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The study of martial arts is the study of physics as it relates to the human body. The various types of martial art evolved as different approaches to the same problem - what is the most effective way of using the body to defend and attack? We shouldn't be surprised to find that the most effective methods of blocking and striking, perfected over hundreds of years, use the laws of physics to maximum effect
This new software uploads the current positions of satellites and display them around a 3D image of the earth. The image can be tilted and rotated. Individual orbits can be shown by selecting a dot. Enter the name of a satellite and ts orbital data is displayed. It is not as powerful as the old J-Track from NASA which is not available anymore, but it is still impressive and shows the ring of geostationary satellites.
A Walter Fendt applet. You can vary, the initial height, speed and angle, as well as the mass of the object and the gravitational attraction. Air resistance is ignored. The path of the projectile is progressively drawn on a set of x-y axes. As the object moves along its path you can show, either both velocity components, the acceleration vector or the force vector. There is also the choice of displaying the amount of KE, GPE and Total Energy, as the object moves through its flight. For fast moving objects there is also a slow motion option.
This shows a five ball cradle in which you can vary the number of balls pulled aside from 1 to 4, and then release.
Walter Fendt's applet shows a one dimensional collision between rail cars. The elastic collision uses spring bumpers, the inelastic collision is a sticky collision, with both rail cars locking on impact. You are able to vary the mass and the velocity including negative values. As the cars collide a dot representing the centre of mass of the system moves along underneath them. You also have the option of either showing the velocities, momenta as they collide or energies before and after. This can be very instructive.
This applet by Walter Fendt shows a spinning carousel with masses hanging from the edge. They are at an angle as the carousel rotates. You have four choices for the display i) the carousel itself, ii) the carousel with weight, tension and net forces shown on the each of the masses, iii) a force diagram for the mass, and iv) calculated values for frequency, angular velocity, radius, velocity, angle, weight, centripetal force and tension. The aspects you can vary are: the period, the distance out of the suspension points for the masses, the length of the string supporting the masses and the masses themselves
This applet by Walter Fendt displays the elliptical nature of planetary orbits. The display features the sun and the planet. You can choose to show any of all of the following the orbital path, the axes, and the lines to the foci. You can move the planet to other points in the orbit with your cursor. You are able to choose any of the planets or Halley's comet. The display also includes the semi-major and semi-minor axes and the eccentricity. The distance from the sun, max, min and for where the planet is are displayed in A.U.'s. You can also design your own orbit by entering values for the semi-major axis and the eccentricity.
The display features a mass oscillating up and down on the end of a spring. Beside the spring is a graph against time of one of the following parameters: elongation (which shows variation from mean position), velocity, acceleration, net force (called force) and Total PE and KE. A dot moves along the graph in time with the spring, and the vector quantities are represented by an arrow on the mass. You can vary the force constant, amplitude and mass.
The display features a planet going around the sun. You can add two sectors of equal area with the time in each recorded each time the planet passes through each. The location of the areas in the orbit and their size can be adjusted. Similarly you can select the show the velocity vector on the planet as it revolves. You can select any of the planets or Halley's comet or design your own orbit. The display also gives the planet's distance from the sun and the current velocity, as well as max and min values. There is a slow motion option which is useful showing the velocity vector of Halley's comet.