Every Saturday we highlight three resources that have received particularly heavy traffic from website visitors during the past week. This week's winners are …
One of our top Tutorial pages this week was our page on the Momentum Conservation Principle. This is a second page of a six-page lesson focusing on how to understand and analyze a collision or an explosion. The page begins with a logical presentation of the basis for the law of momentum conservation. It then explains the meaning of momentum conservation using an analogy with money conservation in a financial transaction. The two characteristics of momentum conservation are clearly described: the momentum change of one object is equal and opposite to that of a second object and the total system momentum is the same before and after the collision or explosion. The page combines graphics, tables of numerical data, examples, videos and a Check Your Understanding section to bring learners to a clear understanding of what momentum conservation involves.
2. Wavelength Concept Builder
The Wavelength Concept Builder is a tool that guides a learner through the meaning of wavelength as the length of the repeating pattern towards being able to calculate the wavelength if given a pattern and the length of the pattern. There are three activities included in this Concept Builder. The first activity - Wave Anatomy - provides the learner practice with identifying crests and troughs in a transverse wave pattern and compressions and rarefactions in a longitudinal wave pattern. In the second activity - Counting Waves - learners must determine the number of waves displayed in a transverse wave pattern. In the third activity - Determining Wavelength - learners calculated the wavelength of a wave when provided a transverse wave pattern and the length of the given pattern.
3. Collision Carts at The Physics Interactives
This week's top Interactive was the Collision Carts Interactive. This Interactive allows learners to explore the conservation of momentum for collisions and explosions. The pre-collision mass and velocities can be set and the post-collisions velocities can be used to determine the total system momentum. A couple of ready-to-use exercises are available for teachers who wish to use the Interactive with their classes. The Interactive works well on tablets such as the iPad, on Chromebooks, and on mobile devices, making it a perfect tool for the 1:1 classroom.
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