<![CDATA[PocketLab Community: Blog Posts]]>
http://support.thepocketlab.com
<![CDATA[Investigating the "Spinning Coin" (Euler Disk) Problem]]>
http://support.thepocketlab.com/blog/investigating-the-spinning-coin-euler-disk-problem
Most everyone has spun a coin on its edge on a table top, and many find the result quite fascinating. The coin gradually begins to fall on its side while spinning, makes a whirring sound with increasing frequency the longer it spins, and then abruptly stops. The Swiss physicist, Leonhard Euler, studied this back in the 1700's. An educational toy, referred to as Euler's disk can now be purchased on-line and in hobby shops specializing in science. Such disks have been carefully engineered to...
]]>Thu, 27 Oct 2016 14:10:04 -0700http://support.thepocketlab.com/blog/investigating-the-spinning-coin-euler-disk-problem<![CDATA[A Velocity Lab Experiment on Rolling Resistance]]>
http://support.thepocketlab.com/blog/a-velocity-lab-experiment-on-rolling-resistance
Rolling resistance is a force that opposes the motion when an object rolls along a surface. In this experiment a coasting cylinder on a carpet gradually slows down and stops due to rolling resistance. The primary factor affecting rolling resistance here is deformation of the carpet as the cylinder rolls. Not all of the energy needed to deform the carpet is recovered when the pressure from the cylinder is removed. In other words, the effect is non-elastic. The purpose of this experiment is...
]]>Mon, 17 Oct 2016 11:22:55 -0700http://support.thepocketlab.com/blog/a-velocity-lab-experiment-on-rolling-resistance<![CDATA[The Physics of a Falling and Unrolling TP Roll]]>
http://support.thepocketlab.com/blog/the-physics-of-a-falling-and-unrolling-tp-roll
Yes, that's right--the physics of a falling and unrolling toilet paper roll. This experiment will give students practice in rotational motion of an object and translational motion of its center-of-mass. It will also involve both the kinematics and dynamics of the motion. While it can be done by use of the VelocityLab app, interpretation of the angular velocity data from the PocketLab app is much easier. The figure below shows the apparatus setup for this lab experiment. A ring stand is on a...
]]>Mon, 26 Sep 2016 14:21:05 -0700http://support.thepocketlab.com/blog/the-physics-of-a-falling-and-unrolling-tp-roll<![CDATA[Rotational Dynamics of a Falling Meter Stick]]>
http://support.thepocketlab.com/blog/rotational-dynamics-of-a-falling-meter-stick
There is a well-known problem in rotational dynamics that involves a meter stick. The meter stick is held in a vertical position with one end on the floor. It is then released so that it falls to the floor. The end initially on the floor is not allowed to slip during the fall. Students are asked to derive an equation that predicts the angular velocity of the meter stick just before it hits the floor. The derivation involves many physics concepts including gravitational potential energy,...
]]>Thu, 22 Sep 2016 19:12:24 -0700http://support.thepocketlab.com/blog/rotational-dynamics-of-a-falling-meter-stick<![CDATA[A PocketLab Experimental Analysis of a Yo-yo]]>
http://support.thepocketlab.com/blog/a-pocketlab-experimental-analysis-of-a-yo-yo
The yo-yo, a toy with an axle connected to two disks and string wound on the axle, has been of fascination to many for centuries. It also offers a perfect opportunity to study angular velocity when a PocketLab has been attached to it. A graph of angular velocity vs. time of a yo-yo will require students to think carefully about the detailed behavior related to its motion. The author worked with a purchased $3 yo-yo, but found the results to be much clearer when attaching a PocketLab to a...
]]>Sun, 04 Sep 2016 08:40:59 -0700http://support.thepocketlab.com/blog/a-pocketlab-experimental-analysis-of-a-yo-yo<![CDATA[An Experiment in Rotational Dynamics that Emphasizes the NGSS Science and Engineering Practices]]>
http://support.thepocketlab.com/blog/an-experiment-in-rotational-dynamics-that-emphasizes-the-ngss-science-and-engineering-practices
Here is a PocketLab based project that will get your physical science and physics students involved in many of the Next Generation Science Standards, particularly in the NGSS science and engineering practices. Two wheels and a wood axle from the PocketLab Maker Kit are placed on a narrow inclined plane so that the red wheels overhang the sides of the inclined plane and the entire system rolls down on the wood axle without any slipping. When the wheels and axle get near the bottom of the...
]]>Tue, 30 Aug 2016 11:14:03 -0700http://support.thepocketlab.com/blog/an-experiment-in-rotational-dynamics-that-emphasizes-the-ngss-science-and-engineering-practices<![CDATA[Using VelocityLab in an AP/College Physics Experiment Involving Rotational Dynamics]]>
http://support.thepocketlab.com/blog/using-velocitylab-in-an-ap-college-physics-experiment-involving-rotational-dynamics
This experiment is designed for AP Physics and college physics students. It considers a solid cylinder of mass M and radius R that is rolling down an incline with a height h without slipping. Using energy and dynamics concepts, students first derive equations for (1) the speed of the center of mass of the cylinder upon reaching the bottom of the incline, and (2) the acceleration of the center of mass of the cylinder as it rolls down the incline. The free-body diagram at the center shows all...
]]>Wed, 24 Aug 2016 12:59:59 -0700http://support.thepocketlab.com/blog/using-velocitylab-in-an-ap-college-physics-experiment-involving-rotational-dynamics<![CDATA[Determining the Radius of Curvature of a Gradual Street Turn]]>
http://support.thepocketlab.com/blog/determining-the-radius-of-curvature-of-a-gradual-street-turn
This lesson is a physics application of PocketLab that allows students to determine the radius of curvature of a gradual turn on a street. A PocketLab mounted on the dashboard of a car records both the angular velocity and the centripetal acceleration of the car as it moves at a nearly constant speed around the curve. All of the required data for an example problem are contained in files attached to this lesson. Alternately, students can collect their own data. If the latter approach is...
]]>Fri, 12 Aug 2016 11:59:05 -0700http://support.thepocketlab.com/blog/determining-the-radius-of-curvature-of-a-gradual-street-turn<![CDATA[PocketLab Experiment on Centripetal Acceleration with a 3-speed Ceiling Fan]]>
http://support.thepocketlab.com/blog/pocketlab-experiment-on-centripetal-acceleration-with-a-3-speed-ceiling-fan
There are two approaches that the teacher can take to doing this experiment on centripetal acceleration with a three-speed ceiling fan and PocketLab. The first choice is for those with an available three-speed ceiling fan. In this case students can collect all data by actually performing the experiment themselves. The PocketLab should be mounted to one of the ceiling fan blades with a very strong double stick mounting tape. For safety, however, students should still wear goggles. The author...
]]>Mon, 01 Aug 2016 00:00:00 -0700http://support.thepocketlab.com/blog/pocketlab-experiment-on-centripetal-acceleration-with-a-3-speed-ceiling-fan<![CDATA[Using a 33-45-78 Turntable to Show that Centripetal Acceleration is Proportional to the Square of the Velocity and Inversely Proportional to Radius]]>
http://support.thepocketlab.com/blog/using-a-33-45-78-turntable-to-show-that-centripetal-acceleration-is-proportional-to-the-square-of-the-velocity-and-inversely-proportional-to-radius
PocketLab in conjunction with a 33-45-78 RPM turntable is an ideal setup for studying centripetal acceleration. There are two videos that can be found in the Videos page of this web site. They show that (1) keeping radius constant implies that centripetal acceleration is proportional to the square of the velocity, (2) keeping velocity constant while varying the radius implies that centripetal acceleration is inversely proportional to the radius. The PocketLab is placed in its silicone...
]]>Wed, 06 Jul 2016 00:00:00 -0700http://support.thepocketlab.com/blog/using-a-33-45-78-turntable-to-show-that-centripetal-acceleration-is-proportional-to-the-square-of-the-velocity-and-inversely-proportional-to-radius<![CDATA[Gyroscope: Intro to Angular Velocity]]>
http://support.thepocketlab.com/blog/gyroscope-intro-to-angular-velocity
]]>Tue, 01 Mar 2016 00:00:00 -0800http://support.thepocketlab.com/blog/gyroscope-intro-to-angular-velocity<![CDATA[Gyroscope - Soup Can Race]]>
http://support.thepocketlab.com/blog/experiment-10-gyroscope-soup-can-race
]]>Tue, 09 Feb 2016 22:00:57 -0800http://support.thepocketlab.com/blog/experiment-10-gyroscope-soup-can-race<![CDATA[Gyroscope - Angular Rotation Game]]>
http://support.thepocketlab.com/blog/experiment-18-gyroscope-angular-rotation-game
]]>Tue, 09 Feb 2016 21:13:09 -0800http://support.thepocketlab.com/blog/experiment-18-gyroscope-angular-rotation-game<![CDATA[Gyroscope - Understanding Centripetal Force]]>
http://support.thepocketlab.com/blog/experiment-19-gyroscope-understanding-centripetal-force
]]>Tue, 09 Feb 2016 21:11:18 -0800http://support.thepocketlab.com/blog/experiment-19-gyroscope-understanding-centripetal-force<![CDATA[Gyroscope - Arms of a Spinning Figure Skater]]>
http://support.thepocketlab.com/blog/experiment-20-gyroscope-arms-of-a-spinning-figure-skater
]]>Tue, 09 Feb 2016 21:05:03 -0800http://support.thepocketlab.com/blog/experiment-20-gyroscope-arms-of-a-spinning-figure-skater