L1 1 March 05, 2018 Jan 193:53 PM Unit 3: Physical Science Motion Feb 203:21 PM Motion Things in motion Description of Motion
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March 05, 2018
Jan 193:53 PM
Unit 3: Physical Science
Motion
Feb 203:21 PM
Motion
Things in motion
Description of Motion
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March 05, 2018
Feb 203:29 PM
Uniform Motion Straight‐line motion at a constant speed. Equal distances are covered in equal time intervals.
Examples :
• Cruise control
• walking or running at a constant speed
• bowling
• swimming in lanes
Feb 203:48 PM
Qualitative Description : A description made by observing with the senses.
e.g. Sam runs faster than Jack
Quantitative Description : A description based on a measurement.
e.g. Sam runs at 2.0m/s while Jack runs at 1.8 m/s
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March 05, 2018
Feb 1811:09 AM
Units
‐Most measurements are useless to us without units
This building is 8 Pats tall
MAX20,000
mm/s
Using inappropriate units also causes confusionSPEED
This cat weighs 52
Feb 1811:09 AM
SI Units‐ Le Systeme International d'Unites
‐single system agree on by scientists worldwide
‐ seven base units + other derived units
These are the ones we will use
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March 05, 2018
Feb 1811:09 AM
SI Units http://www.youtube.com/watch?v=g0OAFS5K8h8
Feb 248:48 PM
Converting Base Units
"King Henry's Daughter Bakes Delicious Chocolate Muffins"
Go right= x 10
Go left = /10
K H da base d c m
kkilo
H hecta
da deka
d deci
mmili
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March 05, 2018
Feb 173:39 PM
You Try!
Convert�the�following�using�the�stair�method
a)�31.6�cm�=�______m
b)�2.6�kL�=�_____mL
c)�40�g�=�______�mg
d)�2000�hm�=�_____km
e)�45�g�=�________kg
f)�1�200�mm�=�______km
Feb 174:12 PM
Method 2: Converting Units (Derived Units)
Ex: Convert 100 km/hr to m/s
Hint: To change from km/hr to m/s we ÷ by 3.6
To change from m/s to km/hr we x by 3.6
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March 05, 2018
Feb 222:57 PM
Examples: Convert the following
1) 270 m/s to km/hr
2) 50 km/hr to m/s
3) Convert your age into minutes
Feb 173:40 PM
Converting Base UnitsThe Step Stair Method is asimple trick to converting these units.
Ex: To go from mg to Dg we move up 4 steps, so we divide by 10
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Larger unit as you go up the steps! Divide by a power of ten 10
Ex: To go from Km to cm we move down 5 steps, so we multiply by 10
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Smaller unit as you go down the steps! Multiply by a power of ten 10
Kilo�(k)
Hecta�(h)
Deka�(D)
Base�Unit�(meters,�grams,�liters,�etc.)
Deci�(d)
Centi�(c)
Mili�(m)
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March 05, 2018
Feb 192:23 PM
Examples: Convert the following
1) 2700 cm2 to m2
2) 250 hm2 to m2
3) 7 km3 to m3
Feb 207:57 PM
Examples: Convert the following
1) 270 mm/s to m/s
2) 50 km/min to m/s
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March 05, 2018
Feb 2411:04 AM
x 60 x 60
÷ 60 ÷ 60
Converting Units Time go right = x 60
go left = ÷ 60
• h → min → sExamples: Convert the following
1) 2700 s to hr
2) 250 min to hr
3) 7 hr to s
Feb 2011:03 AM