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I am confused about problem number seven part b in this pdf. http://aplusphysics.com/ap1/Problems/AP1 Momentum.pdf I read the given answer, and I am still confused. I don't know how you are supposed to get 0 m/s for the velocity of the block. Why do you use negative impulse for the block when you use positive impulse for the sphere? When do you use negative impulse? Why don't you use the mass of the entire system, which would be the block and the ball? This has to do with it being elastic/inelastic, but I don't know how you can tell from an impulse graph. Help??

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Walkthrough of the 2017 AP Physics 1 Free Response Questions. Questions can be found at https://securemedia.collegeboard.org...For more information, please visit http://aplusphysics.com*AP and Advanced Placement Program are registered trademarks of the College Board, which does not sponsor or endorse this work.

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Video Discussion: AP Physics 1 2017 Free Response Solutions
FizziksGuy posted a topic in AP Physics 1/2
Name: AP Physics 1 2017 Free Response Solutions Category: Exam Prep Date Added: 20170820 Submitter: FizziksGuy Walkthrough of the 2017 AP Physics 1 Free Response Questions. Questions can be found at https://securemedia.collegeboard.org...For more information, please visit http://aplusphysics.com*AP and Advanced Placement Program are registered trademarks of the College Board, which does not sponsor or endorse this work. AP Physics 1 2017 Free Response Solutions
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In the following diagram, a force F acts on a cart in motion on a frictionless surface. The initial and final velocities of each cart are shown. Rank the energy required to change each cart's velocity from greatest to least. A: Weighs 2 kg, 5 m/s to 2 m/s  Change in KE = 1/2*2*(2*25*5) J = 21 J B: Weighs 3 kg, 3 m/s to 3 m/s  Change in KE = 1/2*3*(3*3(3)*(3)) J = 0 J C: Weighs 5 kg, 5 m/s to 6 m/s  Change in KE = 1/2*5*(6*65*5) J = 27.5 J D: Weighs 4 kg, 1 m/s to 2 m/s  Change in KE = 1/2*4*(2*2(1)*(1)) J = 6 J The answer says that the ranking is C, B, A, D, which doesn't make any sense to me given the calculations I made. Can someone please explain what I did wrong, or clarify the question?

Chapter 7: Circular Motion and Rotation Test Your Understanding
veevian posted a question in Homework Help
In the AP Physics I Essentials book, I'm a little bit stuck on question 5 for Chapter 7 Test Your Understanding. The problem states "A marble is rolled separately down two different inclines of the same height as shown below. Compare the speed of the marble at the bottom of incline A to the speed of the marble at the bottom of incline B. Compare the time it takes the marble to reach the bottom of incline A to the time it takes to reach the bottom of incline B." There is also a picture with a ball on top of an incline that is straight, and another picture with a ball on top of an incline that is curved. I can explain why incline B would result in greater speed resulting in faster time due to the cycloid path/Brachistochrone Curve since the marble is aided by gravity and the beginning is steeper so more PE to KE for incline B etc. etc., but I can't explain it mathematically (w/equations and all). I tried using WorkEnergy theorem, but that didn't really work...Also, I'm confused on how we connect the concepts of angular motion to this problem. I appreciate the help! 
A 0.15kilogram baseball moving at 20 m/s is stopped by a catcher in 0.010 seconds. The average force stopping the ball is: (A) 3.0x10^2 N (B) 3.0X10^0 N (C) 3.0X10^1 N (D) 3.0X10^2 N The explanation says that it takes 0.010 seconds for the baseball to accelerate from 0 m/s to 20 m/s, but that doesn't really match up with the question... Is the wording a little weird?

Walkthrough of the 2016 AP Physics 1 Free Response Questions. Questions can be found at http://apcentral.collegeboard.com/apc/members/exam/exam_information/225288.html. *AP and Advanced Placement Program are registered trademarks of the College Board, which does not sponsor or endorse this work.
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Name: AP Physics 1 2016 FRQ Solutions Category: Exam Prep Date Added: 20160508 Submitter: FizziksGuy Walkthrough of the 2016 AP Physics 1 Free Response Questions. Questions can be found at http://apcentral.collegeboard.com/apc/members/exam/exam_information/225288.html. *AP and Advanced Placement Program are registered trademarks of the College Board, which does not sponsor or endorse this work. AP Physics 1 2016 FRQ Solutions

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Brief introduction to angular momentum for algebrabased physics courses such as AP Physics 1.

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Name: AP Physics 1  Angular Momentum Category: Rotational Motion Date Added: 20151119 Submitter: FizziksGuy Brief introduction to angular momentum for algebrabased physics courses such as AP Physics 1. AP Physics 1  Angular Momentum

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Determining the Static Coefficient of Friction between Tires and Snow
Flipping Physics posted a video in Dynamics
We use Newton’s Second Law and Uniformly Accelerated Motion to experimentally determine the Static Coefficient of Friction between Tires and Snow. Want Lecture Notes? This is an AP Physics 1 topic. Content Times: 0:09 Reading and translating the problem 1:03 Visualizing the experiment 1:16 Where to begin? 1:45 Drawing the Free Body Diagram 3:09 Summing the forces in the ydirection 4:47 Summing the forest in the xdirection 6:24 Uniformly Accelerated Motion 7:35 Solving for the coefficient of static friction 8:18 All 9 trials Next Video: Breaking the Force of Gravity into its Components on an Incline Multilingual? Please help translate Flipping Physics videos! Previous Video: Everybody Brought Mass to the Party! 1¢/minute
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Video Discussion: Determining the Static Coefficient of Friction between Tires and Snow
Flipping Physics posted a topic in Video Discussions
Name: Determining the Static Coefficient of Friction between Tires and Snow Category: Dynamics Date Added: 20151008 Submitter: Flipping Physics We use Newton’s Second Law and Uniformly Accelerated Motion to experimentally determine the Static Coefficient of Friction between Tires and Snow. Want Lecture Notes? This is an AP Physics 1 topic. Content Times: 0:09 Reading and translating the problem 1:03 Visualizing the experiment 1:16 Where to begin? 1:45 Drawing the Free Body Diagram 3:09 Summing the forces in the ydirection 4:47 Summing the forest in the xdirection 6:24 Uniformly Accelerated Motion 7:35 Solving for the coefficient of static friction 8:18 All 9 trials Next Video: Breaking the Force of Gravity into its Components on an Incline Multilingual? Please help translate Flipping Physics videos! Previous Video: Everybody Brought Mass to the Party! 1¢/minute Determining the Static Coefficient of Friction between Tires and Snow 
Video Discussion: Does the Book Move? An Introductory Friction Problem
Flipping Physics posted a topic in Video Discussions
Name: Does the Book Move? An Introductory Friction Problem Category: Dynamics Date Added: 20150819 Submitter: Flipping Physics Determine if the book moves or not and the acceleration of the book. It’s all about static and kinetic friction. Want Lecture Notes? This is an AP Physics 1 topic. Content Times: 0:08 Reading and translating the problem 0:57 5 Steps to help solve any Free Body Diagram problem 1:26 Drawing the Free Body Diagram 2:24 Sum the forces in the ydirection 3:22 Sum the forces in the xdirection 4:56 The answer to part (a) 6:22 Solving part (b) Multilingual? Please help translate Flipping Physics videos! Previous Video: Experimentally Graphing the Force of Friction 1¢/minute Does the Book Move? An Introductory Friction Problem 
Determine if the book moves or not and the acceleration of the book. It’s all about static and kinetic friction. Want Lecture Notes? This is an AP Physics 1 topic. Content Times: 0:08 Reading and translating the problem 0:57 5 Steps to help solve any Free Body Diagram problem 1:26 Drawing the Free Body Diagram 2:24 Sum the forces in the ydirection 3:22 Sum the forces in the xdirection 4:56 The answer to part (a) 6:22 Solving part (b) Multilingual? Please help translate Flipping Physics videos! Previous Video: Experimentally Graphing the Force of Friction 1¢/minute

Video Discussion: Experimentally Graphing the Force of Friction
Flipping Physics posted a topic in Video Discussions
Name: Experimentally Graphing the Force of Friction Category: Dynamics Date Added: 20150819 Submitter: Flipping Physics To help understand the force of friction, mr.p pulls on a wooden block using a force sensor. Want Lecture Notes? This is an AP Physics 1 topic. Content Times: 0:17 Drawing the Free Body Diagram 0:43 Summing the forces in the xdirection 1:21 Graph when the block doesn’t move 1:46 Graph with the block moving Next Video: Does the Book Move? An Introductory Friction Problem Multilingual? Please help translate Flipping Physics videos! Previous Video: Understanding the Force of Friction Equation 1¢/minute Experimentally Graphing the Force of Friction
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To help understand the force of friction, mr.p pulls on a wooden block using a force sensor. Want Lecture Notes? This is an AP Physics 1 topic. Content Times: 0:17 Drawing the Free Body Diagram 0:43 Summing the forces in the xdirection 1:21 Graph when the block doesn’t move 1:46 Graph with the block moving Next Video: Does the Book Move? An Introductory Friction Problem Multilingual? Please help translate Flipping Physics videos! Previous Video: Understanding the Force of Friction Equation 1¢/minute

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Bobby teaches the basics of friction and the differences between Static and Kinetic Friction. Want Lecture Notes? This is an AP Physics 1 topic. Content Times: 0:11 Basic definition of friction 0:40 What causes friction? 1:30 Static and kinetic friction demonstrated 2:10 Friction is independent of surface area 2:47 The direction of the force of friction Multilingual? Please help translate Flipping Physics videos! Next Video: Introduction to the Coefficient of Friction Previous Video: An Introductory Tension Force Problem 1¢/minute

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Video Discussion: Introduction to Static and Kinetic Friction by Bobby
Flipping Physics posted a topic in Video Discussions
Name: Introduction to Static and Kinetic Friction by Bobby Category: Dynamics Date Added: 20150807 Submitter: Flipping Physics Bobby teaches the basics of friction and the differences between Static and Kinetic Friction. Want Lecture Notes? This is an AP Physics 1 topic. Content Times: 0:11 Basic definition of friction 0:40 What causes friction? 1:30 Static and kinetic friction demonstrated 2:10 Friction is independent of surface area 2:47 The direction of the force of friction Multilingual? Please help translate Flipping Physics videos! Next Video: Introduction to the Coefficient of Friction Previous Video: An Introductory Tension Force Problem 1¢/minute Introduction to Static and Kinetic Friction by Bobby 
Learn how to solve a basic tension force problem with demonstration! Want Lecture Notes? This is an AP Physics 1 topic. Content Times: 0:00 The Problem Demonstrated 0:29 5 Steps to Solve and Free Body Diagram Problem 0:50 Drawing the Free Body Diagram 2:03 Resolving Tension Force 1 into its components (numbers dependency) 4:00 Introducing the Equation Holster! 5:11 Redraw the Free Body Diagram 5:32 Sum the forces in the ydirection 7:24 Sum the forces in the xdirection 8:29 Demonstrating our solution is correct Multilingual? Please help translate Flipping Physics videos! Next Video: Introduction to Static and Kinetic Friction by Bobby Previous Video: 5 Steps to Solve any Free Body Diagram Problem 1¢/minute

Video Discussion: An Introductory Tension Force Problem
Flipping Physics posted a topic in Video Discussions
Name: An Introductory Tension Force Problem Category: Dynamics Date Added: 20150730 Submitter: Flipping Physics Learn how to solve a basic tension force problem with demonstration! Want Lecture Notes? This is an AP Physics 1 topic. Content Times: 0:00 The Problem Demonstrated 0:29 5 Steps to Solve and Free Body Diagram Problem 0:50 Drawing the Free Body Diagram 2:03 Resolving Tension Force 1 into its components (numbers dependency) 4:00 Introducing the Equation Holster! 5:11 Redraw the Free Body Diagram 5:32 Sum the forces in the ydirection 7:24 Sum the forces in the xdirection 8:29 Demonstrating our solution is correct Multilingual? Please help translate Flipping Physics videos! Next Video: Introduction to Static and Kinetic Friction by Bobby Previous Video: 5 Steps to Solve any Free Body Diagram Problem 1¢/minute An Introductory Tension Force Problem 
Video Discussion: 5 Steps to Solve any Free Body Diagram Problem
Flipping Physics posted a topic in Video Discussions
Name: 5 Steps to Solve any Free Body Diagram Problem Category: Dynamics Date Added: 20150730 Submitter: Flipping Physics Learn how to solve problems that have Free Body Diagrams! Want Lecture Notes? This is an AP Physics 1 topic. Content Times: 0:15 Step 1) Draw the Free Body Diagram 0:50 Step 2) Break Forces into Components 1:37 Step 3) Redraw the Free Body Diagram 2:15 Step 4) Sum the Forces 2:45 Step 5) Sum the Forces (again) 3:13 Review the 5 Steps Multilingual? Please help translate Flipping Physics videos! Next Video: An Introductory Tension Force Problem Previous Video: Introduction to Equilibrium 1¢/minute: http://www.flippingphysics.com/give.html 5 Steps to Solve any Free Body Diagram Problem 
Learn how to solve problems that have Free Body Diagrams! Want Lecture Notes? This is an AP Physics 1 topic. Content Times: 0:15 Step 1) Draw the Free Body Diagram 0:50 Step 2) Break Forces into Components 1:37 Step 3) Redraw the Free Body Diagram 2:15 Step 4) Sum the Forces 2:45 Step 5) Sum the Forces (again) 3:13 Review the 5 Steps Multilingual? Please help translate Flipping Physics videos! Next Video: An Introductory Tension Force Problem Previous Video: Introduction to Equilibrium 1¢/minute: http://www.flippingphysics.com/give.html

Name: Introduction to Equilibrium Category: Dynamics Date Added: 20150730 Submitter: Flipping Physics Learn about and see examples of Translational Equilibrium. Want Lecture Notes? This is an AP Physics 1 topic. Content Times: 0:11 What happens to an object in equilibrium? 0:40 Using Newton’s 2nd law to describe what happens… 2:16 Example: Book at rest on an incline 2:45 Example: Car moving at a constant velocity 3:18 Translational equilibrium Multilingual? Please help translate Flipping Physics videos! Next Video: 5 Steps to Solve any Free Body Diagram Problem Previous Video: Understanding the Force of Tension 1¢/minute Introduction to Equilibrium

Learn about and see examples of Translational Equilibrium. Want Lecture Notes? This is an AP Physics 1 topic. Content Times: 0:11 What happens to an object in equilibrium? 0:40 Using Newton’s 2nd law to describe what happens… 2:16 Example: Book at rest on an incline 2:45 Example: Car moving at a constant velocity 3:18 Translational equilibrium Multilingual? Please help translate Flipping Physics videos! Next Video: 5 Steps to Solve any Free Body Diagram Problem Previous Video: Understanding the Force of Tension 1¢/minute

Equations to memorize for the AP Physics 1 Exam. Want [url="http://www.flippingphysics.com/ap1equationsreview.html"]Lecture Notes[/url]? Content Times: 0:13 What I mean by â€œMemorizeâ€ 1:09 Speed, velocity and acceleration 1:51 Missing UAM Equation 2:03 Force of gravity on an incline 2:23 Mechanical Energy equations 2:58 Power 3:35 Conservation of Linear Momentum 3:57 Angular velocity, angular acceleration and 2 UÎ±M equations 4:30 Tangential velocity and Rolling without Slipping center of mass velocity 5:05 Centripetal Force 5:26 Moment of Inertia 5:52 Conservation of Angular Momentum 6:21 Beat Frequency 6:31 Net charge 6:39 Electric Potential Difference 6:55 Electric Power Multilingual? [url="http://www.flippingphysics.com/translate.html"]Please help translate Flipping Physics videos[/url]! All my [url="http://www.flippingphysics.com/apphysics1review.html"]AP Physics 1 Review Videos[/url] [url="http://www.flippingphysics.com/give.html"]1Â¢/minute[/url]
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