 Circular Motion
Ex 4H p.132-134 Circular Motion
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)

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

Sunday, 5 March 2023

Week 6 Term 1 2023

Homework

Act 8B Graphs of motion p.101
Act 8C Kinematics p.102
Ex 4E Kinematics p.115-117
Act 12B Projectile Motion p.140-141
Ex 4F Projectile Motion p.119-124
Act 9A Vectors p.108-109
Ex 4A Vectors p. 90-94
Act 10A Forces p.117-118
Act 10B Forces p.123-124
Ex 4B Forces p.97-104
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.