Topics Vectors Vector Components Vector Addition Equations Description Explore vectors in 1D or 2D, and discover how vectors add together. Specify vectors in Cartesian or polar coordinates, and see the magnitude, angle, and components of each vector. Experiment with vector equations and compare vector sums and differences. Sample Learning Goals Describe a vector in your own words Explain a method to add vectors Compare and contrast the component styles Decompose a vector into components Describe what happens to a vector when it is multiplied by a scalar Arrange vectors graphically to represent vector addition or subtraction
Topics Resistivity Resistance Circuits Description Observe changes to the equation and wire as you play with the resistivity, length, and area sliders. Sample Learning Goals Predict how changing each variable will affect the resistance. Explain the difference between resistance and resistivity.
Topics Atoms Atomic Structure Isotope Symbols Atomic Nuclei Description Build an atom out of protons, neutrons, and electrons, and see how the element, charge, and mass change. Then play a game to test your ideas!
Topics Gas Diffusion Thermodynamics Description Mix two gases to explore diffusion! Experiment with concentration, temperature, mass, and radius and determine how these factors affect the rate of diffusion.
Topics Periodic Motion Simple Harmonic Motion Conservation of Energy Period Pendulum Description Play with one or two pendulums and discover how the period of a simple pendulum depends on the length of the string, the mass of the pendulum bob, the strength of gravity, and the amplitude of the swing. Observe the energy in the system in real-time, and vary the amount of friction. Measure the period using the stopwatch or period timer. Use the pendulum to find the value of g on Planet X. Notice the anharmonic behavior at large amplitude. Sample Learning Goals Design experiments to determine which variables affect the period of a pendulum Quantitatively describe how the period of a pendulum depends on these variables Explain the small-angle approximation, and define what constitutes a “small” angle Determine the gravitational acceleration of Planet X Explain the conservation of mechanical energy, using kinetic energy and gravitational potential energy Describe the Energy Graph from t...
Topics Molecules Photons Absorption Light Description Turn light source on to explore. Observe what happens in the observation window as you set up different combinations of light source and molecule. Note this simulation is the first to support our pan and zoom feature, so zoom in for a closer look, if you need to. Sample Learning Goals Explore how light interacts with molecules in our atmosphere Identify that absorption of light depends on the molecule and the type of light Relate the energy of the light to the resulting motion Identify that energy increases from microwave to ultraviolet Predict the motion of a molecule based on the type of light it absorbs Identify how the structure of a molecule affects how it interacts with light
Are you free? we often think we are free but are we really free? this question sounds so simple yet it is actually not. What does it even mean to be free? Well in this post I will explain to the best of my knowledge what is free will and whether we have it or not. can you escape fate? Let's consider the story below: When Thabiso was born a prophet foretold that he would grow up to kill his father and then marry his mother. His father fearing for his life decided to leave the baby in the wilderness with the hope that he will die, thefore the prophecy will not come true. The baby was found by another couple, and grew up knowing them as his parents. The boy heard of the prophecy, not knowing his adopted and because he loves his father(adopted) he decided to go away from his family to avoid the prophecy. In the way he met and killed a man and then felt bad for the wife of this man, he decided to marry her. The man he met is in fact his fat...
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