## What's new in December 2016

Punnett Square - Dihybrid Cross - Exerciser 1

- This interactive exerciser lets you practice completing the Punnett square for a dihybrid cross between two parents. Based on the parent alleles, which randomly change for each question, determine the possible allele combinations of the offspring to complete a 4x4 Punnett square.

*NGSS: Life Sciences MS-LS3-2. Develop and use a model to describe why asexual reproduction results in offspring with identical genetic information and sexual reproduction results in offspring with genetic variation.**HS-LS3-1: Ask questions to clarify relationships about the role of DNA and chromosomes in coding the instructions for characteristic traits passed from parents to offspring.*

DIY Projectile Motion 3 - Monkey and the Hunter experiment

- Explore the popular monkey and the hunter (a.k.a shoot the monkey) physics thought experiment on projectile motion. Have fun with our modern version of this thought experiment, which is complete with retrofitted drones carrying laser cannons and targets triggered to fall automatically.

*NGSS: Physical Sciences HS-PS2-1: Analyze data to support the claim that Newton’s second law of motion describes the mathematical relationship among the net force on a macroscopic object, its mass, and its acceleration.**MS-PS2-2: Plan an investigation to provide evidence that the change in an object’s motion depends on the sum of the forces on the object and the mass of the object.*

DIY Gravitation - Geosynchronous & Geostationary Satellite Orbits

- This interactive explores launching of artificial satellites into different geosynchronous orbits, including the special case of a geostationary orbit.

*NGSS: Earth Sciences MS-ESS1-2: Develop and use a model to describe the role of gravity in the motions within galaxies and the solar system.**NGSS: Physical Sciences HS-ESS1-4: Use mathematical or computational representations to predict the motion of orbiting objects in the solar system.**MS-PS2-4: Construct and present arguments using evidence to support the claim that gravitational interactions are attractive and depend on the masses of interacting objects.*

DIY Wave characteristics - Interactive Graph

- This activity involves interactive graphs featuring displacement-time and displacement-distance representations of a sine wave, where the particle displacement is measured from the mean position. The waveforms change interactively as you change the frequency, wavelength, and amplitude.

*NGSS: Physical Sciences MS-PS4-1: Use mathematical representations to describe a simple model for waves that includes how the amplitude of a wave is related to the energy in a wave.**HS-PS4-1: Use mathematical representations to support a claim regarding relationships among the frequency, wavelength, and speed of waves traveling in various media.*

DIY Wave Properties - Interference 1 - Interactive Graph

- This interactive graph lets you explore the interference (superposition) between two sinusoidal waves. Change the values for frequency, amplitude, and phase offset for the two waves and observe the resultant wave.

*NGSS: Physical Sciences MS-PS4-1: Use mathematical representations to describe a simple model for waves that includes how the amplitude of a wave is related to the energy in a wave.**HS-PS4-1: Use mathematical representations to support a claim regarding relationships among the frequency, wavelength, and speed of waves traveling in various media.*

DIY Boiling Point - Geographical elevation above MSL

- This interactive investigates how the boiling point of a liquid is affected by the ambient pressure, which in turn changes with the geographical elevation above mean sea level (MSL). Different places on Earth, for e.g. NY city, Denver, Mt Everest, etc. have different elevations above MSL.

*NGSS: Physical Sciences HS-PS1-3: Plan and conduct an investigation to gather evidence to compare the structure of substances at the bulk scale to infer the strength of electrical forces between particles.**MS-PS1-4: Develop a model that predicts and describes changes in particle motion, temperature, and state of a pure substance when thermal energy is added or removed.*

DIY Capacitance 1 - Electrical Potential Energy

- This interactive explores the process of storing electrical energy by charging a capacitor and using this energy on demand by discharging the capacitor.

*NGSS: Physical Sciences HS-PS3-2: Develop and use models to illustrate that energy at the macroscopic scale can be accounted for as a combination of energy associated with the motions of particles (objects) and energy associated with the relative position of particles (objects).**MS-PS2-5: Conduct an investigation and evaluate the experimental design to provide evidence that fields exist between objects exerting forces on each other even though the objects are not in contact.*

DIY Electrical Circuits - Resistance in Series - Explorer 1

- This interactive explores the effect of resistors in series on the current flowing through the circuit and the voltage drop across each resistor in the given circuit. You can try out the circuit multiple times, with different values for battery voltage and resistors each time.

*NGSS: Physical Sciences MS-PS2-3: Ask questions about data to determine the factors that affect the strength of electric and magnetic forces.**HS-PS2-5: Plan and conduct an investigation to provide evidence that an electric current can produce a magnetic field and that a changing magnetic field can produce an electric current.*

DIY Electrical Circuits - Resistance in Parallel - Explorer 1

- This interactive explores the effect of resistors in parallel on the current flowing through the main circuit branch and through each of the parallel branch. You can try out the circuit multiple times, with different values for battery voltage and resistors each time.

*NGSS: Physical Sciences MS-PS2-3: Ask questions about data to determine the factors that affect the strength of electric and magnetic forces.**HS-PS2-5: Plan and conduct an investigation to provide evidence that an electric current can produce a magnetic field and that a changing magnetic field can produce an electric current.*