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17 Cards in this Set
- Front
- Back
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Why do we use measurement?
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To build things
A form of communication |
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What are some ex. Of how we use them?
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Math- perimeter etc.
Doctors- height, weight, blood pressure etc. Cooking or Building |
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Do we always need specific measurements?
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No, it depends
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Rules with measurements
All measurements have: |
units
Measurements use decimals Error The last digit is estimated One value past what the scale shows |
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What are units
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Inches, centimeters, liter, gallons, grams, ounces, mph,
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. Describing and Measuring Motion
A. Objectives |
1. Determine when an object is in motion
2. Calculate an object's speed and velocity 3. Demonstrate how to graph motion. |
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Describing motion
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An object is in motion if its distance from another object is changing.
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How do you determine this?
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. if the distance between the object and its reference point is changing.
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What is a reference point?
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. A place or object used for comparison to determine if something is in motion.
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What makes a good reference point.
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Non moving
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Relative motion
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Motion depends on the reference point.
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Just like sitting on a moving train-
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1.you seem like you are not moving---just sitting
2. Relative to the train you are not moving 3. Relative to the ground you are |
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Measuring Distance
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A. scientists use a system of measurement called the International System of Units, or SI
B. Common prefixes 1. Centi= 2. milli= 3. Kilo= |
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Calculating speed
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To calculate speed, the distance must be known, and the time it took to travel that distance must be known
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What is speed
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B. Speed is a rate- something calculated per unit of time.
C. Speed= Distance/Time |
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Average Speed
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Most speed is not constant
1. Average speed= total distance/ total time |
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Instantaneous Speed
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The rate of an object is moving at a given instant in time.
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