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Name: Introductory Uniformly Accelerated Motion Problem  A Braking Bicycle Category: Kinematics Date Added: 21 May 2014  03:43 PM Submitter: Flipping Physics Short Description: None Provided This video continues what we learned about UAM in our previous lesson. We work through a introductory problem involving a bicycle on which we have applied the brakes. Content Times: 0:28 Reading the problem 0:48 Seeing the problem 1:15 Translating the problem to physics 2:35 Why is it final speed and not velocity? 3:48 Solving for the acceleration 6:03 Converting initial velocity to meters per second 7:32 Solving for distance traveled. 8:05 A common mistake 10:02 Two more ways to solve for the distance traveled. 10:45 Why didn't the speedometer show the correct final speed? View Video

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Name: Walking Position, Velocity and Acceleration as a Function of Time Graphs Category: Kinematics Date Added: 21 May 2014  08:56 AM Submitter: Flipping Physics Short Description: None Provided This lesson builds on what we learned about position as a function of time graphs. We start with velocity as a function of time graphs, determine what the motion would look like and then draw position and acceleration as a function of time graphs. We use the concepts of slope and tangent line to help us build the graphs. Content Times: 0:35 What is the slope of a velocity vs. time graph? 2:30 Walking the 1st velocity vs. time example 4:17 Explaining what a constant slope is 7:11 Drawing position vs. time for the 1st example 9:08 The Magic Tangent Line Finder! (defining tangent line) 11:18 A look forward to Calculus 12:51 Drawing acceleration vs. time for the 1st example 14:35 Walking the 2nd velocity vs. time example 15:47 Drawing position vs. time for the 2nd example 17:19 Drawing acceleration vs. time for the 2nd example 18:17 Walking the 3rd velocity vs. time example 20:41 Drawing position and acceleration vs. time for the 3rd example 22:55 Ideal vs. real data View Video

Name: Finding Average Speed for Pole Position: Example Problem  Not as easy as you may think Category: Kinematics Date Added: 21 May 2014  08:50 AM Submitter: Flipping Physics Short Description: None Provided This video is an example problem that walks through finding the average speed for the last 2 laps of the 4 lap qualifier for the Indianapolis 500 assuming an average speed for the first 2 laps. It is actually more difficult than it initially appears. Content Times: 0:36 Reading the Problem 1:06 Translating to Physics 3:25 A Visual representation of our Known Values 4:07 Beginning to Solve the Problem 5:27 Finding the Time for Part 1 7:15 Finding the Total Time 9:00 Finding the Time for Part 2 10:15 Finding the Average Speed for Part 2 10:45 A Common Mistake 12:07 The Answer 13:15 A Question about Significant Digits View Video

Name: Velocity and Speed are Different: Example Problem Category: Kinematics Date Added: 21 May 2014  08:47 AM Submitter: Flipping Physics Short Description: None Provided This example problem works shows that Velocity and Speed are different. It also illustrates that Speed is Not Velocity without direction. Content Times: 0:16 Reading the Problem 1:10 Translating the problem to physics 1:53 Part (a) Average Speed 2:57 Part ( Average Velocity 4:34 Speed is Not Velocity without direction Want Lecture Notes? Next Video: Understanding and Walking Position as a function of Time Graphs Previous Video: Average Velocity Example Problem with Three Velocities View Video

Name: Average Velocity Example Problem with Three Velocities Category: Kinematics Date Added: 21 May 2014  08:45 AM Submitter: Flipping Physics Short Description: None Provided This example problem works through finding the average velocity when we have multiple parts to the givens. It involves splitting the given information into separate parts, finding the total displacement, the total time and then the total average velocity. Content Times: 0:23 Reading the Problem 0:56 Translating the problem to physics 1:47 Splitting the givens into three parts 3:58 A plea to slow down when solving problems 5:13 Putting the givens in to a table 5:53 Beginning to solve the problem 6:59 Solving for the individual displacements 8:39 Finding the total displacement 9:33 Finding the total average velocity 10:58 A incorrect way to solve for average velocity 12:20 Outtakes View Video

Name: Introduction to Velocity and Speed and the differences between the two. Category: Kinematics Date Added: 21 May 2014  08:44 AM Submitter: Flipping Physics Short Description: None Provided This video introduces the definition of Velocity. It also walks through a simple, introductory average velocity example problem. At the end it defines speed and discusses the difference between speed and velocity. Content Times: (click to skip to that time) 0:18 Velocity Definition 2:12 Velocity has both Magnitude and Direction 3:06 Example Problem 8:41 Speed Definition 9:15 Differences between Speed and Velocity 11:00 Outtakes View Video

On March 1, 2014, user Ben Shelton discussed how physics is used in the James Bond movie Skyfall. Since I have seen this movie and other action movies like it, I found it interesting how heroes such as James Bond defy the laws of physics. Ben Shelton broke down the first scene of Skyfall using the equation vf2 = vi2 + 2ad to prove the inaccuracy of a character's fall. It makes me wonder how physics could be used to analyze other action movies. Here is the link to the original post (warning: it contains spoilers):

Escape Velocity and its Applications
pavelow posted a blog entry in Blog Having Nothing to do with Physics
The calculation for escape velocity is a pretty simple conservation of energy problem. K at infinity =.5mv2 = 0 because v at infinity = 0 U at infinity = GMm/r = 0 at infinity because r = infinity K=0 U=0 K=U .5mv2 = GMm/r From there it's simple algebra, and escape velocity is ve = sqrt(2GM/r) This equation's applications are seen in the exploration of space. Spacecraft need to reach escape velocity in order to not eventually crash back into the earth's surface. Some satellites are orbiting earth at just above escape velocity, meaning that they are actually spiraling away from the planet. On the other hand, some satellites are orbiting just below escape velocity, meaning that they will eventually fall into the atmosphere and burn up. However, some of these satellites have onboard rockets which can change their trajectory, allowing for more stable orbits and longer lifetimes. The Voyager 1 spacecraft used its escape velocity to leave the solar system and explore what lies beyond. NASA's Curiosity mission required the spacecraft to reach near escape velocity (although I'm sure the actual spacecraft reached a higher speed) to make it to Mars. As humans explore more of the space that surrounds the planet, escape velocity and its applications will become even more important. 
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A lab in which students oscillate an extended spring to create standing waves. By measuring the period or frequency of the standing waves, as well as the wavelength, students calculate the speed of the wave using the wave equation. Ultimate goal of this lab is to have students understand that the type of wave and the medium determine the speed of the wave. The wave equation, holds true and describes a relationship, but the speed of the wave is not determined by adjusting the wavelength or frequency. Materials: Long springs stopwatches meter sticksFree 

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