AP Physics 1 - 2020 Exam Sample Questions Full Solution
Link To Question
https://apcentral.collegeboard.....org/pdf/ap-2020exam

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A small sphere of mass M is suspended by a string of length L. The sphere is made to move in a horizontal circle of radius R at a constant speed, as shown above. The center of the circle is labeled point C, and the string makes angle θ0 with the vertical

Two students are discussing the motion of the sphere and make the following statements.
Student 1: None of the forces exerted on the sphere are in the direction of point C, the center of the circular path. Therefore, I don’t see how there can be a centripetal force exerted on the sphere to make it move in a circle.

Student 2: I see another problem. The tension force exerted by the string is at an angle from the vertical. Therefore, its vertical component must be less than the weight Mg of the sphere. That means the net force on the sphere has a downward vertical component, and the sphere should move downward as well as moving around in a circle.

(a) What is one aspect of Student 1’s reasoning that is incorrect? Explain why.
(b) What is one aspect of Student 2’s reasoning that is incorrect? Explain why.

Student 3 correctly derives two equations to relate the tension force FT to the net force Fnet and the other quantities.
(c) Explain how one of the equations can be used to challenge Student 1’s claim.
(d) Explain how one of the equations can be used to challenge Student 2’s claim.

The students observe that the radius R increases as the speed v of the sphere increases. Together, they derive the equation R = v L/g to calculate the radius of the circle R followed by the sphere if its speed is v.
(e) Regardless of whether this equation is correct or incorrect, does it plausibly model the students’ observation about the relationship between R and v? Why or why not?
(f) This equation does not correctly model the relationship between R and v if v is very fast. Explain why.

Instead of moving in a horizontal circle, the sphere now moves in a vertical plane so that it is a simple pendulum, as shown above. The maximum angle θmax that the string makes from the vertical can be assumed to be small. The graph below shows data for the square of the pendulum period T as a function of string length L.

Explain how the above graph would change under each of the following circumstances. Justify your answers.
(g) The mass of the sphere is increased.
(h) The maximum angle θmax is decreased.
(i) The pendulum is taken to the Moon.



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Lesson 14 (Rotation and Torque) of Dianna's Intro Physics Class on Physics Girl. Never taken physics before? Want to learn the basics of physics? Need an AP Physics 1 review before the exam? This course is for you!

Exercises in this video:
1. If you are standing on Earth’s equator (radius about 6380km), how fast are you going? What is your rotational velocity? What is your angular velocity?

2. A tiny cat, mass 0.50kg is clinging to the edge of a record spinning at 45rpm. If the radius of the record is 0.10m, what is the frictional force keeping that cat moving in a circle?

3. If Dianna, mass 60 kg, is standing on a scale on the equator, what does the scale actually read?

4. Dianna and Marie want to balance on a seesaw. But Marie has 3 times Dianna’s mass. How far away from Dianna should they move the fulcrum in order to balance the seesaw?

Special thanks to propulsion engineer Diana Alsindy for her awesome shoutout at the end of the video! You can follow her on Twitter @DianaAlsindy

Credits:
Dianna Cowern - Executive Producer/Host/Writer
Jeff Brock - Lead Writer/Course Designer
Laura Chernikoff - Producer
Rachel Watson - Video Editor
Sophia Chen - Researcher/Writer
Erika K. Carlson - Researcher/Writer
Hope Butner - Production Assistant
Levi Butner - Videographer
Lauren Ivy - Set Design
Vanessa Hill - Consulting Producer
Aleeza McCant - Illustrator
Rachel Allen - Illustrator
Consultant - Kyle Kitzmiller
Lucy Brock, Samantha Ward - Curriculum Consultants
Cathy Cowern - Transcription

ALL OF PHYSICS in 14 Minutes: https://youtu.be/ZAqIoDhornk

Everything is made of atoms. Chemistry is the study of how they interact, and is known to be confusing, difficult, complicated...let's learn General Chemistry in under 20 Minutes.

This is not ALL of Chemistry, as fields like "Organic Chemistry" deserve videos of their own. But, this is the foundation, or "General Chemistry", which contains most concepts you need to know to understand other topics and fields of Chemistry.

This is a summary and revision of around 4 years of Chemistry you learn in school, with maybe some university level concepts sprinkled in the mix.
This video is a good summary for preparing for exams and finals. Maybe. Perhaps.

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Timestamps:
00:00 Intro
00:16 Valence Electrons
00:34 Periodic Table
01:24 Isotopes
01:34 Ions
01:47 How to read the Periodic Table
02:09 Molecules & Compounds
02:27 Molecular Formula & Isomers
02:53 Lewis-Dot-Structures
03:03 Why atoms bond
03:26 Covalent Bonds
03:37 Electronegativity
03:54 Ionic Bonds & Salts
04:25 Metallic Bonds
04:59 Polarity
05:37 Intermolecular Forces
05:51 Hydrogen Bonds
06:00 Van der Waals Forces
06:20 Solubility
06:46 Surfactants
07:00 Forces ranked by Strength
07:07 States of Matter
07:28 Temperature & Entropy
07:49 Melting Points
08:01 Plasma & Emission Spectrum
08:35 Mixtures
09:24 Types of Chemical Reactions
09:45 Stoichiometry & Balancing Equations
10:16 The Mole
10:46 Physical vs Chemical Change
11:05 Activation Energy & Catalysts
11:24 Reaction Energy & Enthalpy
11:42 Gibbs Free Energy
12:50 Chemical Equilibriums
13:15 Acid-Base Chemistry
13:41 Acidity, Basicity, pH & pOH
14:43 Neutralisation Reactions
14:56 Redox Reactions
15:18 Oxidation Numbers
16:01 Quantum Chemistry

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Professor Brian Cox of the University of Manchester presents an educational walk, through the fundamentals of Particle Physics.

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This is a review of all the topics on the AP Physics C Mechanics exam.

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Lesson 18 (Electric Charge and Light) of Dianna's Intro Physics Class on Physics Girl. Never taken physics before? Want to learn the basics of physics? Need a review of AP Physics concepts before the exam? This course is for you!

Exercises in this video:
1. How many electrons are in 1 Coulomb of charge? How many protons?

2. What is the electromagnetic force between an electron and a proton that are separated by 1nm?

3. To compare, what would the force of gravity between the proton and the electron be?

4. An electron is in a constant electric field with a strength of -4.4x10^5N/C. What force is being exerted on that electron by the field?

Credits:
Dianna Cowern - Executive Producer/Host/Writer
Jeff Brock - Lead Writer/Course Designer
Laura Chernikoff - Producer
Kaitlyn Ali - Video Editor
Bryn Bishop - AP Curriculum Consultant
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Erika K. Carlson - Researcher/Writer
Hope Butner - Production Assistant
Levi Butner - Videographer
Lauren Ivy - Set Design
Vanessa Hill - Consulting Producer
Aleeza McCant - Illustrator
Rachel Allen - Illustrator
Consultant - Kyle Kitzmiller
Lucy Brock, Samantha Ward - Curriculum Consultants
Cathy Cowern - Transcription

This video tutorial provides a basic introduction into physics with calculus. It covers derivatives such as the power rule and basic integration of definite integrals and indefinite integrals. This video covers topics on displacement, velocity, acceleration, net force, work, momentum, and impulse.

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Minute Physics provides an energetic and entertaining view of old and new problems in physics -- all in a minute!

In this episode, we discuss the Wave Particle Duality and why quantum mechanics is weirder than anything we're used to in our daily lives! Created by Henry Reich

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In this video I will show you how to calculate the final velocity of a car moving at constant acceleration.

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Review of the topics of Work, Energy, Power and Hooke’s Law covered in the AP Physics 1 curriculum. Want Lecture Notes? http://www.flippingphysics.com..../ap1-work-review.htm

0:00 Intro
0:18 Work
1:38 Kinetic Energy
2:13 Elastic Potential Energy
3:02 Gravitational Potential Energy
4:02 Work and Energy are in Joules
4:58 Conservation of Mechanical Energy
5:54 Work due to Friction equals the Change in Mechanical Energy
6:46 Power
7:46 Hooke’s Law

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Linear Momentum and Impulse Review for AP Physics 1
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00:00:00 - Intro
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00:11:10 - What is a unit?
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00:33:23 - Supplementary SI Units
00:34:13 - Plane angle
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00:45:13 - Other systems of units
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Lesson 9 (Work and Energy) of Dianna's Intro Physics Class on Physics Girl. Never taken physics before? Want to learn the basics of physics? Need an AP Physics 1 review before the exam? This course is for you!

Exercises in this video:
1. A rocket pushes a space cow, from rest, with a Force of 100N, over a distance of 10m. How much work did the rocket do? What is the final kinetic energy of the cow? How fast is the cow moving?

2. You lift a 10kg cow, with a constant velocity, 10m up. How much work did you do? How much potential energy is stored in the gravitational field?

3. You drop the cow 10m onto a big cow airbag. How fast was the cow moving right before she hit the airbag? How fast would a cow with twice as massive be moving with the same setup?

4. A giant wrecking ball with 80kg mass, is dropped from a height of 35m. It bounces off of a trampoline and reaches a height of 14m on the return trip. How much energy was lost to heat in the bounce?

5. A square cow slides down a frictionless ramp, starting at a height h above the ground. At the bottom the cow starts sliding along the ground. How far does the cow slide, in terms of m, g, h, and u, where u is the coefficient of friction between the cow and the ground? [u is mu]

Special thanks to Mark Rober for his encouraging shoutout and to Simone Giertz for letting me almost hit myself in the face with a bowling ball at her workshop.

Credits:
Dianna Cowern - Executive Producer/Host/Writer
Jeff Brock - Lead Writer/Course Designer
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Rachel Allen - Illustrator
Consultant - Kyle Kitzmiller
Lucy Brock, Samantha Ward - Curriculum Consultants
Cathy Cowern - Transcription

Visit http://ilectureonline.com for more math and science lectures!

In this video I will show you how to subtract vectors graphically.

Next video in this series can be seen at:
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In this video I will show you how to subtract vectors numerically.

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Using a one-dimensional number line to visualize and calculate distance and displacement.

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AP Physics 1 on Khan Academy: Meet one of our writers for AP¨_ Physics, Sean. A physics teacher for seven years, Sean has taught AP¨_ Physics 1, AP¨_ Physics C, and Conceptual Physics. HeÕs also a former mechanical engineer. Sean is based in Boise, Idaho, and is a Khan Academy physics fellow, creating awesome new exercises and articles for AP¨_ Physics.

Khan Academy is a nonprofit organization with the mission of providing a free, world-class education for anyone, anywhere. We offer quizzes, questions, instructional videos, and articles on a range of academic subjects, including math, biology, chemistry, physics, history, economics, finance, grammar, preschool learning, and more. We provide teachers with tools and data so they can help their students develop the skills, habits, and mindsets for success in school and beyond. Khan Academy has been translated into dozens of languages, and 15 million people around the globe learn on Khan Academy every month. As a 501(c)(3) nonprofit organization, we would love your help! Donate or volunteer today!

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Lesson 17 (Waves, Light, and Sound) of Dianna's Intro Physics Class on Physics Girl. Never taken physics before? Want to learn the basics of physics? Need a review of AP Physics concepts before the exam? This course is for you!

Exercises in this video:
1. You measure an oscillating wave to have a wavelength of .5m and a frequency of .5Hz. What is the speed of the wave in that medium? What would the wavelength of a wave with frequency 2.5Hz be?

2. You tune your car radio to your favorite station, 93.5 on the dial. That’s a frequency of 93.5MHz. What is the wavelength of that radio wave?

3. At sea level, the speed of sound in air is around 343m/s. The speed of light in air is about 3.00x10^8m/s. If you are watching a rocket launch 11km away, what will be the difference between the time you see the launch and the time you hear it?


Credits:
Dianna Cowern - Executive Producer/Host/Writer
Jeff Brock - Lead Writer/Course Designer
Laura Chernikoff - Producer
Rachel Watson - Video Editor
AP Curriculum Consultant - Bryn Bishop
Sophia Chen - Researcher/Writer
Erika K. Carlson - Researcher/Writer
Hope Butner - Production Assistant
Levi Butner - Videographer
Lauren Ivy - Set Design
Vanessa Hill - Consulting Producer
Aleeza McCant - Illustrator
Rachel Allen - Illustrator
Consultant - Kyle Kitzmiller
Lucy Brock, Samantha Ward - Curriculum Consultants
Cathy Cowern - Transcription

Courses on Khan Academy are always 100% free. Start practicing—and saving your progress—now: https://www.khanacademy.org/sc....ience/high-school-ph

Using a one-dimensional number line to visualize and calculate distance and displacement.

View more lessons or practice this subject at http://www.khanacademy.org/science/ap-physics-1/ap-one-dimensional-motion/distance-displacement-and-coordinate-systems/v/distance-and-displacement-in-one-dimension?utm_source=youtube&utm_medium=desc&utm_campaign=apphysics1

AP Physics 1 on Khan Academy: Meet one of our writers for AP¨_ Physics, Sean. A physics teacher for seven years, Sean has taught AP¨_ Physics 1, AP¨_ Physics C, and Conceptual Physics. HeÕs also a former mechanical engineer. Sean is based in Boise, Idaho, and is a Khan Academy physics fellow, creating awesome new exercises and articles for AP¨_ Physics.

Khan Academy is a nonprofit organization with the mission of providing a free, world-class education for anyone, anywhere. We offer quizzes, questions, instructional videos, and articles on a range of academic subjects, including math, biology, chemistry, physics, history, economics, finance, grammar, preschool learning, and more. We provide teachers with tools and data so they can help their students develop the skills, habits, and mindsets for success in school and beyond. Khan Academy has been translated into dozens of languages, and 15 million people around the globe learn on Khan Academy every month. As a 501(c)(3) nonprofit organization, we would love your help! Donate or volunteer today!

Donate here: https://www.khanacademy.org/donate?utm_source=youtube&utm_medium=desc

Volunteer here: https://www.khanacademy.org/contribute?utm_source=youtube&utm_medium=desc

Review of the Mechanical Waves topics covered in the AP Physics 1 curriculum.
Want Lecture Notes? http://www.flippingphysics.com..../ap1-waves-review.ht

0:00 Intro
0:13 Wave definition
1:26 Transverse and longitudinal waves
3:15 Graphing waves
4:50 Deriving the velocity of a wave
6:06 Superposition of waves
6:43 Constructive Interference
7:37 Total destructive interference
8:34 Reflection and inversion
9:09 Standing Waves on a string with nodes and antinodes
10:09 Deriving frequency and wavelength for standing waves
11:45 Frequency for a stringed and open pipe instrument
12:12 The harmonic number
13:36 Closed pipe wind instrument
15:08 Beat frequency demonstration
16:33 The Doppler effect

Next Video:
AP Physics 1: Electrostatics Review
http://www.flippingphysics.com..../ap1-electrostatics-

Multilingual? Please help translate Flipping Physics videos!
http://www.flippingphysics.com/translate.html
- Los subtítulos de este video de "Flipping Physics" han sido traducidos al Español. Gracias Anwar Delgado Silva!
- 本Flipping Physics视频已有中文字幕。谢谢Erica Hu!
- Οι υπότιτλοι αυτού του Flipping Physics video έχουν μεταφραστεί στα Ελληνικά . Ευχαριστώ τον Ζορμπά Στέφανο !

Previous Video:
AP Physics 1: Simple Harmonic Motion Review
http://www.flippingphysics.com/ap1-shm-review.html

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Audio Tool is the iOs app used in the video.
http://www.performanceaudio.com/apps/

Here is a web based frequency generator:
http://www.szynalski.com/tone-generator/

And an Android frequency generator:
https://en.softonic.com/soluti....ons/apps/frequency-g

#APPhysics1 #Review #Waves

Looking for AP Physics 1 study guides, multiple choice problems, free response question solutions and a practice exam? https://www.ultimatereviewpack....et.com/courses/ap-ph


Review of the Universal Gravitation topics covered in the AP Physics 1 curriculum.
Want Lecture Notes? http://www.flippingphysics.com..../ap1-gravitation-rev

0:00 Intro
0:14 Newton’s Universal Law of Gravitation
1:20 When to use the Two Force of Gravity equations
1:52 Solving for the acceleration due to gravity
2:45 Local and Global Gravitational Fields
3:34 Orbiting Satellite Example
5:03 Universal Gravitational Potential Energy
6:19 Why Universal Gravitational Potential Energy is less than or equal to zero
7:47 Must have two objects for gravitational potential energy

Gracias a Mehul Verma, Mauricio Escobar y Adrian Mosquera por editar las traducciones al español de este video.

This video has been dubbed using an artificial voice via https://aloud.area120.google.com to increase accessibility. You can change the audio track language in the Settings menu.
- Los subtítulos de este video de "Flipping Physics" han sido traducidos al Español. Gracias Anwar Delgado Silva!
- Οι υπότιτλοι αυτού του Flipping Physics video έχουν μεταφραστεί στα Ελληνικά . Ευχαριστώ τον Ζορμπά Στέφανο !

Next Video:
AP Physics 1: Simple Harmonic Motion Review
http://www.flippingphysics.com/ap1-shm-review.html

Previous Video:
AP Physics 1: Rotational Kinematics Review
http://www.flippingphysics.com..../ap1-rotational-kine

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#APPhysics1 #Review #UniversalGravitation

Visit http://ilectureonline.com for more math and science lectures!

In this video I will explain the products of vectors, or dot product, or scalar product.

Next video in this series can be seen at:
https://youtu.be/ffAzfVYgDII

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At Xylem Plus One, we understand the stress and pressure students face when preparing for their annual exams. That's why we have created a series of full chapter revision videos designed to help students thoroughly review each topic in the curriculum. Our experienced teachers cover all the important concepts and provide detailed explanations to ensure a complete understanding of the material.
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Courses on Khan Academy are always 100% free. Start practicing—and saving your progress—now: https://www.khanacademy.org/sc....ience/in-in-class11t

Sal defines and compares tension, weight, friction and normal forces using free body diagrams.

View more lessons or practice this subject at https://www.khanacademy.org/science/ap-physics-1/ap-forces-newtons-laws/introduction-to-forces-and-free-body-diagrams-ap/v/types-of-forces-and-free-body-diagrams?utm_source=youtube&utm_medium=desc&utm_campaign=apphysics1

AP Physics 1 on Khan Academy: Meet one of our writers for AP¨_ Physics, Sean. A physics teacher for seven years, Sean has taught AP¨_ Physics 1, AP¨_ Physics C, and Conceptual Physics. HeÕs also a former mechanical engineer. Sean is based in Boise, Idaho, and is a Khan Academy physics fellow, creating awesome new exercises and articles for AP¨_ Physics.

Khan Academy is a nonprofit organization with the mission of providing a free, world-class education for anyone, anywhere. We offer quizzes, questions, instructional videos, and articles on a range of academic subjects, including math, biology, chemistry, physics, history, economics, finance, grammar, preschool learning, and more. We provide teachers with tools and data so they can help their students develop the skills, habits, and mindsets for success in school and beyond. Khan Academy has been translated into dozens of languages, and 15 million people around the globe learn on Khan Academy every month. As a 501(c)(3) nonprofit organization, we would love your help! Donate or volunteer today!

Donate here: https://www.khanacademy.org/donate?utm_source=youtube&utm_medium=desc

Volunteer here: https://www.khanacademy.org/contribute?utm_source=youtube&utm_medium=desc

This clip is an extraction from well known MIT course 8.01 taken by Prof. Walter Lewin. You can find full lectures on his own channel.