Circular Motion - Physics - Gravity Course (Class 4)

What You Will Learn?

• Circular Motion principles appear in many areas of Physics: for example in mechanics, Atomic Physics, magnetism, particle physics , gravitation etc… This is why it is essential to understand this concept well..
• By taking this class, you will gain an understanding of all the fundamentals related to circular motion. This knowledge will allow you to solve many problems in physics: Using the mathematical consequences of a motion which is circular allows to derive many useful relations between quantities, and in the end, easily solve problems that otherwise would appear very difficult..
• In videos 1 through 4, we discuss the various quantities to consider when dealing with a system in circular motion: angles, angular velocity, centripetal acceleration and centripetal force. We also lay down proofs of the relations between these quantities..
• Video 5 is an application example: we use principles of circular motion to determine the kinetic energy of an electron in orbit around a proton (a hydrogen atom)..
• In Video 6 through 9, it is your turn: each video presents an exercise for you to work on, followed by a detailed correction on the board.  Videos 6 and 7 are straight forward applications of the formulas. Video 8 requires a little more reflection, and video 9 is challenging.  .
• ***********************Content of the class.
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• Video 4.1: Introduction + Lesson - What is an angle?.
• Video 4.2: Lesson - Angular Velocity.
• Video 4.3: Lesson - Centripetal Acceleration.
• Video 4.4: Lesson - Centripetal Force.
• Video 4.5: Application example: The kinetic energy of the electron in a hydrogen atom.
• Video 4.6: Training Exercise 1 (Easy).
• Video 4.7: Training Exercise 2 (Easy).
• Video 4.8: Training Exercise 3 (moderate difficulty).
• Video 4.9: Training Exercise 3 (challenging).
•  All 4 training exercises are provided as pdf files and formatted so that you can print the exercise and work on them away from the computer. Answers are provided also in a pdf document..
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• **************************************************************************This class is part of a larger course named “Gravity, The Basics”..
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• “Gravity, The Basics” explores the elementary notions of Newtonian gravity..
• Class 1: “Linear Motion” (because being comfortable with this notion will allow you to make the most of the full course). This class presents a step-by-step technique to solve all motion problems when the acceleration is constant. This class can be taken by itself..
• Class 2: “Newton’s Universal Law of Gravitation”, which you can be seen as a doorway to the deeper dive we carry out in the next classes..
• Class 3: “Gravitational Fields”, the core of this course: This class teaches first what is a field, and then dives into a deep description of gravitational fields, gravitational field strength and gravitational field lines. It is packed with many exercises aimed at making the student comfortable with these notions..
• Class 4: “Circular Motion”, prepares you for the section on orbital motion. You are presented with a detailed explanation of fundamental quantities that occur in circular motion (angles, angular velocity, centripetal acceleration and forces). This class can be taken by itself..
• Class 5: “Orbital Motion”, for you  to master the motion of planets around their star: This class blends notions taught in class 3 (gravitational fields) with notions presented in class 4 (circular motion), in order to get a good grasp of what is an orbit, and how to manipulate easily orbital motion concepts..
• Class 6: “Wrapping-up and Gravity Quiz”. Once you have viewed all 5 classes, it’s time for the exam! After a 5-minute summary of all notions presented in “Gravity, The Basics”, 12 exam-like questions are presented and corrected in detail..
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• ***********************Level of this class.
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• This class is suited for end high school and entry level University students taking Physics. Any person interested in Physics and in need of a refresher about circular motion will also enjoy this class..