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Name: AP Physics C: Dynamics Review (Mechanics) Category: Dynamics Date Added: 20170323 Submitter: Flipping Physics Calculus based review of Newton’s three laws, basic forces in dynamics such as the force of gravity, force normal, force of tension, force applied, force of friction, free body diagrams, translational equilibrium, the drag or resistive force and terminal velocity. For the calculus based AP Physics C mechanics exam. Want Lecture Notes? Content Times: 0:18 Newton’s First Law 1:30 Newton’s Second Law 1:55 Newton’s Third Law 2:29 Force of Gravity 3:36 Force Normal 3:58 Force of Tension 4:24 Force Applied 4:33 Force of Friction 5:46 Static Friction 6:17 Kinetic Friction 6:33 The Coefficient of Friction 7:26 Free Body Diagrams 10:41 Translational equilibrium 11:41 Drag Force or Resistive Force 13:25 Terminal Velocity Next Video: AP Physics C: Work, Energy, and Power Review (Mechanics) Multilingual? Please help translate Flipping Physics videos! AP Physics C Review Website Previous Video: AP Physics C: Kinematics Review (Mechanics) Please support me on Patreon! Thank you to Aarti Sangwan for being my Quality Control help. AP Physics C: Dynamics Review (Mechanics)

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Name: Do Antilock Brakes use Static or Kinetic Friction? by Billy Category: Dynamics Date Added: 20160630 Submitter: Flipping Physics Billy analyzes ABS brakes to show the difference between Rolling without Slipping and Rolling with Slipping. He also answers the question in the title of the video, but why would I write that in the description? Want Lecture Notes? This is an AP Physics 1 Topic. Content Times: 0:17 ABS Brakes 0:40 Demonstrating Rolling without Slipping and Rolling with Slipping 1:36 How ABS Brakes work 2:18 Analyzing a car tire 3:34 The calculations Next Video: Everybody Brought Mass to the Party! Multilingual? Please help translate Flipping Physics videos! Previous Video: Does the Book Move? An Introductory Friction Problem Please support me on Patreon! Do Antilock Brakes use Static or Kinetic Friction? by Billy

Name: Introductory Kinetic Friction on an Incline Problem Category: Dynamics Date Added: 20160616 Submitter: Flipping Physics You place a book on a 14° incline and then let go of the book. If the book takes 2.05 seconds to travel 0.78 meters, what is the coefficient of kinetic friction between the book and the incline? Want Lecture Notes? This is an AP Physics 1 Topic. Content Times: 0:01 The example 0:13 Listing the known values 1:09 Drawing the free body diagram 1:58 Net force in the perpendicular direction 2:34 Net force in the parallel direction 4:03 Solving for acceleration 5:07 Solving for Mu 5:40 We made a mistake Multilingual? Please help translate Flipping Physics videos! Previous Video: Introductory Static Friction on an Incline Problem Please support me on Patreon! Introductory Kinetic Friction on an Incline Problem

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Name: Calculating the Uncertainty of the Coefficient of Friction Category: Dynamics Date Added: 20160616 Submitter: Flipping Physics 10 trials to calculate the coefficient of static friction and how to calculate the uncertainty of this measurement. More details about Standard Deviation is in the lecture notes. This is an AP Physics 1 Topic. Next Video: Introductory Kinetic Friction on an Incline Problem Multilingual? Please help translate Flipping Physics videos! Previous Video: Introductory Static Friction on an Incline Problem Please support me on Patreon! Calculating the Uncertainty of the Coefficient of Friction

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Name: Introductory Static Friction on an Incline Problem Category: Dynamics Date Added: 20160613 Submitter: Flipping Physics A book is resting on a board. One end of the board is slowly raised. The book starts to slide when the incline angle is 15°. What is the coefficient of static friction between the book and the incline? Want Lecture Notes? This is an AP Physics 1 Topic. Content Times: 0:01 The example 0:44 Drawing the free body diagram 1:41 Net force in the parallel direction 2:11 Demonstrating why the acceleration in the parallel direction is zero 3:58 Force normal does not equal force of gravity 4:32 Net force in the perpendicular direction 5:07 Return to the parallel direction 6:06 Substituting in numbers Next Video: Calculating the Uncertainty of the Coefficient of Friction Multilingual? Please help translate Flipping Physics videos! Previous Video: Physics "Magic Trick" on an Incline Please support me on Patreon! Introductory Static Friction on an Incline Problem

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Name: Introductory Work due to Friction equals Change in Mechanical Energy Problem Category: Work, Energy, Power Date Added: 20160212 Submitter: Flipping Physics The equation Work due to Friction equals Change in Mechanical Energy can often be confusing for students. This video is a stepbystep introduction in how to use the formula to solve a problem. Want Lecture Notes? This is an AP Physics 1 topic. Content Times: 0:09 The problem 1:29 Why we can use this equation in this problem 1:52 Expanding the equation 2:29 Identifying Initial and Final Points and the Horizontal Zero Line 3:00 Substituting into the left hand side of the equation 4:05 Deciding which Mechanical Energies are present 4:59 Where did all that Kinetic Energy go? 5:27 Identifying which variables we know and do not know 5:58 Solving for the Force Normal 6:57 Substituting Force Normal back into the original equation 8:09 Why isn’t our answer negative? Next Video: Work due to Friction equals Change in Mechanical Energy Problem by Billy Multilingual? Please help translate Flipping Physics videos! Previous Video: Introduction to Mechanical Energy with Friction 1¢/minute Introductory Work due to Friction equals Change in Mechanical Energy Problem

Name: Introduction to Mechanical Energy with Friction Category: Work, Energy, Power Date Added: 20160208 Submitter: Flipping Physics Learn how to use Mechanical Energy when the Work done by Friction does not equal zero. Want Lecture Notes? This is an AP Physics 1 topic. Content Times: 0:09 When is Conservation of Mechanical energy true? 0:37 Work due to Friction equals the Change in Mechanical Energy 1:57 Determining the angle in the work equation 3:01 When the angle is not 180 degrees 3:50 What if the work done by friction is zero? 4:31 Always identify … Next Video: Introductory Work due to Friction equals Change in Mechanical Energy Problem Multilingual? Please help translate Flipping Physics videos! Previous Video: The Energy Song by Bo 1¢/minute Introduction to Mechanical Energy with Friction

Name: Conservation of Energy Problem with Friction, an Incline and a Spring by Billy Category: Work, Energy, Power Date Added: 20160114 Submitter: Flipping Physics Billy helps you review Conservation of Mechanical Energy, springs, inclines, and uniformly accelerated motion all in one example problem. Want Lecture Notes? This is an AP Physics 1 topic. Content Times: 0:10 The problem 0:38 Listing the known values 1:40 Using Conservation of Mechanical Energy 2:56 Canceling out the Mechanical Energies which are not there 4:18 Drawing the Free Body Diagram 4:52 Summing the forces in the perpendicular direction 5:26 Summing the forces in the parallel direction 6:59 Using Uniformly Accelerated Motion 7:56 Finding the maximum height Next Video: Work due to the Force of Gravity on an Incline by Billy Multilingual? Please help translate Flipping Physics videos! Previous Video: Introductory Conservation of Mechanical Energy Problem using a Trebuchet 1¢/minute Conservation of Energy Problem with Friction, an Incline and a Spring by Billy

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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

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

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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Name: Understanding the Force of Friction Equation Category: Dynamics Date Added: 20150818 Submitter: Flipping Physics The Force of Friction Equation is actually three equations is one. Learn why! Want Lecture Notes? This is an AP Physics 1 topic. Content Times: 0:00 The basic Force of Friction Equation 0:20 One Kinetic Friction Equation 0:39 The Two Static Friction Equations 1:40 Example Free Body Diagram 2:16 The direction of the Force of Friction 3:20 Determining the magnitude of the Force of Static Friction 4:09 Understanding the “less than or equal” sign 6:08 If the “less than or equal” sign were not there Next Video: Experimentally Graphing the Force of Friction Multilingual? Please help translate Flipping Physics videos! Previous Video: Introduction to the Coefficient of Friction 1¢/minute Understanding the Force of Friction Equation

Name: Introduction to the Coefficient of Friction Category: Dynamics Date Added: 20150809 Submitter: Flipping Physics Please do not confuse the Coefficient of Friction with the Force of Friction. This video will help you not fall into that Pit of Despair! Want Lecture Notes? This is an AP Physics 1 topic. Content Times: 0:00 The equation for the Force of Friction 0:17 Mu, the symbol for the Coefficient of Friction 1:21 Tables of Coefficients of Friction 2:49 Comparing the values of static and kinetic coefficients of friction 3:54 A typical range of values Next Video: Understanding the Force of Friction Equation Multilingual? Please help translate Flipping Physics videos! Previous Video: Introduction to Static and Kinetic Friction by Bobby 1¢/minute Introduction to the Coefficient of Friction

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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

Name: Work, Energy and Power Review for AP Physics 1 Category: Exam Prep Date Added: 13 March 2015  08:25 AM Submitter: Flipping Physics Short Description: None Provided Review of the topics of Work, Energy, Power and Hookeâ€™s Law covered in the AP Physics 1 curriculum. Content Times: 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 Hookeâ€™s Law Multilingual? View Video

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Video Discussion: Dynamics Review for AP Physics 1
Flipping Physics posted a topic in AP Physics 1/2
Name: Dynamics Review for AP Physics 1 Category: Exam Prep Date Added: 09 March 2015  09:36 AM Submitter: Flipping Physics Short Description: None Provided Review of all of the Dynamics topics covered in the AP Physics 1 curriculum. Content Times: 0:18 Inertial Mass vs. Gravitational Mass 1:14 Newtonâ€™s First Law of Motion 2:20 Newtonâ€™s Second Law of Motion 3:17 Free Body Diagrams 4:29 Force of Gravity or Weight 4:41 Force Normal 5:32 Force of Friction 7:32 Newtonâ€™s Third Law of Motion 8:20 Inclines 9:41 Translational Equilibrium Multilingual? View Video 
Name: Using Newton's Second Law to find the Force of Friction Category: Dynamics Date Added: 12 January 2015  11:59 AM Submitter: Flipping Physics Short Description: None Provided In order to use Newtonâ€™s Second Law, you need to correctly draw the Free Body Diagram. This problem explains a common mistake students make involving the force applied. We also review how to find acceleration on a velocity as a function of time graph. Content Times: 0:22 The problem 0:54 Listing our known values 1:51 Drawing the Free Body Diagram 2:17 A common mistake in our Free Body Diagram 3:32 Solving the problem 4:14 Another common mistake 5:07 Why is the acceleration positive? Multilingual? View Video

Name: Introduction to Free Body Diagrams or Force Diagrams Category: Dynamics Date Added: 13 November 2014  09:53 AM Submitter: Flipping Physics Short Description: None Provided We define and discuss how to draw Free Body Diagrams which are also called Force Diagrams. In addition we define the force normal and the force applied. Force of friction and center of mass are briefly discussed, however, a much more detailed discussion of each is left for later lessons. Free Body Diagrams are drawn on a level surface and on an incline. Content Times: 0:12 Defining Free Body Diagram or Force Diagram 0:46 Center of mass 1:13 The force of gravity 2:08 The force normal 3:28 Adding a force applied 4:02 The force of friction 4:53 Adding an incline 5:54 The force of friction caused by the incline Multilingual? View Video

Name: Do Your Feet Affect How Far You Slide on a Water Slide? Category: Dynamics Date Added: 22 October 2014  01:39 PM Submitter: Flipping Physics Short Description: None Provided If you hold your feet flat or point them, does it change how far you slide. This video shows the answer and explains why using the concept of drag force. Content Times: 0:26 Showing the two foot positions 0:57 Defining aerodynamic 1:41 Defining the Drag Force 2:32 A closer look at the cross sectional area 4:04 Showing the answer 5:05 Comparing splashes 5:43 A second demonstration 6:22 Many thanks Multilingual? View Video

Today was one of those days when all the roads were covered in snow, which is bad for driving and even worse for running. A few steps in that salty slush and you'll be slipping all over the place. What I've found is that snow sticks to the bottom of my shoes and stays there, so rather than my rubber soles trying to get traction with snow, there is just more snow trying to get traction with the snow. This drastically reduces the coefficient of static friction between my shoes and the road, causing my feet to slip every step which gets really annoying after about 20 feet. Also less frictional force means less effect from newton's third law and more energy wasted every step making running a tedious task at best.

The Benefit of Antilock Brakes
pavelow posted a blog entry in Blog Having Nothing to do with Physics
Bob is barreling down the thruway in his truck at 40 m/s when a crash occurs in front of it. The driver wants to stop in the shortest distance possible. He slams on the brakes. Before the invention and implementation of the Antilock brake system, or ABS, the truck's tires would have locked up and the truck would have slid into the crash. Why? When brakes cause tires to lock up, the type of friction between the tires and road changes from static friction to kinetic friction. This decreases the total force of friction between the surfaces. Because of the decrease in force opposing the truck's motion, the truck cannot stop in a short distance. How does the ABS prevent this? The Antilock brake system prevents the tires from locking up. Therefore, the type of friction between the tires and the road is always static, the strongest type of friction. The implementation of ABS into modern cars and trucks has prevented crashes from panicked drivers, such as Bob, by allowing them to come to a complete stop in shorter distances than before possible, even better than experienced drivers using advanced braking techniques without ABS. 
When taking corners quickly, the biggest worry most drivers should have is slipping and losing control of the car. This happens when a driver takes the corner too fast. The physics of taking a flat corner depends on the equation vmax = Sqrt(mu*r*g). mu, the coefficient of static friction, is constant, as is g, the acceleration due to gravity. Therefore, a driver trying to take a corner as quickly as possible would like to make the radius of the turn as large as possible to allow for a higher vmax, keeping his car from slipping at higher speeds. But how? Doesn't a road have a defined radius? Yes, and no. The picture explains it. The arrow in the figure is what's called a "line" this is the best possible way for a car to take a corner at the highest speed. The line a regular driver would take is very curved, mimicking the road, and not allowing for a high vmax due to the small radius. A race car driver would take a better line. The racer's line is significantly less curved than the regular driver's line, making the radius much larger, allowing for a higher vmax . The racecar driver starts and ends wide of the inside and hits the apex of the turn, allowing for the least curved line possible. To conclude, when trying to take a corner quickly, the driver of the car should start out wide, hit the apex, and end wide, causing a relatively high radius and a relatively high vmax, without having the car slip off the road.

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We are having trouble understanding the concept of question number 13 below: (we figured out the first ones OK) Base your answers to questions 9 through 13 on the information below. A manufacturer’s advertisement claims that their 1,250kilogram (12,300newton) sports car can accelerate on a level road from 0 to 60 miles per hour (0 to 26.8 meters per second) in 3.75 seconds. 9. Determine the acceleration, in meters per second2, of the car according to the advertisement. 10. Calculate the net force required to give the car the acceleration claimed in the advertisement. [show all work, including the equation and substitution with units.] 11. What is the normal force exerted by the road on the car? 12. The coefficient of friction between the car’s tires and the road is 0.80. Calculate the maximum force of friction between the car’s tires and the road. [show all work, including the equation and substitution with units.] 13. Using the values for the forces you have calculated, explain whether or not the manufacturer’s claim for the car’s acceleration is possible.

So my dog just growled and I thought I should do a blog post on her since I cannot think of any ideas. I was just playing fetch with Pearl in my house, which has hard wood floor (the real kind). Pearl ran on the area carpet onto the hardwood, but when she tried to stop, she ended up skidding past the ball into the fireplace (its just a hole in the wall made of brick so she was unharmed). So here's the playbyplay: When Pearl was running on the carpet, she was able to get enough contraction to accelerate forward. Once Pearl hit the hardwood floor, she couldn't accelerate or decelerate as easy as when she was on the carpet without the friction on her paws. When she reached the ball, she attempted to stop abruptly, however, the with the low friction on the hardwood floor, she slid past the ball into the fireplace. While my dog is very smart, she is not smart enough to learn physics. But if she could, Pearl would probably not slide into the fireplace every time we play ball. At least I can get amusement from she sliding all over the place.

Okay, so today i was skateboarding, thinking about blog posts, but also thinking about all the forces and such that go into just doing a few tricks. Such as the kickflip, where the board spins on the lengthwise axis (for those of you not skateboarding people). It needs the physics of the ollie, which is downward force on the tail, force upwards because of the fulcrum of one of the axles, and forward momentum from pushing with the front foot, for an inertial fulcrum that rotates the board up into the air. From there, the rotation is caused by a downward force on the edge of the board, but, the force often isn't so much downward as it is across, similar to how the ollie levels the board not by pushing down, but across. That's the part that blew my mind, most of the forces and tricks using a skateboard are only possible because of the increase in friction from the grip tape, making the entire idea of skateboarding reliant on friction, not just with rolling down a hill and stopping, but every trick involved NEEDS friction to be done. Kinda just something cool i thought of.

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