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

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]]>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

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Previous Video: Using Integrals to Derive Rotational Inertia of a Long, Thin Rod with Demonstration

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]]>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

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Graphing the Rotational Inertia of an Irregular Shape

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]]>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

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Previous Video: Graphing the Rotational Inertia of an Irregular Shape

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]]>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

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]]>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

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Previous Video: Placing the Fulcrum on a Seesaw

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]]>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

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Previous Video: Introductory Rotational Equilibrium Problem

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]]>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

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Previous Video: Rotational Equilibrium Introduction (and Static Equilibrium too!!)

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]]>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

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Previous Video: (2 of 2) Measuring the Rotational Inertia of a Bike Wheel

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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!!)

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Previous Video: (1 of 2) Measuring the Rotational Inertia of a Bike Wheel

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