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Showing results for tags 'force'.
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Name: Understanding the Tension Force Category: Dynamics Date Added: 16 February 2015 - 09:10 AM Submitter: Flipping Physics Short Description: None Provided Rope demonstrations to understand the Tension Force. Content Times: 0:11 Basic information about the Tension Force 0:43 Demonstrating the Tension Force 1:31 Showing the direction of the Tension Force 2:15 Adding another Tension Force to the Demonstration 2:50 A slack rope has zero Tension Force 3:10 Setting up the demonstrations Multilingual? View Video
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Name: A Common Misconception about Newton's Third Law Force Pairs (or Action-Reaction Pairs) Category: Dynamics Date Added: 09 February 2015 - 02:24 PM Submitter: Flipping Physics Short Description: None Provided Proof that the Force Normal and the Force of Gravity are not a Newton’s Third Law Force Pair. Content Times: 0:26 Drawing the Free Body Diagram 1:02 Not a Newton’s Third Law Force Pair 1:37 The Force Normal Force Pair 1:55 The Force of Gravity Force Pair Multilingual? View Video
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Name: Introduction to Newton’s Third Law of Motion Category: Dynamics Date Added: 19 January 2015 - 10:48 AM Submitter: Flipping Physics Short Description: None Provided Learn about Newton’s Third Law of Motion. Several examples of Newton’s Third Law Force Pairs are demonstrated and discussed. We even travel to Dandong, China. Content Times: 0:10 Newton’s Third Law 0:47 Ball and Head Force Pair 1:49 At the Ann Arbor Hands-On Museum 2:35 Why I don’t like the Action/Reaction definition 3:30 Hammer and Nail Force Pair 4:20 Mr.p and Wall Force Pair 4:36 Kevin Zhang and The Great Wall Force Pair 5:23 The Great Wall Location Shots 5:36 Filming the intro Multilingual? View Video
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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 Solving the problem 4:14 Another common mistake 5:07 Why is the acceleration positive? Multilingual? View Video
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Name: Summing the Forces is Vector Addition Category: Dynamics Date Added: 06 January 2015 - 01:59 PM Submitter: Flipping Physics Short Description: None Provided Summing the forces is nothing new, it is vector addition. This video compares summing the forces to graphical vector addition. This video builds off the previous video "View Video
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Name: A Three Force Example of Newton's 2nd Law with Components Category: Dynamics Date Added: 16 December 2014 - 02:17 PM Submitter: Flipping Physics Short Description: None Provided Finding the net force caused by three brothers fighting over a stuffed turtle. We break one vector in to components and find the components of the net force in order to solve for the net force. Content Times: 0:16 My 3 brothers 0:29 The problem 1:13 The givens 1:55 Drawing the Free Body Diagram 2:39 Breaking the Force of Chris in to its components 4:09 Redrawing the Free Body Diagram 4:54 Finding the components of the net force 5:47 Finding the net force 7:10 Finding the direction of the net force 8:02 Shouldn’t Turtle accelerate? 8:39 Directing my brothers Multilingual? View Video
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Name: Force vs. Time on a Dynamics Cart Category: Dynamics Date Added: 03 December 2014 - 10:59 AM Submitter: Flipping Physics Short Description: None Provided When the forces in a free body diagram don’t change students often think that Newton’s Second Law will yield the same results. This demonstration shows that is not true. This is a step-by-step analysis of tension force as a function of time for a dynamics cart in motion on a horizontal track. Content Times: 0:13 Reviewing known information 0:47 The three parts in this demonstration 1:22 Drawing the two free body diagrams 2:27 Understanding the free body diagrams 3:12 Identifying the String Direction 4:08 Finding the Tension Force during Part #1 6:06 Theoretical vs. Experimental Tension Force during Part #1 6:28 Finding the Tension Force during Part #2 7:52 Theoretical vs. Experimental Tension Force during Part #2 8:13 Finding the Maximum Acceleration during Part #3 9:37 Instantaneous vs. Average 10:21 All the graphs sequentially Multilingual? View Video
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Name: Introductory Newton's 2nd Law Example Problem and Demonstration Category: Dynamics Date Added: 25 November 2014 - 02:12 PM Submitter: Flipping Physics Short Description: None Provided This video could also be called "Finding the Force of Friction between a Dynamics Cart and Track†because we use Newton’s Second Law to analyze a demonstration and show how negligible the force of friction really is. Content Times: 0:16 Reading the problem 0:37 Demonstrating the problem 2:30 Translating the problem 3:47 Drawing the free body diagram 4:36 Summing the forces in the x direction 5:32 Solving for acceleration 7:04 Solving for the force applied 7:29 Is the force of friction negligible? Multilingual? View Video
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Name: The Reality of our First Free Body Diagram Category: Dynamics Date Added: 19 November 2014 - 02:55 PM Submitter: Flipping Physics Short Description: None Provided The free body diagram we first learn is not entirely accurate. All of the forces are not drawn from the center of mass of the object. Learn why we start this way and, when we get torque, what the free body diagrams will actually look like. Content Times: 0:12 Reviewing the first free body diagram 0:39 A more correct free body diagram 1:22 Comparing this approach to the projectile motion approach 1:52 When we get to torque 2:42 The green screen Multilingual? View Video
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Name: Introduction to Newton’s Second Law of Motion with Example Problem Category: Dynamics Date Added: 21 November 2014 - 02:38 PM Submitter: Flipping Physics Short Description: None Provided The application of Newton’s Second Law is when you really understand what the net force equals mass times acceleration where both force and acceleration are vectors really means. Therefore, we introduce Newton’s Second Law and then do an example problem. Content Times: 0:11 Defining Newton’s Second Law 1:00 The example problem 1:51 Drawing the Free Body Diagram 2:48 The Force of Gravity 3:42 The net force in the y-direction 5:28 The acceleration of the book in the y-direction 6:38 The net force in the x-direction 7:59 Solving for the dimensions of acceleration 8:54 Constant net force means constant acceleration Multilingual? View Video
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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
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Name: Introduction to the Force of Gravity and Gravitational Mass Category: Dynamics Date Added: 05 November 2014 - 09:47 AM Submitter: Flipping Physics Short Description: None Provided Defining the Force of Gravity or Weight and Gravitational Mass. We also determine the dimensions for force in both Metric and English units. Content Times: 0:11 Defining the Force of Gravity or Weight 1:09 Defining Gravitational Mass 2:12 The direction of the Force of Gravity 2:47 Determining the dimensions for force 4:09 The English unit for force 4:54 Slug vs. Blob Multilingual? View Video
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Name: Introduction to Force Category: Dynamics Date Added: 2016-10-27 Submitter: Flipping Physics Defining Force. Including its dimensions, demonstrations of force and mass affecting acceleration, showing that a force is an interaction between two objects and contact vs. field forces. Content Times: 0:11 Defining force 0:56 Demonstrating how force and mass affect acceleration 2:15 Demonstrating why a force doesn’t necessarily cause acceleration 4:09 Force is a vector 4:23 A force is an interaction between to objects 4:56 Contact vs field forces 5:38 The force of gravity is a field force 6:19 Face and snow force interaction Want Lecture Notes? Multilingual? Please help translate Flipping Physics videos! Next Video: Introduction to the Force of Gravity and Gravitational Mass Previous Video: Introduction to Inertia and Inertial Mass 1¢/minute Introduction to Force
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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
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Name: How to Wear a Helmet a PSA from Flipping Physics Category: Momentum and Collisions Date Added: 18 September 2014 - 03:36 PM Submitter: Flipping Physics Short Description: None Provided Wearing a helmet is all about impulse, change in momentum and the force of impact. This video illustrates why you should secure your helmet to your head. Thank you very much to Colton and Jean Johnson who said yes when I asked them if I could film myself riding my bike off their dock. Colton also said, “In my 75 years of living, that has got to be the strangest request I have ever received.†Thank you also to Chris Palmer and Larry Braak for being my on-site camera operators. Content Times: 0:19 Are you wearing your helmet? 0:53 Riding my bike off the dock into the lake. 2:15 The helmet falls off 2:40 Newton’s 2nd Law 4:08 Impulse approximation 5:01 Which variables are NOT dependent on helmet status 6:23 Impulse 7:01 What variables does wearing a helmet change 7:57 This one time I was riding my bike … 8:50 A contrasting story Want Lecture Notes? Multilingual? Please help translate Flipping Physics videos! More Flipping Physics Videos: The Classic Bullet Projectile Motion Experiment & Dropping Dictionaries Doesn’t Defy Gravity, Duh! 1¢/minute View Video
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Name: A Brief Look at the Force of Drag using Numerical Modeling (or The Euler Method) Category: Dynamics Date Added: 22 May 2014 - 05:01 PM Submitter: Flipping Physics Short Description: None Provided This is how you include air resistance in projectile motion. It requires the Drag Force and Numerical Modeling (or the Euler Method). It is also very helpful to use a spreadsheet to do the calculations. I prove a statement from a previous projectile motion problem video, "Air resistance decreases the x displacement of the ball by less than 1 cm." Content Times: 0:22 The statement this video proves 1:01 The basic concept of air resistance 1:54 The Free Body Diagram 2:20 The Drag Force Equation 3:13 Information about the Lacrosse Ball 4:03 The Drag Coefficient 4:55 The Density of Air 5:18 How the Drag Force affects the motion 5:58 The basic idea of Numerical Modeling (or the Euler Method) 6:50 Solving for the acceleration in the x direction 8:53 Solving for the final velocity in the x direction 9:54 Solving for the final position in the x direction 11:41 Entering the Lacrosse Ball information into Excel 13:34 Solving for the Drag Force in x direction in Excel 14:29 Solving for the acceleration in the x direction in Excel 14:58 Solving for the final velocity and final position in the x direction in Excel 15:46 Solving for the acceleration in the y direction 17:21 Solving for all the variables in the y direction in Excel 19:13 Click and Drag Copy. Harnessing the Power of Excel! 19:43 Understanding the numbers in Excel 20:35 Solving for the decrease in the x displacement caused by the Drag Force View Video
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Torque: It makes things rotate
pavelow posted a blog entry in Blog Having Nothing to do with Physics
Torque is the tendency of force to rotate something around an axis. Torque helps you turn a doorknob, it makes a car's tires spin, it basically helps a force act in a circle. Applications of torque equations can help solve real world problems. Locations for supports for bridges can be determined by examining the effects of the torque vehicles would cause on a bridge. An engineer looking to efficiently maximize the potential for producing torque in an engine would choose electrical or diesel power over gasoline power to use the fuel effectively. People who would like to easily compare weights without a scale can easily use torque properties to their advantage, specifically with a balance. Putting a weight at each end of a beam and sliding it over a fulcrum until it balances can help determine relative weights of objects by comparing the lengths of sides of the balance. For example, Person A and Person B are on opposite ends of a log, and the log is balanced. The leg extending to Person A is twice as long as the one extending to Person B. because torque is the length of the arm multiplied by the weight of the object, it can be determined that, because the torques balance, Person B has twice the weight of Person A. -
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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