Phys101 lecture recording on 25 February 2025 at 09.50 AM

Email Protocols

• Confidential Emails:

  • Do not send any emails that are confidential or ethical issues to the instructor.

  • All confidential emails should be sent directly to Physics 101.

  • If not marked as confidential, emails will be forwarded to Physics 101 and may not be answered directly.

Tutorial and Homework Requirements

• Previous Tutorials:

  • Students participated in tutorials and completed homework questions.

  • Invitation to fill in responses correctly; previously, 20% neglected to fill in the correct boxes, risking their marks.

• Marking Procedures:

  • Homework will be marked by humans unless all students fill in required information properly, which might then integrate technology (e.g., Gradescope).

• Homework Awareness:

  • It's crucial for students to do their homework before the lectures, despite misunderstandings.

  • Failure to do so will result in zeros for that component of the tutorial.

Classroom Dynamics and Instruction

• Class Engagement:

  • Emphasis on the importance of time management and awareness regarding the classroom clock.

  • Students were encouraged to stand and engage with classroom activities for better participation.

Physics Concepts Covered

• Applied Force vs. Friction:

  • Understanding scenarios where the applied force is less than the kinetic friction, exploring relevant true statements regarding movement and forces.

  • Focus on the relationship between applied force, friction, and work done.

• Positive and Negative Work:

  • Work is defined as positive when the displacement acts in the same direction as the force.

  • Work is considered zero when displacement occurs without force, particularly perpendicular dispositions.

• Work Calculation:

  • Work is calculated as the dot product of force and displacement vectors:

    • [ Work = F \cdot d = |F| |d| \cos(\theta) ]

  • Understanding how to visualize work done through angle parameters.

Problem-Solving Strategy

• S.P.O.C.K. Method:

  • Sketch: Visual representation of the problem.

  • Point Out: Identify relevant details provided in a problem.

  • Communicate: Discuss the concepts involved.

  • Key Concepts: Note key equations and principles.

  • Solve: Execute calculations based on the equation established.

Energy, Forces, and Motion

• Energy Definitions:

  • Energy is central to all physical processes, emphasizing energy transformations as critical to understanding motion.

• Force Work Concepts:

  • Discussed concepts of kinetic energy and potential energy as applied in various physics problems.

  • Integration of forces over varying displacements for understanding work done.

Class Expectations and Resources

• Class Structure:

  • Optional drop-in support sessions offered for additional help and problem clarification.

  • Emphasis on developing personalized cheat sheets as study aids rather than relying on formulas.

  • Students should regularly review lecture summaries to prepare for tests.

Example Problem from Class

• Floating Ice Block Displacement Work:

  • Context of applying a force (210 N in the I direction, -50 N in the J) to determine work done over a given displacement.

  • Calculation process outlined:

    • Work = Dot product of force and displacement vectors leading to the conclusion of total work being 4,950 joules.

Practical Classroom Activities

• Hands-On Examples:

  • Classroom demonstrated with volunteers to highlight concepts surrounding work and motion (e.g., holding objects while observing forces).

  • Interactive activities designed to enhance understanding of physics concepts in a tangible manner.