## Keeping Track of Momentum (Hit and Stick Collisions) - Directions

### How it Works:

Using the Keeping Track of Momentum (Hit and Stick Collisions) Concept Builder is quite simple. There are three different difficulty levels, each with the same emphasis but noticeably different question difficulty. For each difficulty level you will be presented with a description of a collision. Information about the momentum of the two colliding objects (Apprentice Difficulty Level) or the mass, speed, and direction of the two colliding objects (Master and Wizard Difficulty Level) is provided. You must analyze the written information and use it to complete a Momentum Table. The Momentum Table displays the momentum of the two colliding objects and of the system of two objects before and after the collision. The change in momentum of the two individual objects and of the system of two objects is also displayed in the table. Entering the momentum values is easy. Simply tap on the cell of the table and use the built-in number pad to enter the values. Once typed in, you can either tap on the Enter button or tap on a different table cell in order to enter another value. Once all the values have been entered, you can tap on the Check Answer button. Your answers will be evaluated and feedback will be given. Red dots will be used to indicate any incorrect values or any values that have not yet been entered. You will be allowed an endless number of opportunities to determine the correct answers; you will not receive the next question until the table is correct and complete. You can use the Help Me! button for assistance.

Your goal is to earn "Stars" and to complete one or more of the difficulty levels. Stars are earned when you demonstrate success with a particular question. Once you show success on all the situations at a particular difficulty level, you will earn the trophy for that level.

### Earning Stars

There are three difficulty levels in this Concept Builder. When you start up any of these difficulty levels, the number of questions for that activity 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 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

Thanks for being patient with the Directions. Happy learning!