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Energy and Momentum

Newton’s Third Law

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Submitted by DaveBakker on Tue, 04/23/2019 - 18:14

Engineering Crash Cushions to Learn Newton's Third Law

Newton's third law states that for every action, there is an equal and opposite reaction. By crashing a physics cart into a wall, various crash cushions can be used to reduce the forces experience by the cart.

The "Speeder Upper" - Translational and Rotational Motion Study

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Submitted by Rich on Wed, 04/17/2019 - 19:08

What's a "Speeder Upper"?

As shown in Figure 1, a "Speeder Upper" is a pair of disks that are connected by a short rod of much smaller radius.  The NSTA science ruler gives you a feel for the dimensions of the Speeder Upper.  The disks are 0.5" thick and 2.5" in diameter and are connected by a short 5/16" diameter wood dowel rod.  The 3D printer stl file for the disks is provided with this lesson in the event that you want to make a Speeder Upper for use in your physics classroom.

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Ideal Gas Law Verified in a Steel Balls Lab

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Submitted by Rich on Tue, 03/05/2019 - 22:18

Introduction to the Ideal Gas Law

The ideal gas law is commonly seen in the form PV = nRT, where P is the pressure, V is the volume, T is the absolute temperature, n is the amount of the gas in moles, and R is the ideal gas constant.  It is a composite form of Boyle's, Charles's, Avogadro's, and Gay Lussac's laws.  This law helps to explain how many things work, including bicycle pumps, hot air balloons, pressure cookers, and steam engines, just to mention a few.

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Hysteresis with Rubber Bands

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Submitted by Rich on Wed, 02/06/2019 - 17:49

Introduction to Hysteresis

Hysteresis can be defined as a lag time in the response of a system to forces placed on the system.  The response of the system depends not only on the present magnitude of the force but also on the previous history of the system.  From the point of view of mathematics, the response to the force is a double-valued function.  This means that one value applies when the force is increasing, while another value applies when the force is decreasing.  A graphical plot of force and re

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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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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.    

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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