This is another site full of good physics simulations which could be used to help students explore different topics in physics. These simulations may explore topics which are too complicated for students to directly explore in classroom experiments, or topics which are typically confusing for students.
This is an Amazing resource for modeling science topics with simulations! Run by the University of Colorado at Boulder, there are tons of interactive simulations including ones I've used in my classes that are very helpful in visualizing certain topics. The website also has shared activities from teachers across the country including lesson plans, homework, demos, and labs for all grade levels!
This resource I found through Google search helps students understand different physics phenomena. These simulations show the students the physics behind various topics such as forces and motion.
This page gives links to many resources which could be used to enrich physics instruction at the secondary level. Some examples of the resources are an examination of the physics of race cars, roller coasters, and links to some simulations.
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