timestamps

• 0:00

  Introduction and Announcements

• 0:35

  Upcoming Physics Streams

• 1:36

  Elevator Problem from Chat

• 2:38

  Elevator Forces Explanation

• 3:41

  Gravity and Normal Force

• 5:21

  Feeling Weight in Elevators

• 6:57

  Weightless Condition

• 8:34

  Accelerating Upwards Example

• 10:07

  Accelerating Downward

• 11:43

  Normal Force Calculation

• 13:16

  2019 FRQ Overview

• 14:20

  Block Scenario Description

• 15:55

  Center of Mass Speed Graph

• 17:57

  External Forces Identification

• 19:30

  Graphing Speed Changes

• 21:04

  Scoring Breakdown

• 24:20

  Sphere Angular Momentum

• 26:32

  Torque from Friction

• 28:38

  Interval C to D Change

• 30:15

  Friction Torque Diagram

• 32:20

  Question 2 Setup

• 33:53

  Acceleration When A Heavy

• 35:34

  Reasoning Without Equations

• 37:45

  Acceleration When A Light

• 39:23

  Close to G Explanation

• 40:56

  Free Body Diagrams

• 42:33

  No Friction on A

• 44:06

  Same Tensions Reasoning

• 46:13

  Deriving Acceleration Equation

• 48:21

  Solving for Acceleration

• 50:03

  Equation Supports Qualitative

• 52:51

  Heavy Pulley Effect

• 54:28

  Acceleration Decreases

• 56:36

  Pulley Torque Equations

• 58:19

  Added Mass in System

• 59:31

  Tensions Comparison

• 1:01:07

  Reasoning for T2 Greater

• 1:04:28

  Upcoming Reviews and Q&A

• 1:05:00

  Closing Remarks