Is it possible to defy gravity? Not really. With force and inertia, we can act against it for a little while, but, eventually, gravitational force will pull us back to Earth. The relationships among mass, force, and inertia are all...

Budding scientists fall hard for a gravitational field strength activity! Physics pupils compare the masses and distances relative to the center of planets using an interactive from a Circular and Satellite Motion series. Individuals...

Why do many tightrope walkers use a balancing pole? The simulation explores the benefits of balancing poles and the features that are most important. Pupils control the pole length, pole mass, pole stiffness, and the initial angle of...

In this online interactive history worksheet, students respond to 10 short answer and essay questions about Sigmund Freud and his work. Students may check some of their answers on the interactive worksheet. 

In this interactive prepositions worksheet, learners practice using prepositions in sentences. Students choose the correct preposition for each blank in the passage. There are fifteen in all.

Estimate the location of the center of mass of systems of particles. You will have one minute to estimate as many centers of mass as possible.

Find the center of mass of a one dimensional system of 2 particles.

Find the center of mass of a one dimensional system of 3 particles.