PHYC10003 Physics 1 – Semester 2: Introduction and Classical Mechanics Overview

Introduction to PHYC10003 Physics 1

Course Overview

This course introduces first-year university students to the foundational concepts of physics, focusing on classical mechanics and its historical development. The lectures are divided between two professors, covering topics from kinematics to special relativity.

• Lectures 1-18: Kinematics, position, velocity, acceleration, Newton's laws, dynamics, forces, friction, energy, rotational motion, and systems of particles.

• Lectures 19-36: Action, energy, oscillations, waves, optics, relativity, and more advanced topics.

• Course Staff: Includes lecturers, director of first-year studies, lab coordinator, and tutorial team.

Learning Outcomes

• Understand the lecturer's research activities and background.

• Learn about the staff-student liaison committee and course organization.

• Recognize special symbols used in lecture slides.

• Preview the scope of physics and classical physics topics covered in the semester.

Big Picture Ideas in Physics

Historical Context: Newton, Galileo, and the Development of Physics

Physics has evolved through the contributions of great scientists such as Isaac Newton and Galileo Galilei. Their work laid the foundation for classical mechanics and the scientific method.

• Universities and Science in Crisis: The Great Plague of 1665–1666 led to university closures and forced scientists like Newton to work from home, resulting in significant scientific breakthroughs.

• Newton's Productivity: During isolation, Newton developed many of his most influential laws and theories.

Newton's Laws of Motion

Fundamental Principles of Classical Mechanics

Newton's laws form the basis of classical mechanics, describing the relationship between forces and motion.

• Newton's First Law (Law of Inertia): A body remains at rest or in uniform motion unless acted upon by an external force.

  • Implication: Laws of physics are independent of reference frame.

  • Related concepts: Galilean and Special Relativity.

• Newton's Second Law: The acceleration of an object is proportional to the net force acting on it and inversely proportional to its mass.

  • Mathematical form:

  $\vec{F} = m\vec{a}$

  • Equivalence Principle, Lagrangian and Hamiltonian Mechanics.

• Newton's Third Law: For every action, there is an equal and opposite reaction.

  • Implication: No absolute reference frames.

Example: Perseverance Rover Landing on Mars

The application of Newton's laws is illustrated by the successful landing of the Perseverance rover on Mars in 2021, which required precise calculations of force, acceleration, and trajectory.

• Universal Gravitation: Newton's law of gravitation was essential for calculating the rover's descent.

• Equation:

$F = G\frac{m_1 m_2}{r^2}$

Key Terms and Concepts

Definitions

• Kinematics: The study of motion without considering its causes.

• Dynamics: The study of forces and their effect on motion.

• Force: An interaction that changes the motion of an object.

• Acceleration: The rate of change of velocity.

• Reference Frame: A coordinate system used to describe motion.

Applications

• Space exploration (e.g., Mars rover landing)

• Engineering and technology

• Everyday phenomena (e.g., motion of vehicles, sports)

Summary Table: Newton's Laws of Motion

Law	Description	Equation	Key Implication
First Law	Inertia: Objects remain at rest or in uniform motion unless acted upon by a force	N/A	Reference frames, relativity
Second Law	Force causes acceleration proportional to mass	$\vec{F} = m\vec{a}$	Quantitative prediction of motion
Third Law	Every action has an equal and opposite reaction	N/A	Interactions, conservation of momentum

Additional Info

• Special relativity and advanced mechanics will be covered in later lectures.

• Historical context helps illustrate the development and application of physical laws.