Equilibrium - Directions

 

How it Works:

Using the Equilibrium Concept Builder is quite simple. There are three difficulty levels and each difficulty level involves the same task - you are given one or more angled forces and you must add one east-west force and one north-south force to the object in order to establish an equilibrium. Above the grid with the angled forces is a button titled Add a Force. Tapping on this button pops up the Force Pad along the right side of the Concept Builder. You can tap on the Direction button to toggle through the four possible directions of the added force - east, north, west, south, repeat. Once you are satisified with the direction (you can always change it later), you can tap on the force buttons to set the magnitude of the added force. The force is immediately drawn on the diagram as a blue arrow. Its magnitude and direction are shown below the diagram. You have to repeat this process for a second force. One of the forces must be east or west and the other force must be north or south. There will be blue arrows for these two forces on the diagram. As long as you have two forces in these directions, a Check Answers button will be visible. If you wish to edit a force, simply tap on the force field below the diagram; this will pop up the Force Pad and you can alter your force. Once you are finally satisfied with your answer, tap on the Check Answers button. Feedback will be immediate and your Progress Report will be updated. Your goal is to earn "Stars" and to complete one or more difficulty levels. Stars are earned when you show success on a particular question. Once you show success on all the questions at a particular difficulty level, you will earn the Trophy for that level.

 

Earning Stars

When you start up any level of difficulty, the number of questions for that level are shown in the Progress Report area of the Concept Builder. You will notice that there is either a Yellow or a Red background for each question number. When starting up a difficulty level, the background color is Yellow. Answering a "Yellow" question correctly earns you a star for that question number. However, answering it incorrectly turns the background color to Red. A question number with a Red background must be correctly answered twice (without a miss) in order to earn a star. 


 

Getting Help

You will notice that there is a Help Me button underneath the Progress Report. You should learn to use this feature of the program. It's how you can turn an exercise in answering questions into an exercise in learning. Tapping on the Help Me button will open a page with help that is specific to each question. Of course, the Help pages are only helpful if you read them. So take the time to read them. Each Help page contains four sections: a discussion of the The Basic Idea, a sample question from the Question Group, a section titled "How to Think About This Situation", and a set of links to resources in our Tutorial section. You should pay attention to the section titled How to Think About This Situation. You will find what you need to know in the two or three paragraphs of this section. You will also become a better Physics student for doing that. That is, after all, the goal of such an activity as Equilibrium.

Thanks for being patient with the Directions. Happy learning!