Physical Science Chapter 6: Motion and Momentum

Vocabulary Words	Objective Questions
6-1  What is motion?	page 166
speed average speed instantaneous speed velocity displacement relative motion distance-time graph	How do we know an object is in motion? Compare distance and displacement. Draw a picture to help illustrate your answer. Is the speed of an object important? Why? How do you calculate speed? What is the purpose of a distance-time graph? What is the diffence between average speed and instantaneous speed? Give examples.
6-2  Acceleration	page 172
acceleration positive acceleration negative acceleration speed-time graph	When does an object accelerate? How do you calculate acceleration? What is the purpose of speed-time graph? Compare positive and negative acceleration.
6-3 Momentum	page 177
mass inertia momentum law of conservation of momentum	How do you find an object's momentum? What happens to an object's momentum when it hits another object? What happens when they stick together? What happens when they bounce off each other?

* Accidents in Science:  What goes around comes Around  pages 186-187