I Made A Physics Problem Harder @zhelyo

Uploaded February 2025 | Updated September 2026, 3 weeks ago

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In today's video we will make a question from A Level Physics on the gravitational potential harder. We will answer what is the minimum speed to throw an object from Earth so that it reaches the Moon by calculating the maximum gravitational potential between the earth and the moon by differentiating and finding an extremum. This is an excellent calculus based physics problem. It can also be used for Physics Olympiad Preparation.

The unmodified question is from Edexcel Physics 2020 Paper 2. Please note that this is not an official solution and my reasoning may be wrong and I am not affiliated with the exam board.
The paper can be found here:
qualifications.pearson.com/content/dam/pdf/A-Level/Physics/2015/Exam-materials/9PH0_02_que_20201016.pdf
(Question 16 b)

This question is excellent challenge for Edexcel Paper 2, and also for AQA A Level Physics Paper 2, OCR A Level Physics Paper 1 and in general for gravitational fields and astrophysics topic.

It can also be used for similar exam boards such as the CIE syllabus, IB Physics, AP Physics etc.

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$ALL of OCR Waves in 90 Minutes | A Level Physics My Physics Tutoring: https://zphysicslessons.net/physics-tutoring Extra Help videos: https://www.youtube.com/channel/UC3L5MO3gJTlB09wmmHGW5Qg/join In this video we cover the whole of Module 4 Waves Portion of the OCR A Level Physics Specification. Please note that any solutions to problems or general explanations are not official and you should see all exam problems and official mark schemes on the OCR A Level Physics website: https://www.ocr.org.uk/qualifications/as-and-a-level/physics-a-h156-h556-from-2015/ Stationary Wave Formation: Chapters: 00:00 Progressive, Transverse and Longitudinal Waves 00:51 Wave Properties 02:03 Phase Difference 03:13 Phase Difference Example 1 04:33 Phase Difference Practice Questions 07:54 Oscilloscopes 09:13 Oscilloscopes Practice Questions 11:33 Oscilloscope to determine frequency 12:48 Wave Equation Derivation 13:48 Transverse Waves Graphical Representation 14:16 Longitudinal Waves Graphical Representation 16:57 Refraction, Reflection and Diffraction 17:41 Ripple Tank Example Question 19:48 Intensity 22:36 Intensity and Amplitude Practice Problems 27:36 Polarisation and Microwaves 28:42 Properties of Electromagnetic Waves 31:13 Polarisation of EM waves 33:22 Polarisation Practice Questions 35:14 Refractive Index and Refraction 38:15 Snells Law 38:56 Refraction Practice Questions 42:26 Refraction Experiment 45:04 Critical Angle and Total Internal Reflection 48:37 Critical Angle Practice Questions 55:11 Superposition 56:08 Coherence 56:47 Path Difference 57:54 Conditions for Constructive and Destructive Interference 58:57 Path Difference Practice Questions 01:02:07 Youngs Double Slit Experiment 01:03:34 Proof of Youngs Double Slit Equation 01:06:02 Youngs Double Slit Practice Question 01:08:44 Experiment to determine the wavelength of light 01:10:46 Stationary Waves 01:11:22 Animation of Stationary Waves Formation 01:12:45 Phase Difference in Stationary Waves 01:13:52 Stationary Wave Practice 01:15:48 Similarities and Differences 01:17:34 Harmonics in a string stationary wave 01:20:21 Harmonics Example Problem 01:22:45 Stationary Waves in Air Columns 01:26:04 Air Columns Practice Problems 01:27:19 Experiment to determine the speed of sound$

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