Lecture 1 - Mechanics: 1D Kinematics

  • Welcome to the Lectures

    • Introduction by Kwang Tong Thut, lecturer for Physical Modeling and Physics I.

  • Webinar Setup

    • Acknowledging the large class size (over 1000 students) and utilizing a webinar format.

    • Explanation of chat functionality being disabled.

    • Encouraging students to raise hands for questions and clarifications during the session.

  • Course Structure

    • Course covers both physics theory and practical applications through lab work.

    • Lecture recordings will be available on Canvas post-lecture, maintaining same content as live sessions but missing live interactions.

  • Lecture Content Overview

    • First topic: Kinematics in One Dimension

    • Building blocks: displacement, velocity, and acceleration are primary quantities for describing motion.

    • Introduction to acceleration due to gravity (g = 9.8 m/s²) and Newton's laws of motion.

  • Learning Materials

    • Lecture slides and worked example documents available on Canvas.

    • Emphasizing practice problem-solving opportunities in planned workshops following lectures.

  • Importance of Physics Modeling

    • Physics relies heavily on models to explain natural phenomena, starting from simple models and adding complexity as required.

    • Examples: Motion in one dimension involves understanding the relationships between displacement, velocity, and acceleration.

  • Key Concepts

    • Displacement (Δx): Change in position of an object: Δx = x_f - x_i (vector quantity)

      • Positive and negative displacement based on direction of movement.

    • Velocity (v): Average velocity as Δx/Δt where Δx is displacement over a time interval.

    • Speed (s): Scalar quantity, calculated as distance traveled over time (s = d/t), differs from vector velocity as it does not consider direction.

  • Calculus Application in Motion

    • Derivatives and their role in understanding instantaneous velocity.

    • Integrals will relate to recovering position from velocity or velocity from acceleration.

  • Integration Example

    • General equations derived from calculus:

      • Velocity: v(t) = v_initial + ∫(a(t) dt)

      • Position: x(t) = x_initial + ∫(v(t) dt)

  • Practical Example

    • Analyzing position function of an object moving in one dimension to derive expressions for velocity and acceleration.

  • Free Body Diagrams

    • Method to visualize forces acting on an object.

    • Tension and weight provide understanding of dynamics of objects (e.g., lifting, applying forces).

  • Addressing Student Questions

    • Clarifying queries about workshop participation, assessments, and available resources including U Pass and writing assignments on Canvas.

    • Emphasized that in physics assessment, problem-solving will contribute to final marks.

  • Conclusion

    • Encouragement to participate in workshops and utilize resources available through UTS for assistance.

    • Reminder: follow-up email for any unanswered queries to the instructor or course coordinator post-lecture.