1. Motion Vocabulary and Concept Review
8th Grade Science
Ms. McKinley

2. Position The location of an object 3 things you need
REFERENCE POINT
DISTANCE FROM THE REFERENCE POINT
DIRECTION FROM REFERENCE POINT
Example: James is standing 10 METERS WEST of the FLAGPOLE.

3. Reference point
A starting point used to describe the position of an object.

4. Vector Anything that has both MAGNITUDE (size) and DIRECTION.
Example: Position is a vector b/c it has distance (size) and direction.
Other examples: Velocity, Force

5. Speed The rate of change of distance over time
How fast/slow something moves
Example: Usain Bolt can run at a speed of 10.4 m/sec

6. Instantaneous Speed The speed at any given moment.
The speedometer in a car measures instantaneous speed.
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7. Constant Speed
An object moving at constant speed travels the same distance each second.
Speed is not increasing or decreasing.

8. Average Speed Average speed = TOTAL DISTANCE ÷ TOTAL TIME
Average speed is NOT the speed at one given moment.
It’s a summary of the speed an object travelled

9. Speed Equation Triangle!

10. Let’s practice…
Calculate the speed of Michael Phelps, who swam 100 m butterfly stroke in seconds.

11. 2. If a swimmer swims at a speed of 1
2. If a swimmer swims at a speed of 1.4 m/s, how far will he swim in 140 seconds?

12. A train travels from Los Angeles, CA to Phoenix, AZ
A train travels from Los Angeles, CA to Phoenix, AZ. If the train travels at a speed of 68 km/h, how long will it take to travel 420 km?