A problem involving forces on a wrench is used to determine the torque exerted by the wrench. A “cheater pipe” is also added.

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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”

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Previous Video: Torque Introduction

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]]>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

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Previous Video: Moments of Inertia of Rigid Objects with Shape

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]]>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

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Previous Video: Eggs in a Carton Moment of Inertia Problem

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]]>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

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Previous Video: Introductory Moment of Inertia and Rotational Kinetic Energy Problem

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]]>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

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Previous Video: Moment of Inertia Introduction and Rotational Kinetic Energy Derivation

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]]>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

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Previous Video: Conical Pendulum Demonstration and Problem

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]]>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!

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Previous Video: Center of Mass of an Object with a Hole

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]]>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

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Previous Video: Center of Mass of an Irregular Object

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]]>How to find the center of mass of an irregularly shaped, flat object. Want Lecture Notes? This is an AP Physics 1 topic.

Content Times:

0:08 The problem

0:57 Translating the problem

2:52 Area instead of mass

4:42 Solving the problem

6:05 Understanding the answer

Next Video: Center of Mass of an Object with a Hole

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Previous Video: Calculating the Center of Mass of a System of Particles

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Thank you to 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.

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