Week 7 Term 1 2025 Energy

 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

Graphing Exercises (do these on the spreadsheet)

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

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