Collision Course

2. a measure of how quickly an object is moving in a given direction
3. a limit or restriction on a design
5. the amount of matter in an object, measured in kilograms
6. the rate at which the velocity of an object changes over time
8. the requirements a design has to meet to be successful
9. The act of two objects hitting each other with force
10. The process of repeating something, such as a set of steps or a procedure, usually in order to get closer to a desired result
11. forces (pushes and pulls) that are not equal to one another
15. a type of force acting in one direction

1. A law in physics that states that when two objects interact, they exert forces upon each other
4. A push or a pull that causes an object to change its motion (that is, start moving, stop moving, or change direction)
5. the act or process of changing position or location
7. a type of force acting in the direction opposite to the action force
12. Forces acting on an object that are equal in size but act in opposite directions, resulting in no change of movement
13. an early model or design that is created for testing or evaluation
14. How fast something is moving or the rate at which it moves—it is calculated as distance over time