Motion Vocabulary and Concept Review

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Presentation transcript:

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

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.

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

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

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

Instantaneous Speed The speed at any given moment. The speedometer in a car measures instantaneous speed. Page 57

Constant Speed An object moving at constant speed travels the same distance each second. Speed is not increasing or decreasing.

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

Speed Equation Triangle!

Let’s practice… Calculate the speed of Michael Phelps, who swam 100 m butterfly stroke in 51.2 seconds.

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?

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?