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📚 Welcome to NEET 2025 Daily Live Classes!
Join us every day for in-depth live sessions covering Physics, Chemistry, and Biology as we prepare together for the NEET 2025 exam. Whether you’re just starting your preparation or looking for revision, our expert faculty has you covered!

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Lesson 15 (Angular Momentum) of Dianna's Intro Physics Class on Physics Girl. Never taken physics before? Want to learn the basics of physics? Need a review of AP Physics concepts before the exam? This course is for you!

More fun exploration of water spinning angular momentum demo from Steve Mould and Smarter Every Day: https://www.youtube.com/watch?v=M4-L8UgPkOk

Exercises in this video:
1. A box and a sphere are sliding and rolling, respectively, down a ramp. If they start from the same height, and we ignore friction on the box, which will reach the ground first?
What if it were a full soda can and an empty soda can?

2. A sphere of mass 4kg rolls down a ramp, starting with a height of 5 meters from the ground. How fast is the sphere rolling when it gets to the ground?

3. If every person on Earth ran around the equator in the same direction, what would their total angular momentum be? Use 65 kg as the average mass of the 7.8 billion people on Earth, and let them run at 5m/s.

4. Given 8 x 10³⁷ kg•m² as the Moment of Inertia of Earth, by how much would all those people running change the angular speed of the Earth?

Special thanks to Kari Byron for her wonderful shoutout at the end of the video! You can follow her on Twitter @KariByron and Instagram @therealkaribyron.

Credits:
Dianna Cowern - Executive Producer/Host/Writer
Jeff Brock - Lead Writer/Course Designer
Laura Chernikoff - Producer
Kaitlyn Today - Video Editor
Sophia Chen - Researcher/Writer
Erika K. Carlson - Researcher/Writer
Hope Butner - Production Assistant
Levi Butner - Videographer
Lauren Ivy - Set Design
Vanessa Hill - Consulting Producer
Aleeza McCant - Illustrator
Rachel Allen - Illustrator
Consultant - Kyle Kitzmiller
Lucy Brock, Samantha Ward - Curriculum Consultants
Cathy Cowern - Transcription

AP Physics 1 - 2020 Exam Sample Questions Full Solution
Link To Question
https://apcentral.collegeboard.....org/pdf/ap-2020exam

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A small sphere of mass M is suspended by a string of length L. The sphere is made to move in a horizontal circle of radius R at a constant speed, as shown above. The center of the circle is labeled point C, and the string makes angle θ0 with the vertical

Two students are discussing the motion of the sphere and make the following statements.
Student 1: None of the forces exerted on the sphere are in the direction of point C, the center of the circular path. Therefore, I don’t see how there can be a centripetal force exerted on the sphere to make it move in a circle.

Student 2: I see another problem. The tension force exerted by the string is at an angle from the vertical. Therefore, its vertical component must be less than the weight Mg of the sphere. That means the net force on the sphere has a downward vertical component, and the sphere should move downward as well as moving around in a circle.

(a) What is one aspect of Student 1’s reasoning that is incorrect? Explain why.
(b) What is one aspect of Student 2’s reasoning that is incorrect? Explain why.

Student 3 correctly derives two equations to relate the tension force FT to the net force Fnet and the other quantities.
(c) Explain how one of the equations can be used to challenge Student 1’s claim.
(d) Explain how one of the equations can be used to challenge Student 2’s claim.

The students observe that the radius R increases as the speed v of the sphere increases. Together, they derive the equation R = v L/g to calculate the radius of the circle R followed by the sphere if its speed is v.
(e) Regardless of whether this equation is correct or incorrect, does it plausibly model the students’ observation about the relationship between R and v? Why or why not?
(f) This equation does not correctly model the relationship between R and v if v is very fast. Explain why.

Instead of moving in a horizontal circle, the sphere now moves in a vertical plane so that it is a simple pendulum, as shown above. The maximum angle θmax that the string makes from the vertical can be assumed to be small. The graph below shows data for the square of the pendulum period T as a function of string length L.

Explain how the above graph would change under each of the following circumstances. Justify your answers.
(g) The mass of the sphere is increased.
(h) The maximum angle θmax is decreased.
(i) The pendulum is taken to the Moon.



If there is a topic you want me to do leave them in the comments below.
#physicstutor #mathtutor

Lesson 14 (Rotation and Torque) of Dianna's Intro Physics Class on Physics Girl. Never taken physics before? Want to learn the basics of physics? Need an AP Physics 1 review before the exam? This course is for you!

Exercises in this video:
1. If you are standing on Earth’s equator (radius about 6380km), how fast are you going? What is your rotational velocity? What is your angular velocity?

2. A tiny cat, mass 0.50kg is clinging to the edge of a record spinning at 45rpm. If the radius of the record is 0.10m, what is the frictional force keeping that cat moving in a circle?

3. If Dianna, mass 60 kg, is standing on a scale on the equator, what does the scale actually read?

4. Dianna and Marie want to balance on a seesaw. But Marie has 3 times Dianna’s mass. How far away from Dianna should they move the fulcrum in order to balance the seesaw?

Special thanks to propulsion engineer Diana Alsindy for her awesome shoutout at the end of the video! You can follow her on Twitter @DianaAlsindy

Credits:
Dianna Cowern - Executive Producer/Host/Writer
Jeff Brock - Lead Writer/Course Designer
Laura Chernikoff - Producer
Rachel Watson - Video Editor
Sophia Chen - Researcher/Writer
Erika K. Carlson - Researcher/Writer
Hope Butner - Production Assistant
Levi Butner - Videographer
Lauren Ivy - Set Design
Vanessa Hill - Consulting Producer
Aleeza McCant - Illustrator
Rachel Allen - Illustrator
Consultant - Kyle Kitzmiller
Lucy Brock, Samantha Ward - Curriculum Consultants
Cathy Cowern - Transcription

ALL OF PHYSICS in 14 Minutes: https://youtu.be/ZAqIoDhornk

Everything is made of atoms. Chemistry is the study of how they interact, and is known to be confusing, difficult, complicated...let's learn General Chemistry in under 20 Minutes.

This is not ALL of Chemistry, as fields like "Organic Chemistry" deserve videos of their own. But, this is the foundation, or "General Chemistry", which contains most concepts you need to know to understand other topics and fields of Chemistry.

This is a summary and revision of around 4 years of Chemistry you learn in school, with maybe some university level concepts sprinkled in the mix.
This video is a good summary for preparing for exams and finals. Maybe. Perhaps.

Now go learn all of Chemistry. And share this with your friends who suck at Chemistry

Timestamps:
00:00 Intro
00:16 Valence Electrons
00:34 Periodic Table
01:24 Isotopes
01:34 Ions
01:47 How to read the Periodic Table
02:09 Molecules & Compounds
02:27 Molecular Formula & Isomers
02:53 Lewis-Dot-Structures
03:03 Why atoms bond
03:26 Covalent Bonds
03:37 Electronegativity
03:54 Ionic Bonds & Salts
04:25 Metallic Bonds
04:59 Polarity
05:37 Intermolecular Forces
05:51 Hydrogen Bonds
06:00 Van der Waals Forces
06:20 Solubility
06:46 Surfactants
07:00 Forces ranked by Strength
07:07 States of Matter
07:28 Temperature & Entropy
07:49 Melting Points
08:01 Plasma & Emission Spectrum
08:35 Mixtures
09:24 Types of Chemical Reactions
09:45 Stoichiometry & Balancing Equations
10:16 The Mole
10:46 Physical vs Chemical Change
11:05 Activation Energy & Catalysts
11:24 Reaction Energy & Enthalpy
11:42 Gibbs Free Energy
12:50 Chemical Equilibriums
13:15 Acid-Base Chemistry
13:41 Acidity, Basicity, pH & pOH
14:43 Neutralisation Reactions
14:56 Redox Reactions
15:18 Oxidation Numbers
16:01 Quantum Chemistry

Music by Audionautix.com

Courses on Khan Academy are always 100% free. Start practicing—and saving your progress—now: https://www.khanacademy.org/sc....ience/physics/one-di

Distance, displacement, speed and velocity. Difference between vectors and scalars. Created by Sal Khan.

Watch the next lesson: https://www.khanacademy.org/science/physics/one-dimensional-motion/displacement-velocity-time/v/calculating-average-velocity-or-speed?utm_source=YT&utm_medium=Desc&utm_campaign=physics

Missed the previous lesson? https://www.khanacademy.org/science/physics/one-dimensional-motion/displacement-velocity-time/v/introduction-to-physics?utm_source=YT&utm_medium=Desc&utm_campaign=physics

Physics on Khan Academy: Physics is the study of the basic principles that govern the physical world around us. We'll start by looking at motion itself. Then, we'll learn about forces, momentum, energy, and other concepts in lots of different physical situations. To get the most out of physics, you'll need a solid understanding of algebra and a basic understanding of trigonometry.

About Khan Academy: Khan Academy is a nonprofit with a mission to provide a free, world-class education for anyone, anywhere. We believe learners of all ages should have unlimited access to free educational content they can master at their own pace. We use intelligent software, deep data analytics and intuitive user interfaces to help students and teachers around the world. Our resources cover preschool through early college education, including math, biology, chemistry, physics, economics, finance, history, grammar and more. We offer free personalized SAT test prep in partnership with the test developer, the College Board. Khan Academy has been translated into dozens of languages, and 100 million people use our platform worldwide every year. For more information, visit www.khanacademy.org, join us on Facebook or follow us on Twitter at @khanacademy. And remember, you can learn anything.

For free. For everyone. Forever. #YouCanLearnAnything

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Professor Brian Cox of the University of Manchester presents an educational walk, through the fundamentals of Particle Physics.

Disclaimer: The copyright owner provides this content for educational purposes.

This is a review of all the topics on the AP Physics C Mechanics exam.

In this tutorial Fahad Sir discussed about various development of physical Science !

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Lesson 18 (Electric Charge and Light) of Dianna's Intro Physics Class on Physics Girl. Never taken physics before? Want to learn the basics of physics? Need a review of AP Physics concepts before the exam? This course is for you!

Exercises in this video:
1. How many electrons are in 1 Coulomb of charge? How many protons?

2. What is the electromagnetic force between an electron and a proton that are separated by 1nm?

3. To compare, what would the force of gravity between the proton and the electron be?

4. An electron is in a constant electric field with a strength of -4.4x10^5N/C. What force is being exerted on that electron by the field?

Credits:
Dianna Cowern - Executive Producer/Host/Writer
Jeff Brock - Lead Writer/Course Designer
Laura Chernikoff - Producer
Kaitlyn Ali - Video Editor
Bryn Bishop - AP Curriculum Consultant
Sophia Chen - Researcher/Writer
Erika K. Carlson - Researcher/Writer
Hope Butner - Production Assistant
Levi Butner - Videographer
Lauren Ivy - Set Design
Vanessa Hill - Consulting Producer
Aleeza McCant - Illustrator
Rachel Allen - Illustrator
Consultant - Kyle Kitzmiller
Lucy Brock, Samantha Ward - Curriculum Consultants
Cathy Cowern - Transcription