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  1. Name: Understanding the Force of Friction Equation Category: Dynamics Date Added: 2015-08-18 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
  2. 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
  3. Name: Introduction to the Coefficient of Friction Category: Dynamics Date Added: 2015-08-09 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
  4. Name: Introduction to Static and Kinetic Friction by Bobby Category: Dynamics Date Added: 2015-08-07 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 Fricti
  5. Review of the topics of Work, Energy, Power and Hooke’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 Hooke’s Law Multilingual? [url="http://www.flippingphysics.com/translate.html"]Please help translate Flipping Physics videos[/url]! Want [url="http://www.flippingphysics.com/ap1-work-review.html"]Lecture Notes[/url
  6. 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 Newton’s First Law of Motion 2:20 Newton’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 Newton’s Third Law of Motion 8:20 Inclines 9:41 Translational Equilibrium Multilingual? [url="http://www.flippingphysics.com/translate.html"]Please help translate Flipping Physics videos![/url] Want [url="http://www.flippingphysics.com/ap1-dynamics-review.html"]Lecture No
  7. 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 Hooke’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 Hooke’s Law Multilingual? View Video
  8. 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 Newton’s First Law of Motion 2:20 Newton’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 Newton’s Third Law of Motion 8:20 Inclines 9:41 Translational Equilibrium Multilingual? View Video
  9. In order to use Newton’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? [url="http://www.flippingphysics.com/translate.html"]Please help translate Flipping
  10. 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 Newton’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 S
  11. 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 frict
  12. 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 Forc
  13. 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? [url="http://www.flippingphysics.com/translate.html"]Please help translate Flipping Physics videos![/url] Another Drag Force Video: [url="http://www.flippingphysics.com/th
  14. 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
  15. 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 fo
  16. 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 Anti-lock 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 tru
  17. 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?
  18. 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 1,250-kilogram (12,300-newton) 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
  19. 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 play-by-play: 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
  20. 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
  21. Drifting had a lot to do with physics. I'm just gonna start right in with friction. Friction is one of the essentials when it comes to the physics of drifting. The amount of friction between the tires of a car and the surface depends on a lot of key factors. One factor is the surface and the condition of the surface. The amount of friction between the tires of the car and the surface can change because different surfaces have different patterns and different amounts of resistivity to sliding. On the reference table there is a difference in the coefficient of friction between asphalt and concre
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