1. Measuring Motion
Chapter 1 Section 1

2. Observing motion by using a reference point
Reference point – an object that appears to be stationary or mobile. An object used to compare another object in motion.
Reference direction – Used to describe the direction of an object’s motion.
Up, down, north, south, east and west
Motion – an object’s change in position relative to a reference point.

3. Speed Depends on Distance and Time
Speed – is the distance traveled by an object divided by time taken to travel that distance
The SI unit for measuring speed is meters per second (m/s), or kilometers per hour km/h.

4. Determining Average Speed
Most of the time objects do not travel at a constant speed. It is useful to calculate average speed.
Average speed = total distance
total time

5. Let’s Graph IT!

6. Velocity – Direction matters
Velocity – the speed of an object in a particular direction.
Velocity must include a reference direction.

7. Velocity Changes
Velocity changes only if one of the following two factors that make up velocity changes
Speed
Direction
Constant velocity is motion in a straight line.