# APlusPhysics Forums

Showing files and videos posted in for the last 365 days.

1. Last week
2. ## 2 Masses on a Pulley - Conservation of Energy Demonstration

Example: Mass 1 and mass 2 hang from either side of a frictionless #pulley with #rotationalInertia, I, and radius, R. What is the angular acceleration of the pulley? Use #ConservationOfEnergy Want Lecture Notes? This is an AP Physics 1 Topic. Content Times: 0:07 The problem 1:01 Conservation of Energy 2:29 The mechanical energies 4:07 Solving the problem 5:57 Using arc length Multilingual? Please help translate Flipping Physics videos! Previous Video: 2 Masses on a Pulley - Torque Demonstration Please support me on Patreon! Thank you to Christopher Becke and Faiaz Rahman for being my Quality Control Team for this video.
3. ## 2 Masses on a Pulley - Torque Demonstration

Example: 0.100 kg and 0.200 kg masses hang from either side of a frictionless #Pulley with a rotational inertia of 0.0137 kg·m^2 and radius of 0.0385 m. (a) What is the #AngularAcceleration of the pulley? (b) What is the #TensionForce in each string? Want Lecture Notes? This is an AP Physics 1 Topic. Content Times: 0:08 The problem 1:29 The free body diagrams 2:51 Net torque on the pulley 4:28 Net forces on both masses 6:49 Tangentail acceleration 7:31 Solving for acceleration 8:55 Measuring acceleration 10:16 Solving for Tension 12:29 2 incorrect solutions Next Video: 2 Masses on a Pulley - Conservation of Energy Demonstration Multilingual? Please help translate Flipping Physics videos! Previous Video: Using Integrals to Derive Rotational Inertia of a Long, Thin Rod with Demonstration Please support me on Patreon! Thank you to Christopher Becke and Faiaz Rahman for being my Quality Control Team for this video.
4. Earlier
5. ## Using Integrals to Derive Rotational Inertia of a Long, Thin Rod with Demonstration

We use integrals to derive the #rotationalinertia of a uniform, long, thin rod. And we demonstrate our answer is correct using a Rotational Inertia Demonstrator. Want Lecture Notes? This is an AP Physics 😄 Mechanics Topic. Content Times: 0:15 Rotational Inertia 0:42 Linear Mass Density 1:51 About Center of Mass 3:02 About an End 4:27 Rotational Inertia Demonstrator (RID) 6:09 About Center of RID 7:03 Comparing our answers 7:43 Demonstrating our answer Next Video: 2 Masses on a Pulley - Torque Demonstration Multilingual? Please help translate Flipping Physics videos! Graphing the Rotational Inertia of an Irregular Shape Previous Video: How the Force of Tension on a Pulley Changes with Acceleration Please support me on Patreon! Thank you to Christopher Becke and Faiaz Rahman for being my Quality Control Team for this video.
6. ## How the Force of Tension on a Pulley Changes with Acceleration

We predict and measure the force of tension acting on a pulley while the system is at rest and accelerating. #PulleyTensionForce Want Lecture Notes? This is an AP Physics 1 Topic. Content Times: 0:20 The data 0:45 Review 1:15 Tension while at rest 2:45 Accelerating tension Next Video: Using Integrals to Derive Rotational Inertia of a Long, Thin Rod with Demonstration Multilingual? Please help translate Flipping Physics videos! Previous Video: Graphing the Rotational Inertia of an Irregular Shape Please support me on Patreon! Thank you to Christopher Becke and Faiaz Rahman for being my Quality Control Team for this video.
7. ## Graphing the Rotational Inertia of an Irregular Shape

We determine what data to collect to create a graph with rotational inertia as the slope of the best-fit line. #RotationalInertia - Then we collect the data and determine the rotational inertia of an irregular shape. Want Lecture Notes? This is an AP Physics 1 Topic. Content Times: 0:11 The problem 0:46 Free Body Diagram 1:31 Net Torque 3:01 Trial #1 3:52 Angular Acceleration 5:20 12 Trials and Graph 6:29 Deriving Units Next Video: How the Force of Tension on a Pulley Changes with Acceleration Multilingual? Please help translate Flipping Physics videos! Previous Video: Painter on a Scaffold - Don't Fall Off!! Please support me on Patreon! Thank you to Christopher Becke and Faiaz Rahman for being my Quality Control Team for this video.
8. ## Painter on a Scaffold - Don't Fall Off!!

Example: What is the closest to the end of a 93 g uniform meterstick you can place a 200.0 g object and have the system stay balanced? The meterstick is supported at the 20.0 cm and 80.0 cm marks. Want Lecture Notes? This is an AP Physics 1 Topic. Content Times: 0:03 A scaffold 0:33 The problem 1:28 Free body diagram 2:06 Net torque 3:34 Force Normal demo 4:28 Solving the problem 6:17 Testing our answer Next Video: Graphing the Rotational Inertia of an Irregular Shape Multilingual? Please help translate Flipping Physics videos! Previous Video: Placing the Fulcrum on a Seesaw Please support me on Patreon! Thank you to Scott Carter, Christopher Becke, and Jonathan Everett for being my Quality Control Team for this video.
9. ## Placing the Fulcrum on a Seesaw

Example: A 200.0 g mass is placed at the 20.0 cm mark on a uniform 93 g meterstick. A 100.0 g mass is placed at the 90.0 cm mark. Where on the meterstick should the fulcrum be placed to balance the system? Want Lecture Notes? This is an AP Physics 1 Topic. Content Times: 0:01 Seesaw 0:33 The problem 1:28 The fulcrum 2:14 Free body diagram 2:38 Net force 3:35 Net torque 5:49 Combining equations 7:11 Testing our answer 8:11 Alternate solution Next Video: Painter on a Scaffold - Don't Fall Off!! Multilingual? Please help translate Flipping Physics videos! Previous Video: Introductory Rotational Equilibrium Problem Please support me on Patreon! Thank you to Scott Carter, Christopher Becke, and Jonathan Everett for being my Quality Control Team for this video.
10. ## Introductory Rotational Equilibrium Problem

A uniform 0.093 kg meterstick is supported at the 15 cm and 92 cm marks. When a 0.250 kg object is placed at the 6.0 cm mark, what are the magnitudes of the forces supporting the meterstick? Want Lecture Notes? This is an AP Physics 1 Topic. Content Times: 0:07 The problem 1:35 Summing the forces 2:55 Summing the torques 5:17 Combining equations 6:04 Torque distances 7:14 The units!! 8:20 Finding Force Normal 1 9:26 Testing our answers Next Video: Placing the Fulcrum on a Seesaw Multilingual? Please help translate Flipping Physics videos! Previous Video: Rotational Equilibrium Introduction (and Static Equilibrium too!!) Please support me on Patreon! Thank you to Scott Carter, Christopher Becke, and Jonathan Everett for being my Quality Control Team for this video.
11. ## Rotational Equilibrium Introduction (and Static Equilibrium too!!)

An introduction to Rotational Equilibrium with a review of Translational Equilibrium and demonstrations. Wait there’s more … Static Equilibrium! Want Lecture Notes? This is an AP Physics 1 Topic. Content Times: 0:07 Reviewing Translational Equilibrium 1:21 Visualizing Translational Equilibrium 2:07 Rotational Equilibrium Introduction 3:09 Visualizing Rotational Equilibrium 4:22 Static Equilibrium Next Video: Introductory Rotational Equilibrium Problem Multilingual? Please help translate Flipping Physics videos! Previous Video: (2 of 2) Measuring the Rotational Inertia of a Bike Wheel Please support me on Patreon! Thank you to Scott Carter, Christopher Becke, and Jonathan Everett for being my Quality Control Team for this video.
12. ## (2 of 2) Measuring the Rotational Inertia of a Bike Wheel

1) Calculating if our answer makes sense. 2) Why can’t we sum the torques on everything? 3) Finding the force of tension. Want Lecture Notes? This is an AP Physics 1 Topic. Content Times: 0:01 Reviewing from last time 1:08 Does it make sense? 2:41 Calculating the fraction 3:41 Sum the torques on everything? 6:07 Solving for force of tension 8:24 Testing our answer Next Video: Rotational Equilibrium Introduction (and Static Equilibrium too!!) Multilingual? Please help translate Flipping Physics videos! Previous Video: (1 of 2) Measuring the Rotational Inertia of a Bike Wheel Please support me on Patreon! Thank you to Scott Carter, Christopher Becke, and Jonathan Everett for being my Quality Control Team for this video.
13. ## (1 of 2) Measuring the Rotational Inertia of a Bike Wheel

That’s right, we actually measure the rotational inertia of a bicycle wheel. How cool is that? Want Lecture Notes? This is an AP Physics 1 Topic. Content Times: 0:10 Basic setup 0:44 Free Body Diagram 1:30 Finding net torque 3:10 Finding force of tension 4:51 Linear and angular acceleration 5:42 Uniformly angularly accelerated motion 7:00 What do we need to know? 7:35 Solving the problem Next Video: (2 of 2) Measuring the Rotational Inertia of a Bike Wheel Multilingual? Please help translate Flipping Physics videos! Previous Video: Introductory Rotational Form of Newton's Second Law Problem Please support me on Patreon! Thank you to Scott Carter, Christopher Becke, Jonathan Everett, and Faiaz Rahman for being my Quality Control Team for this video.
14. ## Introductory Rotational Form of Newton's Second Law Problem

A basic rotational form of Newton’s Second Law problem with only one force. Want Lecture Notes? This is an AP Physics 1 Topic. Content Times: 0:08 The problem 1:17 Free Body Diagram 1:37 Summing the torques 3:44 The direction Next Video: (1 of 2) Measuring the Rotational Inertia of a Bike Wheel Multilingual? Please help translate Flipping Physics videos! Previous Video: Introductory Rotational Form of Newton's Second Law Problem Please support me on Patreon! Thank you to Scott Carter, Christopher Becke, Jonathan Everett, and Faiaz Rahman for being my Quality Control Team for this video.
15. ## Demonstrating Rotational Inertia (or Moment of Inertia)

Thank you to Arbor Scientific for letting me borrow their Rotational Inertia Demonstrator to … uh … demonstrate rotational inertia. Want Lecture Notes? This is an AP Physics 1 Topic. Content Times: 0:22 The Rotational Inertia Demonstrator 0:58 Rotational Inertia 1:40 Demonstration #1 2:00 Demonstration #2 2:55 Why always balanced? 4:30 Demonstration #3 5:27 Demonstration #4 Next Video: Introductory Rotational Form of Newton's Second Law Problem Want a Rotational Inertia Demonstrator? Multilingual? Please help translate Flipping Physics videos! Previous Video: Rotational Form of Newton's Second Law - Introduction Please support me on Patreon! Thank you to Scott Carter, Christopher Becke, Jonathan Everett, and Faiaz Rahman for being my Quality Control Team for this video.
16. ## Rotational Form of Newton's Second Law - Introduction

A very basic introduction to the rotational form of Newton’s Second Law of Motion by way of its translational form. Want Lecture Notes? This is an AP Physics 1 Topic. Content Times: 0:15 Newton’s Second Law 0:48 The rotational form 1:59 Using the equation 3:13 In words Next Video: Demonstrating Rotational Inertia (or Moment of Inertia) Multilingual? Please help translate Flipping Physics videos! Previous Video: Net Torque on a Door Problem Please support me on Patreon! Thank you to Scott Carter, Christopher Becke, Jonathan Everett, and Faiaz Rahman for being my Quality Control Team for this video.
17. ## Net Torque on a Door Problem

Three people push on a door. We determine the net torque. Want Lecture Notes? This is an AP Physics 1 Topic. Content Times: 0:07 Translating the problem 2:00 Solving the problem 3:07 Torque Direction! Next Video: Rotational Form of Newton's Second Law - Introduction Multilingual? Please help translate Flipping Physics videos! Previous Video: The Right Hand Rule for Torque Please support me on Patreon! Thank you to Christopher Becke and Scott Carter for being my Quality Control Team for this video.
18. ## The Right Hand Rule for Torque

The right hand rule for the direction of torque is described and demonstrated six times. Want Lecture Notes? Content Times: 0:26 The Right Hand Rule 0:47 Demonstration #1 1:27 Demonstration #2 2:37 Demonstration #3 3:20 Demonstration #4 3:40 Demonstration #5 4:24 Demonstration #6 Next Video: Net Torque on a Door Problem Multilingual? Please help translate Flipping Physics videos! Previous Video: An Introductory Torque Wrench Problem Please support me on Patreon! Thank you to Christopher Becke and Scott Carter for being my Quality Control Team for this video.
19. ## An Introductory Torque Wrench Problem

A problem involving forces on a wrench is used to determine the torque exerted by the wrench. A “cheater pipe” is also added. Want Lecture Notes? This is an AP Physics 1 topic. Content Times: 0:07 Translating the problem 2:35 Solving the problem 3:06 Arguing about the angle 4:44 Adding a “Part B” 5:40 Demonstrating the “cheater pipe” Next Video: The Right Hand Rule for Torque Multilingual? Please help translate Flipping Physics videos! Previous Video: Torque Introduction Please support me on Patreon! Thank you to Christopher Becke and Scott Carter for being my Quality Control Team for this video.
20. ## Torque Introduction

Translational and Rotational motion are demonstrated and reviewed. Torque is introduced via the equation and several door opening demonstrations. Moment arm or lever arm is defined and illustrated. Want Lecture Notes? This is an AP Physics 1 topic. Content Times: 0:06 Translational and Rotational Motion 0:58 Defining Torque 1:53 The torque equation 2:59 Door example #1 4:56 Door example #2 6:11 Door example #3 6:58 Defining moment arm 9:18 Torque units Next Video: An Introductory Torque Wrench Problem Multilingual? Please help translate Flipping Physics videos! Previous Video: Moments of Inertia of Rigid Objects with Shape Please support me on Patreon! Thank you to Christopher Becke and Scott Carter for being my Quality Control Team for this video.
21. ## Moments of Inertia of Rigid Objects with Shape

The moment of inertia of a system of particles equation is used to estimate six different moments of inertia of rigid objects with constant density. Want Lecture Notes? This is an AP Physics 1 topic. Content Times: 0:10 Visualizing the examples 1:09 How we estimate 2:16 Thin rod - center of mass 2:57 Thin rod - one end 4:00 Thin, hollow cylinder - long cylindrical axis 6:32 Solid cylinder - long cylindrical axis 8:23 Solid sphere - center of mass 9:11 Thin, hollow sphere - center of mass 10:31 Important review points Next Video: Torque Introduction Multilingual? Please help translate Flipping Physics videos! Previous Video: Eggs in a Carton Moment of Inertia Problem Please support me on Patreon! Thank you to Christopher Becke, Andres Ramos, and Aarti Sangwan for being my Quality Control Team for this video.
22. ## Eggs in a Carton Moment of Inertia Problem

Two equal mass eggs are placed at either end in an egg carton of negligible mass. The egg carton is initially rotated about its middle. If the egg carton is now rotated about one end, what is the final moment of inertia of the eggs relative to their initial moment of inertia? Want Lecture Notes? This is an AP Physics 1 topic. Content Times: 0:07 Translating the problem 0:47 Initial moment of inertia 1:52 Final moment of inertia 2:46 This is a rough estimate Next Video: Moments of Inertia of Rigid Objects with Shape Multilingual? Please help translate Flipping Physics videos! Previous Video: Introductory Moment of Inertia and Rotational Kinetic Energy Problem Please support me on Patreon! Thank you to Christopher Becke for being my Quality Control Team for this video.
23. ## Introductory Moment of Inertia and Rotational Kinetic Energy Problem

Three 20.0-gram masses are 9.4 cm from an axis of rotation and rotating at 152 revolutions per minute. What is the moment of inertia of the three-object system? The strings holding the masses are of negligible mass. Rotational Kinetic Energy is also solved for and correct units are determined. Want Lecture Notes? This is an AP Physics 1 topic. Content Times: 0:02 Demonstration 0:14 Translating the problem 0:57 Solving the problem 2:40 Moment of Inertia and angular velocity 3:35 Rotational Kinetic Energy 4:04 Fixing the units 6:27 Solving for joules 7:17 Comparing to Gravitational Potential Energy Next Video: Eggs in a Carton Moment of Inertia Problem Multilingual? Please help translate Flipping Physics videos! Previous Video: Moment of Inertia Introduction and Rotational Kinetic Energy Derivation Please support me on Patreon! Thank you to Scott Carter, Jonathan Everett, and Christopher Becke for being my Quality Control Team for this video.
24. ## Moment of Inertia Introduction and Rotational Kinetic Energy Derivation

The concept of kinetic energy applied to a stationary, rotating wheel is used to define Moment of Inertia and derive Rotational Kinetic Energy. Moment of Inertia is demonstrated. Want Lecture Notes? This is an AP Physics 1 topic. Content Times: 0:07 Kinetic Energy of rotation 2:24 Defining Moment of Inertia 3:00 Defining Rotational Kinetic Energy 4:29 “Rotational Mass” 5:44 Demonstration #1 6:45 Demonstration #2 Next Video: Introductory Moment of Inertia and Rotational Kinetic Energy Problem Multilingual? Please help translate Flipping Physics videos! Previous Video: Conical Pendulum Demonstration and Problem Please support me on Patreon! Thank you to Scott Carter, Kevin Kulka, Jonathan Everett, and Christopher Becke for being my Quality Control Team for this video.

26. ## Throwing a Ball in a Boat - Demonstrating Center of Mass

When I throw a massive ball to the left such that it lands in the other end of the canoe, what will happen to the positions of the objects? What if the ball does not land in the canoe? This video provides answers and solutions to those questions. Want Lecture Notes? This is an AP Physics 1 topic. Content Times: 0:01 Ball lands in canoe center of mass question 0:52 Demonstrating the answer 1:16 Explaining the answer 3:31 What is the ball lands outside the canoe? 4:28 Demonstrating the answer 5:08 The math solution 8:03 The physics works! Multilingual? Please help translate Flipping Physics videos! Previous Video: Center of Mass of an Object with a Hole Please support me on Patreon! Thank you to Will Longsworth, Christopher Becke, Jonathan Everett, Scott Carter, and Aarti Sangwan for being my Quality Control Team for this video. Thank you to Youssef Nasr for transcribing the English subtitles of this video.
27. ## Center of Mass of an Object with a Hole

How to find the center of mass of an object with a missing piece. Want Lecture Notes? This is an AP Physics 1 topic. Content Times: 0:07 The problem 1:18 Center of mass locations 2:59 Solving the problem 5:14 Testing the answer Next Video: Throwing a Ball in a Boat - Demonstrating Center of Mass Multilingual? Please help translate Flipping Physics videos! Previous Video: Center of Mass of an Irregular Object Please support me on Patreon! Thank you to Christopher Becke, Jonathan Everett, and Scott Carter for being my Quality Control Team for this video. Thank you to Youssef Nasr for transcribing the English subtitles of this video.

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