physics
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Physics. Science 1206 Unit 4: Motion. Physics : the science that deals with matter, energy, motion and force. Measurement, Units, & Error. How would you describe this motion?. Measurement, Units, & Error. Qualitative: Description of observation, not measured - PowerPoint PPT PresentationTRANSCRIPT
Physics
Science 1206 Unit 4: Motion
Physics: the science that deals with matter, energy, motion and force
Measurement, Units, & Error
How would you describe this motion?
Measurement, Units, & Error
Qualitative: Description of observation, not measured example: big/small, quiet/loud, fast/slow
Quantitative: Numerical, measured example: 7ft tall, 30 km/hr
GO SLOW
Max50km
/hr
Which is more useful?
Measurements, Units, and Error
Units
-Most measurements are useless to us without units
This building is 8 Pats tall
MAX20,000
mm/s
-Using inappropriate units also causes confusion
SPEED
This cat weighs 52
Measurement, Units, & Error
SI Units http://www.youtube.com/watch?v=g0OAFS5K8h8
Measurement, Units, & Error
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
Measurement, Units, & Error
Derived units- the ones we get from manipulating (adding, dividing, multiplying) existing base units
Examples:Area= Length x Width Speed= Distance / TimeArea= m x m = m2 Speed= Km/ hr or m/s
5m
6m
50 km in 1 hr = 50 km/hr50 km in 1/2 hr = 100 km/hr
Measurement, Units, & Error
k h da Base d c m
Measurement, Units, & Error
Converting Units
k h da Base d c m
Left to Right = x10
Right to Left = /10
King Henry's Daughter Bakes Delicious Chocolate Muffins
kilo hecto deka deci centi milli
*Time
Measurement, Units, & Error
k h da Base d c mkilo hecto deka deci centi milli
Practice converting the following:
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
Remember!
Measurement, Units, & Error
Converting Derived Units
Ex: Convert 100 km/hr to m/s
Hint: To change from km/hr to m/s ÷ by 3.6 To change from m/s to km/hr x by 3.6
100 km 1 hr 60min 1000mx x x = 27.8 m/s1hr 60 min 3600 sec 1km
Measurement, Units, & Error
Converting Derived Units
Ex. Convert 5700 cm2 to m2
Measurement, Units, & Error
Converting Derived Units
Ex. Convert 5700 cm2 to m2
5700 cm x cm 1m 1m
100 cm 100 cm x x1 = 0.57
m2
Measurement, Units, & Error
Converting Derived Units
Ex. Convert 5700 cm2 to m2
5700 cm x cm 1m 1m 1 100 cm 100 cm
x x = 0.57 m2
-For a unit2 times the number of decimal places you otherwise move by 2-For a unit3 times the number of decimal places you would otherwise move by 3
Measurement, Units, & Error
Converting Derived Units
Ex. Convert 5700. cm2 to m2
5700 cm x cm 1m 1m
100 cm 100 cm
x x1 = 0.57 m2
-For a unit2 times the number of decimal places you otherwise move by 2-For a unit3 times the number of decimal places you would otherwise move by 3
Measurement, Units, & Error
Converting Derived Units
Ex. Convert 4300 mm3 to cm3
-For a unit2 times the number of decimal places you otherwise move by 2-For a unit3 times the number of decimal places you would otherwise move by 3
Remember!
Measurement, Units, & Error
Converting Derived Units
Ex. Convert 4300 mm3 to cm3
- mm to cm is 1 decimal place to the left- mm3 to cm3 should be 3 decimal places to the left
4300.0 mm3 = 4.3cm3
Measurement, Units, & Error