Term 2 Week 8 2018

Homework

• Ex 5A, p. 151-155, Models of the Atom
• Ex 5B, p. 160-171, Radioactivity
• Ex 5C, p. 175-182, Nuclear Reactions

Revision for the Atomic & Nuclear Assessment next week

Atomic and Nuclear Pre-Aligned Exams AS 90253

(Scroll to the bottom of this page - link)

The pre-aligned Standard Covering:

1. Historical models of the Atom;
2. Half-Life;
3. but not Nuclear Reactions

Term 2 Week 7 2018

Homework

• Ex 5A, p. 151-155, Models of the Atom
• Ex 5B, p. 160-171, Radioactivity
• Ex 5C, p. 175-182, Nuclear Reactions

Nuclear Reactions:

• Conservation of Atomic Number
• Conservation of Nucleon Number
• Conservation of Mass-Energy E = Δmc2

E = Δmc2

Nuclear Fusion in the Sun

Binding Energy comes from the change in mass from individual nucleons to being combined into a nucleus. This is energy lost by the nucleons joined together in a nucleus and must be returned in order to separate the nucleons

E = Δmc2

Mass Energy Equivalence

Nuclear Reactions

Fission Fusion and Radioactive Decay

Fission & Fusion

Term 2 Week 6 2018

Homework:

• Ex 5A, p.151-155, Models of the Atom
• Ex 5B, p. 160-171, Half-Life

Rutherford'd Den and Canterbury University Field Trip

Term 2 Week 5 2018

Homework:

• Ex 4G, p. 125-130, Torque, Static Moments
• Ex 5A, p.151-155, Models of the Atom
• Ex 5B, p. 160-171, Half-Life

Alpha, Beta, Gamma Ionising Radiation

• Ionising Radiation is radiation that will give a charge to matter. This includes EM radiation (photons) that have enough energy to ionise - e.g. X-Rays and 𝜸 - Rays. This also includes charged particles such as α and 𝞫 particles.

Ionising Radiation

Types of Radiation Alpha, Beta, Gamma

Radiation vs Radioactive Atoms

Is Radiation Dangerous?

Radioactivity: Expect the unexpected

EM Spectrum

Term 2 Week 5 2018

Homework:

• Ex 4G, p. 125-130, Torque, Static Moments
• Ex 5A, p.151-155, Models of the Atom

Models of the Atom

Models of the Atom Timeline

Discovery of the Electron: Cathode Ray Tube Experiment

Discovery of the Nucleus: Rutherford's Gold Foil Experiment

Charge of an Electron: Millikan's Oil Drop Experiment

Atomic Structure: Discovery of the Neutron

Term 2 Week 3 2018

Homework:

• Ex 4J, p. 143-147 Energy, Work, Power
• Ex 4I, p.137-141, Springs
• Ex 4G, p. 125-130, Torque, Static Moments

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

Term 2 Week 2 2018

Homework:

• Ex 4J, p. 143-147 Energy, Work, Power
• Ex 4I, p.137-141, Springs

PhET - Hooke's Law & Springs - HTML

Intro to Springs and Hooke's Law

Potential Energy Stored in a Spring

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