PhET Interactive Simulations

Step 1: Open the Circuit Construction Kit: DC simulation.

Step 2: Build a simple circuit with a battery, resistor, and ammeter.

Step 3: Vary the voltage of the battery and observe the change in current.

Step 4: Change the resistance of the resistor and observe the change in current. Explain Ohm's Law: V = IR.

Step 1: Open the Reactants, Products, and Leftovers simulation.

Step 2: Select a chemical reaction to explore, such as the formation of water.

Step 3: Add different amounts of reactants and observe the formation of products.

Step 4: Identify the limiting reactant and the amount of leftover reactants.

Step 1: Open the Forces and Motion: Basics simulation.

Step 2: Apply a force to an object and observe its motion.

Step 3: Vary the mass of the object and observe the change in acceleration.

Step 4: Introduce friction and observe its effect on the object's motion.

Step 1: Open the Gas Properties simulation.

Step 2: Add gas molecules to the container and observe the pressure.

Step 3: Change the volume of the container and observe the change in pressure.

Step 4: Heat the container and observe the change in pressure and volume.