1. Chapter 1
Motion

2. Describing and Measuring Motion
Motion: the state in which an object’s distance from another object changes.
-Whether or not an object is moving depends on the person’s point of view.
Reference Point: a place or an object used for comparison to determine if something is in motion.

3. An object is in motion if it changes positions relative to a reference point.

4. Are the bike riders moving in relation to one another?
NO! because their distance from one another is not changing

5. Describing Distance Distance: how far an object has traveled
measured in length
Displacement- distance and direction of an object’s change in position from starting point

6. Calculating Speed Speed: the distance the object travels in one unit
of time.
A type of rate: tells you the amount of something that occurs or changes in one unit of time.
Average Speed = Distance = m
Time s

7. Type of Speed
Description
Example
Instantaneous
Speed at any given point in time
Driving a car and looking down to read the speedometer
Average
Total distance traveled divided by the total time
Taking a road trip
Constant
Speed that does not vary
putting car in cruise control

8. Velocity
When you know both the speed and direction of an object’s motion, you know the velocity.
Velocity: speed in a given direction

9. Graphing Motion Distance (m) Time (min)
Time is plotted on the horizontal axis and distance is plotted on the vertical axis. A steeper line indicates a greater speed

10. Graphing Motion Slope: the steepness of the line on a graph
Tells you how fast one variable changes in relation to the other variable
Represents the rate of change of distance in relation to time
Slope = rise = distance
run time
The steeper the slope, the greater the speed.
When slope equals zero, the line is horizontal and the object is NOT MOVING!!

11. Graphing Motion Distance (m) Time (min)
Slope is steeper = Object is moving faster
Slope is not as steep = object is moving slower.
Distance (m)
Time (min)

12. Graphing Motion Distance (m) Time (min)
Object is NOT IN MOTION when the line is horizontal
Distance (m)
Time (min)

13. Acceleration
the rate at which velocity changes.

16. Calculating Acceleration
Acceleration (m/s2) = Change in Velocity
Time
 Note** Change in velocity = final velocity-initial velocity
  Change in v = vf - vi   
Formula for Acceleration
Acceleration = vf - vi = m/s2 t

19. Graphing Acceleration
Linear relationship: the graphed
line rises the same
amount each second. 
Nonlinear relationship: the graph of distance versus time is a curved line.
The distance traveled by the
accelerating object varies
each second.