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Teaching & Academics Science Physics

Physics 100: Torque and Equilibrium of Rigid Bodies

Comprehensive course covering the topics of torque, equilibrium and center of mass and stability.
Rating: 4.3 out of 54.3 (24 ratings)
231 students
Created by Eric Meloche, Ph.D.
Last updated 12/2017
English
English [Auto]
30-Day Money-Back Guarantee

What you'll learn

  • How to calculate torque, center of mass, and solve equilibrium problems

Requirements

  • Basic understanding of Forces, Vectors, and Newton's Laws

Description

This course covers torque, center of mass, rigid bodies in equilibrium, and the stability of objects.   The course is a mix of lectures and problem solving tutorials.   Students will learn to how to calculate torque, how to evaluate the center of mass of systems of particles and objects with uniform density.    I will teach you how to approach problems and help you develop your own problem solving strategies to become a better problem solver.    

Part 1: Torque

  • What is torque?
  • Understand how torque is different from forces
  • Calculate torque using 3 different techniques (standard methods, force components, and moment arms)
  • Several example problems to practice

Part 2: Center of Mass

  • Learn how to find the center of mass of symmetric objects
  • Calculating the center of mass of systems of particles in 1D, 2D, and 3D.
  • Practice problems

Part 3: Static Equilibrium

  • Conditions for Static Equilibrium
  • Problem solving strategies
  • Picking the right pivot location
  • Several example problems to practice the problem solving techniques.

Part 4:  Various Problem Section

  • Practice solving Torque and center of mass problems and compare your answers to those of Physics Ninja
  • Section contains conceptual questions and algebraic questions ranging from easy to very challenging.

If at any point you don't understand something in my videos please feel free to reach out.  I'm always willing to help someone learn.  Physics Ninja always has your back!

Happy Learning

Dr. E., Physics Ninja and Expert Physics and Math Teacher.

   

Who this course is for:

  • AP physics students, first year undergraduate physics, MCAT physics prep and anyone
  • Students studying for physics exams

Course content

6 sections • 52 lectures • 5h 5m total length

  • Preview01:00

  • Preview03:46
  • Preview02:43
  • Torque: Magnitude and Direction
    06:04
  • Calculating the Net Torque
    05:17
  • General Definition of Torque: Part 1
    03:11
  • General Definition of Torque: Part 2
    01:34
  • Understanding Sin(theta)
    02:31
  • Example Problem: Comparing Torques
    06:37
  • Example Problem: Swinging Door
    04:47

  • Introduction: Center of Mass
    02:37
  • Where is the Center of Mass?
    02:10
  • Preview03:26
  • Example: Calculate the position of the center of mass
    03:49
  • Example 2: Center of mass of sphere and rod system
    04:04
  • Center of Mass in 2 and 3 Dimensions
    02:44
  • Example: Masses on an Equilateral Triangle
    05:27
  • Example Problem: Rectangular Metal Frame
    08:48

  • Preview03:02
  • Examples of Static Equilibrium
    01:54
  • Example: Concept Check
    03:06
  • Example Problem: Seesaw Father and Daughter
    06:24
  • Choice of pivot point
    02:14
  • Center of Gravity
    03:25
  • Center of Gravity (cont)
    03:05
  • Example: Torque on a Ladder due to Gravity
    04:05
  • Preview03:31
  • Preview03:48
  • Example Problem: Ladder Against a Wall
    00:57
  • Example Problem Solution: Ladder Against a Wall
    09:28
  • Example: Student Center of Mass Problem
    03:29
  • Example Problem: Tension in the Spring Scale
    04:43
  • Example: Three Spoke Wheel
    04:09
  • Example: Horizontal Beam Problem
    10:49

  • Introduction to Stability
    02:48
  • Stability and Torque due to Gravity
    02:32
  • Examples of Stable and Unstable Equilibrium
    03:07
  • Book on a table: Stable or Unstable?
    02:22

  • Problem 1: Finding the net torque
    03:33
  • Problem 2: Comparing torques
    02:49
  • Problem 3: Center of Mass of Rectangle with Missing Piece
    18:39
  • Problem 4: Torque and the square
    06:05
  • Problem 5a: Finding Tension and Reaction Forces
    10:57
  • Problem 5b: Finding Tension and Reaction Forces
    11:39
  • Problem 6: Physics Ninja Walking on a Beam
    20:05
  • Problem 7: Reaction Forces of Beam against a Wall
    08:40
  • Problem 8: Claw Hammer Pulling a Nail
    05:04
  • Preview12:37
  • Problem 10: The Book Stacking Problem
    19:27
  • Problem 11: Forces Acting on 2 Marbles in a Jar
    16:07
  • Problem 12: Designing of a Decorative Mobile
    07:58
  • Problem 13: Center of Mass of a Square Plate with a Cut Out
    12:39

Instructor

Eric Meloche, Ph.D.
Physics Ninja and College Professor
Eric Meloche, Ph.D.
  • 4.6 Instructor Rating
  • 235 Reviews
  • 1,320 Students
  • 8 Courses

My name is Dr. E.     I'm a physicist and I love teaching math and physics.   I obtained my Ph.D. in physics and have been teaching physics now for over 15 years.    I currently work as an engineer in mobile consumer electronics and am an adjunct physics faculty at Harper College in Chicago.     I previously taught physics for the Princeton Review with a focus on MCAT physics and also trained new physics teachers.      Visit my website to learn more about me. 

I created these courses to make quality education more affordable.  I tutor a lot of students and i know how expensive it can be to find a great, reliable tutor.   All of my classes are a mix of lectures, where i review the basic theory and go over key concepts, and tutorials, where i show you how to solve problems and help you develop your own problem solving strategies.    The classes contain several example problems for each topic and at the end i typically put together a series of problems ranging in difficulty for you to practice on your own.    After you've tried to solve the problems on your own, come watch the videos and see how a Physics Ninja would solve the problem.     

All of my courses are comprehensive which means they tend to be longer than other courses.  I don't believe you can really learn physics with a 5-hour course covering a semesters worth of physics.   To learn physics, you have to practice solving problems, all types of problems, conceptual and algebraic.    

I'm committed to all of my students and reply to all emails and questions within 24 hours.  

Happy learning!

Dr. E.

Physics Ninja

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