Term 1 Week 7 2022

  Homework

• Act 8B Graphs of motion p.101 (last week)
• Act 8C Kinematics p.102 (last week)
• Ex 4E Kinematics p.115-117 (last week)
• Act 9A Vectors p.108-109 (last week)
• Ex 4A Vectors p.90-94 (last week)
• Act 12B Projectiles p.140-144 (last week)
• Ex 4F Projectiles p.119-124 (last week)
• Act 10A p.117-118 Forces (last week)
• Act 10B p.123-124 Forces (last week)
• Ex 4B p.97-104 Forces (last week)
• Ex 4G p.125-130 Torque (last week)
• Act 13A p.148-149 Circular Motion (last week)
• Ex 4H p.132-134 Circular Motion (last week)
• Ex 2B, p.16-18, Graphing
• Ex 2C, p.19-25, Identifying Relationships and Experimental Equations
• Act 14A, Energy and Springs
• Act 14B, 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

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