Grade 12 Physical Sciences May 2026 Practice Assignment | Mechanics & Doppler Effect | NSC | Part 1

Welcome back to the channel! In this video, we provide complete, step-by-step solutions for the official May 2026 Grade 12 Physical Sciences (Physics) Practice Assignment.Whether you are revising for your upcoming term tests or working through this specific exemplar, we break down the fundamental physics laws, structural free-body diagrams, and algebraic steps to help you secure full marks! NEED EXTRA HELP WITH GRADE 12 MATHS OR PHYSICAL SCIENCES?Get personalized, expert support with iCampSA! We offer high-quality online lessons and interactive tutor-led support groups designed specifically to help Grade 10, 11, and 12 learners master the CAPS and IEB curriculum, ace their assessments, and crush their final NSC matric exams. Join iCampSA today: www.icampsa.co.za What we cover in this video: • Question 2: Work, Energy, and Power – Drawing a free-body diagram for a vehicle moving up an inclined hill at a constant velocity, solving for kinetic friction, and applying the Work-Energy Theorem (W_{net} = \Delta E_k) alongside P = F \cdot v to determine the average power of the car's engine. • Question 3: Vertical Mechanics & Work-Energy – Analyzing a hovering helicopter lifting a 1680 kg loaded bucket vertically upwards at a constant speed, stating the Work-Energy theorem, and setting up the net work equation containing Tension, Gravity, and Air Friction (W_T + W_{fk} + W_{fg} = 0) to compute the work done by air resistance. • Question 4: The Doppler Effect & Sound – Defining the Doppler effect in words, calculating wave frequency from wavelength (v = f\lambda), establishing directional motion (towards vs. away), setting up the algebraic formula to determine source velocity (v_s), and converting units to check if a driver is breaking the 100 km/h speed limit. Use the chapters or timestamps below to navigate through this lesson: 00:00:01 - Introduction & Grade 12 June Exemplar Paper Overview 00:00:22 - Question 2: Incline Plane Mechanics (Car Constant Velocity Analysis) 00:00:54 - Question 2.1: Defining Power in Words (Exam Prescribed Definition) 00:01:32 - Question 2.2: Drawing a 4-Mark Labeled Free-Body Diagram for an Incline Plane 00:03:22 - Question 2.3: Calculating Magnitude of Kinetic Frictional Force (Fk = mu x N) 00:07:42 - Question 2.4: Applying the Work-Energy Theorem for Constant Velocity Networks (Wnet = delta EK) 00:11:19 - Question 2.4: Resolving Trigonometric Displacements via Right-Angled Incline Scales 00:13:40 - Question 2.4: Calculating Non-Zero Work Components for Opposing Vector Angles 00:21:40 - Question 2.4: Determining Engine Power Output using the Equation P = F x v 00:22:50 - Question 3: Vertical Work and Non-Isolated Systems (Helicopter Bucket lifting) 00:23:44 - Question 3.1: Stating the Work-Energy Theorem in Words 00:25:16 - Question 3.2: Drawing a Free-Body Diagram Accounting for Vertical Air Friction 00:27:00 - Question 3.3: Calculating Air Friction Work with Non-Zero Force Distributions 00:33:42 - Question 4: Doppler Effect Theory and Traffic Speed Enforcement Calculations 00:34:36 - Question 4.1: Stating the Doppler Effect in Words 00:35:16 - Question 4.2: Calculating Sound Frequency via Wave Equation Relationships (v = f x lambda) 00:36:37 - Question 4.3: Analyzing Frequency Shifts to Determine Direction of Source Motion 00:38:08 - Question 4.4: Using Doppler Equations to Calculate Source Speed and Speed Limit Violations 00:41:54 - Question 4.4: Converting Velocity Units from m/s to km/h Using the 3.6 Scaling Constant 00:42:53 - Question 4.5: Qualitative Doppler Shifts for Varying Constant Velocity Parameters Make sure to grab your scientific calculator, your official physics formula sheet, a notebook, and a pen. If this comprehensive breakdown helps clarify your physics revision, please hit the LIKE button, SUBSCRIBE to support the channel, and share this with your fellow matric classmates! #Grade12PhysicalSciences #MatricPhysics #DopplerEffect #WorkEnergyAndPower #NSCPhysicalSciences #iCampSA #Matric2026