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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/theeulermethod.html"]A Brief Look at the Force of Drag using Numerical Modeling (or The Euler Method)[/url] Thank you Rhonda Petty of [url="http://www.ewashtenaw.org/government/departments/parks_recreation/rollinghills/rolling%20hills.html"]Rolling Hills Water Park[/url] Thank you Aaron Fown of [url="http://www.firstuav.co"]FirstUAV[/url] for the aerial footage [url="http://www.flippingphysics.com/give.html"]1Â¢/minute[/url]

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

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, â€œIn my 75 years of living, that has got to be the strangest request I have ever received.â€ Thank you also to Chris Palmer and Larry Braak for being my onsite 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 Newtonâ€™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 â€¦ 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 Doesnâ€™t Defy Gravity, Duh! 1Â¢/minute View Video

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, â€œIn my 75 years of living, that has got to be the strangest request I have ever received.â€ Thank you also to Chris Palmer and Larry Braak for being my onsite 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 Newtonâ€™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 â€¦ 8:50 A contrasting story Want [url="http://www.flippingphysics.com/helmet.html"]Lecture Notes[/url]? Multilingual? Please help [url="http://www.flippingphysics.com/translate.html"]translate Flipping Physics videos[/url]! More Flipping Physics Videos: [url="http://www.flippingphysics.com/bullet.html"]The Classic Bullet Projectile Motion Experiment[/url] & [url="http://www.flippingphysics.com/droppingdictionaries.html"]Dropping Dictionaries Doesnâ€™t Defy Gravity, Duh![/url] [url="http://www.flippingphysics.com/give.html"]1Â¢/minute[/url]

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 [url="http://www.flippingphysics.com/theeulermethod.html"]Want lecture notes & the Excel File?[/url] (also contain's photo credits and links to website's shown in video) The original problem videos for this are: [url="http://www.flippingphysics.com/projectilemotionproblempart1of2.html"](part 1 of 2) An Introductory Projectile Motion Problem with an Initial Horizontal Velocity[/url] [url="http://www.flippingphysics.com/projectilemotionproblempart2of2.html"](part 2 of 2) An Introductory Projectile Motion Problem with an Initial Horizontal Velocity[/url] [url="http://www.flippingphysics.com/howmany.html"]How Many Attempts did it Really Take?[/url]  with live music from Amos Lee [url="http://www.flippingphysics.com/give.html"]1¢/minute[/url]
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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

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.

 force
 centripetal

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