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.
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.
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.
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.
In this experiment, middle school and high school students use their PocketLabs learn about angular velocity -- the rate of change of angular position of a rotating body.
A theremin , named after its Russian inventor in the early 1900's, is an electronic musical instrument that is controlled without any contact by the musician. Volume is controlled by moving one hand near one antenna, while pitch is controlled by moving the other hand near a second antenna. The sound is generated by a pair of high-frequency oscillators.
What is hysteresis?
Hysteresis can be defined as a lag time in the response of a system to forces placed on the system. A common way used in physics classes to observe hysteresis is by loading and then unloading weights from a suspended rubber band, while observing the extension of the rubber band. Students find that the rubber band does not Obey Hooke's law. They also observe that the amount of stretch of the rubber band is different when unloading than when loading.
This 3D printed model demonstrates the physics of a simple pendulum that consists of a mass, m, hanging from an arm of length, L, and fixed at a pivot point, P. You can move the mass along the length of the arm to change the center of mass of the pendulum. If you displace the pendulum from equilibrium to an initial angle, θ, and release, the motion will be regular and repeat. This is an example of periodic motion also called simple harmonic motion.