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**Name:** When is a Pendulum in Simple Harmonic Motion?**Category:** Oscillations**Date Added:** 2018-04-22**Submitter:** Flipping Physics

Demonstrating when a pendulum is in simple harmonic motion. Want Lecture Notes? This is an AP Physics 1 topic.

Content Times:

0:09 Reviewing simple harmonic motion

0:24 Showing a pendulum in simple harmonic motion

1:47 Velocities in simple harmonic motion

2:15 Accelerations in simple harmonic motion

2:57 A pendulum’s restoring force

5:07 A maximum of 15°

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Previous Video: Horizontal vs. Vertical Mass-Spring System

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**Name:** Horizontal vs. Vertical Mass-Spring System**Category:** Oscillations**Date Added:** 2018-04-22**Submitter:** Flipping Physics

Demonstrating the difference between vertical and horizontal mass-spring systems. Want Lecture Notes? This is an AP Physics 1 topic.

Content Times:

0:12 The impossible frictionless, horizontal mass-spring system

0:44 It’s actually a vertical mass-spring system rotated 90 degrees

1:01 Similarities between horizontal and vertical mass-spring systems

Thank you to Anish, Kevin, and Olivia for being my “substitute students” in this video!

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Previous Video: Simple Harmonic Motion - Force, Acceleration, and Velocity at 3 Positions

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**Name:** Simple Harmonic Motion - Force, Acceleration, and Velocity at 3 Positions**Category:** Oscillations**Date Added:** 2018-04-15**Submitter:** Flipping Physics

Identifying the spring force, acceleration, and velocity at the end positions and equilibrium position of simple harmonic motion. Amplitude is also defined and shown. Want Lecture Notes? This is an AP Physics 1 topic.

Content Times:

0:01 Identifying the 3 positions

0:43 Velocity

1:43 Spring Force

2:14 Amplitude

2:30 Acceleration

3:22 Velocity at position 2

4:12 Is simple harmonic motion also uniformly accelerated motion?

Thank you to Anish, Kevin, and Olivia for being my “substitute students” in this video!

Next Video: Horizontal vs. Vertical Mass-Spring System

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Previous Video: Simple Harmonic Motion Introduction via a Horizontal Mass-Spring System

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**Name:** Simple Harmonic Motion Introduction via a Horizontal Mass-Spring System**Category:** Oscillations**Date Added:** 2018-04-15**Submitter:** Flipping Physics

Simple Harmonic Motion is introduced and demonstrated using a horizontal mass-spring system. Want Lecture Notes? This is an AP Physics 1 topic.

Content Times:

0:01 A horizontal mass-spring system

0:29 Equilibrium position and positions 1, 2, and 3

2:05 Demonstrating simple harmonic motion

2:53 Requirements for simple harmonic motion

Thank you to Anish, Kevin, and Olivia for being my “substitute students” in this video!

Next Video: Simple Harmonic Motion - Force, Acceleration, and Velocity at 3 Positions

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Previous Video: Impulse for Two Objects being Attracted to One Another

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**Name:** The Human Spine acts like a Compression Spring**Category:** Oscillations**Date Added:** 2018-04-02**Submitter:** Flipping Physics

A horizontal spring is attached to a cord, the cord goes over a pulley, and a 0.025 kg mass is attached to the cord. If the spring is stretched by 0.045 m, what is the spring constant of the spring?

Want Lecture Notes? This is an AP Physics 1 topic.

Content Times:

0:07 Translating the problem

0:39 Solving the problem

2:26 Comparing to a vertical spring

3:30 Expansion vs. compression springs

3:56 The human spine acts like a compression spring

Next Video: You Can't Run From Momentum! (a momentum introduction)

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Previous Video: Determining the Spring Constant, k, with a Vertically Hanging Mass

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**Name:** Determining the Spring Constant, k, with a Vertically Hanging Mass**Category:** Oscillations**Date Added:** 2018-04-02**Submitter:** Flipping Physics

A vertically hanging spring with a natural length of 5.4 cm is extended to a length of 11.4 cm when 25 grams is suspended from it. What is the spring constant of the spring?

Want Lecture Notes? This is an AP Physics 1 topic.

Content Times:

0:08 Translating the problem

0:54 The free body diagram

1:53 Understanding the direction of the Spring Force

2:46 Summing the forces

3:32 Common misconception when using Hooke’s Law equation

5:00 Using the magnitude of the displacement from equilibrium

Next Video: The Human Spine acts like a Compression Spring

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Previous Video: Hooke's Law Introduction - Force of a Spring

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**Name:** Hooke's Law Introduction - Force of a Spring**Category:** Oscillations**Date Added:** 2018-04-02**Submitter:** Flipping Physics

Hooke’s law is demonstrated and graphed. Spring constant, displacement from equilibrium position, and restoring force are defined and demonstrated.

Want Lecture Notes? This is an AP Physics 1 topic.

Content Times:

0:01 Robert Hooke

0:46 Compressing a spring using a force sensor

1:33 Graphing force as a function of position

2:14 Hooke’s Law

3:07 Demonstrating displacement from rest position

5:20 Demonstrating the spring constant

6:15 What the negative in Hooke’s Law means

7:02 The spring constant is positive

7:54 The restoring force

8:33 Elastic limit

Next Video: Determining the Spring Constant, k, with a Vertically Hanging Mass

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Previous Video: Instantaneous Power Delivered by a Car Engine - Example Problem

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**Name:** Force of Gravity and Gravitational Potential Energy Functions from Zero to Infinity (but not beyond)**Category:** Circular Motion & Gravity**Date Added:** 2018-03-11**Submitter:** Flipping Physics

Calculus is used to determine the force of gravity and the gravitational potential energy between an object and a planet, inside and outside the planet. Equations and graphs are determined and discussed. Want Lecture Notes? This is an AP Physics C: Mechanics topic.

Content Times:

0:01 Basic universal gravitation equations

1:07 Outside the planet

1:42 Assumptions for inside the planet

3:38 Deriving mass inside r

4:23 Determining the equation for force of gravity inside the planet

5:24 Graphing the force of gravity inside the planet

5:59 Determining the equation for universal gravitational potential energy inside the planet

7:37 Solving for the constant C

8:49 The equation for universal gravitational potential energy inside the planet

9:41 Looking over the graphs

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**Name:** Impulse for Two Objects being Attracted to One Another**Category:** Circular Motion & Gravity**Date Added:** 2018-03-11**Submitter:** Flipping Physics

In a universe devoid of anything else, two identical spheres of mass, m, and radius, R, are released from rest when they have a distance between their centers of mass of X. Find the magnitude of the impulse delivered to each sphere until just before they make contact. Want Lecture Notes? This is an AP Physics 1 topic.

Content Times:

0:07 Translating the problem

1:26 Applicable impulse equations

2:13 Conservation of mechanical energy

3:28 Showing a common mistake

4:00 Solving the problem

Next Video: Force of Gravity and Gravitational Potential Energy Functions from Zero to Infinity (but not beyond)

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Previous Video: Mechanical Energy of a Satellite in Circular Orbit

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**Name:** Mechanical Energy of a Satellite in Circular Orbit**Category:** Circular Motion & Gravity**Date Added:** 2018-03-04**Submitter:** Flipping Physics

The mechanical energy of a satellite in circular orbit is solved for in terms of universal gravitational potential energy. And the velocity of the satellite is compared to escape velocity.

Want Lecture Notes? This is an AP Physics 1 topic.

Content Times:

0:14 Types of mechanical energy of a satellite

1:21 Solving for the velocity of a satellite in circular orbit

2:34 Solving for the mechanical energy of a satellite

3:31 Comparing satellite velocity to escape velocity

Next Video: Impulse for Two Objects being Attracted to One Another

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Previous Video: Deriving Escape Velocity of Planet Earth

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**Name:** Deriving Escape Velocity of Planet Earth**Category:** Circular Motion & Gravity**Date Added:** 2018-02-25**Submitter:** Flipping Physics

Escape velocity is defined and illustrated. The escape velocity of planet Earth is derived.

Want Lecture Notes? This is an AP Physics 1 topic.

Content Times:

0:07 Translating the problem

0:42 Defining escape velocity

1:43 Conservation of mechanical energy

3:22 Initial and final mechanical energies

5:38 The escape velocity of planet Earth

6:19 Relating this to binding energy

Next Video: Mechanical Energy of a Satellite in Circular Orbit

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Previous Video: Deriving the Binding Energy of a Planet

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**Name:** Deriving the Binding Energy of a Planet**Category:** Circular Motion & Gravity**Date Added:** 2018-02-18**Submitter:** Flipping Physics

Binding energy of a planet is defined and derived.

Want Lecture Notes? This is an AP Physics 1 topic.

Content Times:

0:21 Defining binding energy

0:48 Proving change in gravitational potential energy equals work done by force applied

3:03 Universal gravitational potential energy

3:39 The binding energy of a planet

5:16 An alternate way of solving this problem

Next Video: Deriving Escape Velocity of Planet Earth

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Previous Video: Universal Gravitational Potential Energy Introduction

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**Name:** Universal Gravitational Potential Energy Introduction**Category:** Circular Motion & Gravity**Date Added:** 2018-02-12**Submitter:** Flipping Physics

Universal Gravitational Potential Energy is introduced and graphed. It is compared to the force of gravity. And the “zero line” is defined.

Want Lecture Notes? This is an AP Physics 1 topic.

Content Times:

0:11 “Normal” gravitational potential energy

1:33 Gravitational fields

2:22 Universal Gravitational Potential Energy Equation

3:07 Comparing gravitational potential energy to force of gravity

4:12 Graphing Universal Gravitational Potential Energy

5:35 The “zero line” for universal gravitational potential energy

6:05 Can universal gravitational potential energy ever be positive?

6:49 Gravitational potential energy at the surface of the Earth

7:57 Three things to be careful of.

Next Video: Deriving the Binding Energy of a Planet

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Previous Video: Gravitational Field Introduction

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**Name:** Gravitational Field Introduction**Category:** Circular Motion & Gravity**Date Added:** 2018-02-05**Submitter:** Flipping Physics

The gravitational field is introduced and illustrated. For a constant field and a non-constant field around a spherical object.

Want Lecture Notes? This is an AP Physics 1 topic.

Content Times:

0:01 The two force of gravity equations

0:55 The constant gravitational field equation

2:25 Gravitational Field Lines

3:16 What is a gravitational field?

4:33 The gravitational field equation around a spherical object

5:48 Drawing the field lines around a spherical object

7:02 Are gravitational field lines real?

Next Video: Universal Gravitational Potential Energy Introduction

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Previous Video: Number of g's or g-Forces Introduction

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**Name:** Number of g's or g-Forces Introduction**Category:** Circular Motion & Gravity**Date Added:** 2018-01-28**Submitter:** Flipping Physics

Description and examples of g-forces or number of g’s.

Want Lecture Notes? This is an AP Physics 1 topic.

Content Times:

0:14 Equations for g-forces or number of g’s

1:08 Number of g’s when at rest on the surface of the Earth

2:43 Number of g’s when in orbit

3:33 Apparent Weightlessness

4:20 How to experience apparent weightlessness in a car

5:22 Apparent weightlessness examples

6:05 Describing number of g’s again

7:08 More examples of number of g’s

Next Video: Gravitational Field Introduction

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Previous Video: Apparent Weightlessness Introduction

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Picture and Video credits:

NASA Logo https://www.nasa.gov/sites/default/files/thumbnails/image/nasa-logo-web-rgb.png

Liquid Ping Pong in Space - RED 4K https://www.youtube.com/watch?v=TLbhrMCM4_0

Side view of plane in field - https://commons.wikimedia.org/wiki/File:Airplanes_-_Types_-_Kirkham_Triplane_manufactured_by_the_Curtiss_Engineering_Corp.,_Garden_City,_Long_Island._Side_view_of_plane_in_field_-_NARA_-_17341451.jpg Tesla-Roadster-2020-1280-01 - https://www.netcarshow.com/tesla/2020-roadster/1280x960/wallpaper_01.htm STS120LaunchHiRes-edit1 - https://commons.wikimedia.org/wiki/File:STS120LaunchHiRes-edit1.jpg Soyuz_TMA-13_Edit - https://commons.wikimedia.org/wiki/File:Soyuz_TMA-13_Edit.jpg

Hong Kong skyscrapers in a night of typhoon.jpg - https://upload.wikimedia.org/wikipedia/commons/8/8d/Hong_Kong_skyscrapers_in_a_night_of_typhoon.jpg

**Name:** Apparent Weightlessness Introduction**Category:** Circular Motion & Gravity**Date Added:** 2018-01-21**Submitter:** Flipping Physics

Learn why astronauts in the International Space Station appear to have no weight.

Want Lecture Notes? This is an AP Physics 1 topic.

Content Times:

0:01 What is necessary for an object to be completely weightless?

2:34 Determining the acceleration due to gravity on the International Space Station

3:41 Why astronauts appear to be weightless

4:55 Why the International Space Station does not fall to the Earth

5:37 Objects in orbit experience apparent weightlessness

5:56 Other examples of apparent weightlessness

Next Video: Number of g's or g-Forces Introduction

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Previous Video: Dropping a Bucket of Water - Demonstration

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**Name:** Dropping a Bucket of Water - Demonstration**Category:** Circular Motion & Gravity**Date Added:** 2018-01-14**Submitter:** Flipping Physics

Demonstrating the physics of dropping a bucket of water with two holes in it.

Want Lecture Notes? This is an AP Physics 1 topic.

Content Times:

0:17 The physics of dropping a bucket of water with two holes in it

0:57 The demonstration

1:18 Why water stops flowing out of the holes

2:43 Why it takes half a second for water to stop flowing out of the holes

Next Video: Apparent Weightlessness Introduction

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Previous Video: Altitude of Geostationary Orbit (a special case of Geosynchronous Orbit)

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**Name:** Do You Feel Your Weight?**Category:** Dynamics**Date Added:** 2017-12-19**Submitter:** Flipping Physics

No. You do not feel your weight. You feel the force normal acting on you. This video shows why and demonstrates what you feel on an elevator.

Want Lecture Notes? This is an AP Physics 1 topic.

Content Times:

0:22 Showing that you do not feel your weight

1:10 What does the scale actually measure?

2:10 Elevator example

3:12 Determining your apparent weight on the elevator

4:23 An elevator in free fall!

5:42 Apparent weightlessness

Next Video: 5 Steps to Solve any Free Body Diagram Problem

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Previous Video: Introduction to Equilibrium

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**Name:** Brainiac - Electric Fence**Category:** Electricity & Magnetism**Date Added:** 2017-12-18**Submitter:** FizziksGuy

Electric Fence Experiment Richard Hammond shows the Brainiacs how fun Electricity can be. Also, yes, if you are in the air when the electricity goes through, you don't get a shock. You don't get shocked if the circuit (box to fence to person to ground to box) doesn't complete. On top of that, the end where he ALMOST shakes Hammond's hand, he doesn't. Also, the slight gap in time between feet hitting ground and the shock can be attributed to the 1-2 second delay caused by the fence not being constantly on.

**Name:** Altitude of Geostationary Orbit (a special case of Geosynchronous Orbit)**Category:** Circular Motion & Gravity**Date Added:** 2018-01-07**Submitter:** Flipping Physics

Calculate the altitude of a satellite in geosynchronous orbit or geostationary orbit.

Want Lecture Notes? This is an AP Physics 1 topic.

Content Times:

0:11 What is geosynchronous orbit?

0:47 Drawing the free body diagram and starting to solve the problem

3:02 Solving for the satellite’s angular velocity

4:05 Identifying the masses and radii

5:25 Defining “r” and solving for altitude

6:29 The physics works!

Next Video: Dropping a Bucket of Water - Demonstration

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Previous Video: Deriving the Acceleration due to Gravity on any Planet and specifically Mt. Everest

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**Name:** Deriving the Acceleration due to Gravity on any Planet and specifically Mt. Everest**Category:** Circular Motion & Gravity**Date Added:** 2017-12-11**Submitter:** Flipping Physics

Derive the acceleration due to gravity on any planet. Find the acceleration due to gravity on Mt. Everest. And determine how much higher you could jump on the top of Mt. Everest!

Want Lecture Notes? This is an AP Physics 1 topic.

Content Times:

0:08 Deriving the acceleration due to gravity on any planet

1:54 Finding the acceleration due to gravity on Mt. Everest

3:16 How much higher could you jump on the top of Mt. Everest?

Next Video: Altitude of Geosynchronous Orbit (aka Geostationary Orbit)

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Previous Video: The Force of Gravitational Attraction between the Earth and the Moon

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**Name:** The Force of Gravitational Attraction between the Earth and the Moon**Category:** Circular Motion & Gravity**Date Added:** 2017-12-03**Submitter:** Flipping Physics

According to NASA, the mass of the Earth is 5.97 x 10^24 kg, the mass of the Moon is 7.3 x 10^22 kg, and the mean distance between the Earth and the Moon is 3.84 x 10^8 m. What is the force of gravitational attraction between the Earth and the Moon? Want Lecture Notes? This is an AP Physics 1 topic.

Content Times:

0:07 Translating the problem

0:56 Solving the problem

2:15 Determining how long until the Moon crashes into the Earth

4:00 Determining what is wrong with this calculation

Next Video: Deriving the Acceleration due to Gravity on any Planet and specifically Mt. Everest

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Previous Video: How Much is a Mermaid Attracted to a Doughnut?

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**Name:** How Much is a Mermaid Attracted to a Doughnut?**Category:** Circular Motion & Gravity**Date Added:** 2017-11-27**Submitter:** Flipping Physics

How Much is a Mermaid Attracted to a Doughnut? A practical, everyday example of Newton’s Universal Law of Gravitation.

Want Lecture Notes? This is an AP Physics 1 topic.

Content Times:

0:08 Translating the problem

0:42 The Force of Gravity Equation

1:47 Solving the problem

2:24 How to do “times ten to the” on your calculator

2:45 Correcting our mistake

3:42 Visualizing these forces

4:14 Why do the objects not move?

5:36 What if the mermaid and donut were the only two objects in the universe?

Next Video: The Force of Gravitational Attraction between the Earth and the Moon

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Previous Video: Newton's Universal Law of Gravitation Introduction (The Big G Equation)

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**Name:** Newton's Universal Law of Gravitation Introduction (The Big G Equation)**Category:** Circular Motion & Gravity**Date Added:** 2017-11-20**Submitter:** Flipping Physics

Understanding Newton’s Universal Law of Gravitation. Including a dramatization of The Cavendish Experiment and force visualization via qualitative examples.

Want Lecture Notes? This is an AP Physics 1 topic.

Content Times:

0:11 Reviewing the standard Force of Gravity or Weight equation

0:56 Newton’s Universal Law of Gravitation

1:48 Defining r

2:47 The Cavendish Experiment

3:52 Visualizing qualitative examples

5:59 When to use the two Force of Gravity equations

Next Video: How Much is a Mermaid Attracted to a Doughnut?

Thank you to Bronson Hoover of dnbstudios for letting me use his original composition Bèke as Henry Cavendish’s background music.

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Previous Video: Conical Pendulum Demonstration and Problem

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