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Rotational Motion: Moment of Inertia

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Submitted by Rich on Thu, 01/24/2019 - 20:05

Rotational Motion and Moment of Inertia Lab Setup

Figure 1 shows a ramp and three distinctly different objects that you will release from rest at the top.  Each object will roll downward to the end of the ramp without slipping, resulting in rotational motion.  The roll of Gorilla tape has a shape known as an annular cylinder.  The can of jellied cranberry sauce is a solid cylinder.  The cardboard tube, in contrast to the can, is hollow.  All three of these objects will rotate about their central cylinder axis while rolling down the ramp.  Each of these three objects has a

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Physics from a Croquet Mallet and Ball

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Submitted by Rich on Sat, 01/19/2019 - 20:23

Introduction

Various forms of the sport now known as croquet have been around for centuries.  Plastic or wooden balls are struck with a mallet through hoops, called wickets in the United States.  The components of a typical croquet set are shown in Figure 1.  Very popular in the UK, there is even a World Croquet Federation for those who take the sport seriously.  In the United States, it is common to set up croquet as a garden game at graduation and birthday parties.  But who would have thought that a croquet ball and mallet equipped with PocketLab Voyager and the PocketL

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PocketLab Voyager: Newton's Law of Cooling

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Submitted by Rich on Thu, 01/03/2019 - 03:02

Newton's Law of Cooling

In this experiment students will use PocketLab Voyager to collect data related to the cooling of a container of hot water as time goes on.  Sir Isaac Newton modeled this process under the assumption that the rate at which heat moves from one object to another is proportional to the difference in temperature between the two objects, i.e., the cooling rate = -k*TempDiff.  In the case of this experiment, the two objects are water and air.

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Fluid Pressure in a Fluid at Rest

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Submitted by Rich on Fri, 12/21/2018 - 01:22

Introduction

In a PockeLab lesson entitled "Hydrostatic Pressure Lab", posted by kwarnke in October 2017, students investigate the relationship between the height of a column of water and hydrostatic pressure.  The lab results worked very well in this regard, but the apparatus uses a 5-gallon jug with modifications, a bicycle pump, and 5 meters of vinyl tubing.  We should be able to come up with a much simpler and less expensive fluid pressure apparatus to achieve the same result, as the

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Rolling Resistance Lab: CloudLab/Mini HotRod

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Submitted by Rich on Tue, 12/11/2018 - 16:25

Rolling Resistance Introduction

Rolling resistance is a force that opposes the motion when an object rolls along a surface.  There are many examples of objects experiencing rolling resistance:  car or bicycle tires on pavement, skateboard wheels on a half pipe ramp, steel wheels on a railroad track, ball bearings in a pulley, bowling balls on a bowling lane, and carts rolling on a dynamics track, just to mention a few.  Many factors can affect the magnitude of the forces associated with rolling resistance.

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Crash Cushioning Lab - NGSS Based

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Submitted by Rich on Thu, 12/06/2018 - 16:09

Introduction to Crash Cushioning

In addition to automobile features that promote road safety, there has been and continues to be a great deal of work on highway features that save lives.  An earlier lab entitled Crash Cushion Investigation, submitted by PocketLab, makes use of the PocketLab HotRod to investigate crash cushioning similar to that shown in Figure 1.    

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Terminal Velocity vs Area of a Falling Object

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Submitted by Rich on Tue, 12/04/2018 - 00:22

Terminal Velocity Introduction

The effect of mass on the terminal velocity of an object falling in air is commonly done using basket coffee filters.  But how could we study the effect of area on the terminal velocity of a falling object?  One way to do this is to use PocketLab Voyager and its range finder along with a single piece of cardstock as the object to be dropped.

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Energy Conservation with a Mini HotRod

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Submitted by Rich on Thu, 11/29/2018 - 22:16

Introduction

What can you do with a PocketLab Mini HotRod, Voyager, five pieces of HotWheels track, and a half-dozen wood blocks about the size of Jenga blocks?  How about an experiment in energy conservation!  Add CloudLab and you have an environment for your students/lab groups to perform, analyze, document and save their PocketLab lab reports.

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