# Virtual Labs

Related:  Forces and Energy

Physics and Motion The Shockwave Physics Studios consists of a collection of pages which feature interactive Shockwave files that simulate a physical situation. Users can manipulate a variable and observe the outcome of the change on the physical situation. Many of the animations are accompanied by an activity sheet which provides directions and procedural information for users. Such activity sheets were designed so that the animation could become a classroom-ready activity for use by students and teachers. Name That Motion Refine your understanding of the language of kinematics as you match 11 verbal descriptions of motion to 11 on-screen animations. View: Animation || Activity Sheet Graph That Motion Refine your understanding of the graphical descriptions of motion as you match 11 position-time and velocity-time graphs to 11 on-screen animations. View: Animation || Activity Sheet Graphing Motion Practice your skill at interpreting graphs. View: Animation Two-Stage Rocket View: Animation || Activity Sheet

Momentum Car Crash Webquest Introduction Introduction A traffic accident occurred in a 35 km/hr speed limit zone on Millway Street in which a 3000-kg Cadillac Escalade SUV rear-ended a 2000-kg Subaru Outback Wagon that was stopped at a stop sign. The entire police investigative division has gone on vacation to Bora Bora to relax, so the mayor has contracted with you and your team of experts to determine what happened and what traffic laws were broken. Task Your team will provide the mayor with a detailed accident report (including all equations and work) that includes mass, velocity, and momentum of both vehicles both prior to and after the collision. The mayor has provided you with the following diagram drawn by police officers at the site of the accident: Process Each group member will choose one of the following roles. Evaluation Work will be evaluated based on the attached rubric. Conclusion Teacher Notes

Drawing Free-Body Diagrams Free-body diagrams are diagrams used to show the relative magnitude and direction of all forces acting upon an object in a given situation. A free-body diagram is a special example of the vector diagrams that were discussed in an earlier unit. These diagrams will be used throughout our study of physics. The size of the arrow in a free-body diagram reflects the magnitude of the force. The free-body diagram above depicts four forces acting upon the object. Practice Apply the method described in the paragraph above to construct free-body diagrams for the various situations described below. A book is at rest on a tabletop. Answers Answers to the above exercise are shown here. 1. Return to Questions Return to Info on Free-body diagrams Return to on-line Force Description List 2. 3. 4. 5. 6. 7. 8. 9. 10. 11.

Electricity & Magnetism: Electric Fields Scientists understood why forces acted the way they did when objects touched. The idea that confused them was forces that acted at a distance without touching. Think of examples such as gravitational force, electric force, and magnetic force. To help them explain what was happening, they used the idea of "field". They imagined that there was an area around the object, and anything that entered would feel a force. We say, for example, that the Moon has a gravitational field around it, and if you get close to the Moon, it will pull you down to its surface. A normal field is a vector, and is represented by arrows. For an electric field, things are a little more complicated, since there are two kinds of charges, and some combinations attract while others repel. Since fields are directly related to the forces they exert, their strength decreases with distance, and increases with the size of the charge producing the field. Electric fields can also be created by magnetic fields.

Electricity & Magnetism: Magnetic Fields Magnetic fields are different from electric fields. Although both types of fields are interconnected, they do different things. The idea of magnetic field lines and magnetic fields was first examined by Michael Faraday and later by James Clerk Maxwell. Magnetic fields are areas where an object exhibits a magnetic influence. If you place an object in a magnetic field, it will be affected, and the effect will happen along field lines. You know about charged particles. Magnets are simple examples of natural magnetic fields. As noted earlier, current in wires produces a magnetic effect.

Exploring Magnetic Fields Purpose To reinforce the concept that magnets attract and repel items and exert a magnetic field that can vary in strength. Context By exploring magnets, students are indirectly introduced to the idea that there are forces that occur on earth which cannot be seen. They also should have become familiar with the poles of each magnet and observe for themselves the differences between the north and south sides of the magnet. In this lesson, students will see evidence of the magnetic field of a small magnet. Planning Ahead Gather the materials for both parts of the activity and perform the experiments yourself before you do them with the students. Motivation Begin by asking students to discuss their experiences with magnets. Development The first part of this lesson is a hands-on exploration of magnetic fields using the Exploring Magnetic Fields: Activity 1 student sheet. Allow students to work in pairs or small groups to carry out the activity. Then discuss these questions: Assessment Extensions

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