Do you really know how to walk or run? PocketLab's tactile pressure sensor provides for an opportunity for your students to investigate foot pressure during these activities. Improper form can ultimately lead to unwanted visits to a podiatrist. Whenever you take a step, your body places pressure on muscles, joints and tendons in your legs, knees, ankles, feet and toes. Controlling heel pressure is a key factor to prevent injuries in this regard.
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.
Lissajous patterns have fascinated physics students for decades. They are commonly observed on oscilloscopes by applying simple harmonic functions with different frequencies to the vertical and horizontal inputs. Three examples are shown in Figure 1. From left to right, the frequency ratios are 1:2, 2:3, and 3:4. These Lissajous patterns were created by use of the parametric equation section of The Grapher software written by the author of this lesson. You are welcome to use this softwa
These coils come in pairs with the same number of turns of wire on each of the two coils. In "true Helmholtz" configuration: (1) the coils are wired in series with identical currents in the same direction in each coil, and (2) the coils are placed a distance apart that is equal to the radius of each coil. When in this configuration, they produce a very uniform magnetic field that is directed along their common central axis.
A Physics Challenge
In this lesson, AP and college students are challenged to derive equations for the periods of two fundamental modes of oscillation of a pair of coupled physics carts. Derivation will involve Hooke's law, Newton's Second Law of Motion, and principles of simple harmonic motion. Theory is then compared to experimental results obtained from PocketLab Voyager rangefinder data using Phyphox software.
In this lesson students will find that a current-carrying loop can be regarded as a dipole, as it generates a magnetic field for points on its axis. Students use PocketLab Voyager and Phyphox software to compare experiment and theory for the magnetic field on the axis of a current loop. A similar experiment not making use of Phyphox can be found by clicking this link. An experiment making use of a magnet, instead of a
Isaac Newton is well-known for the apple that hit his head and the discovery of gravity. His three Laws of Motion, however, are among the most famous laws of physics. In this lesson, we are especially interested in Newton’s Third Law of Motion—all forces between two objects are equal in magnitude and opposite in direction. We will be studying collisions between two identical carts that are bouncing back-and-forth, much like a Newton’s cradle with just two steel balls. Repelling magnets attached to the front bumpers of each of the carts al
Magnets, from the traditional alnico bar magnets to the modern neodymium magnets, have been of interest to most everyone for decades. The attraction or repulsion of two such magnets when brought close together is particularly interesting. This can be expressed by making quantitative measurements relating magnetic field strength to distance from the magnet.