JC Science - Measurements + Units

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38 Terms

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SI unit
Standard unit used around the world
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SI unit for length
Metre
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SI unit for mass
Kilogram
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SI unit for time
Second
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SI unit for temperature
Kelvin
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Length
-Cm, m, km
-Length is a measure of distance
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Instruments to measure length
-Metre stick
-Opisometer
-Trundle wheel
-Venir callipers
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Opisometer
knowt flashcard image
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Venir callipers
knowt flashcard image
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Mass
-g, kg, ton
-Mass is a measure of how much matter something contains
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Mass instruments
Electronic balance
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what is Time

-s, m, h -A way of measuring + expressing duration

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Time instruments
Clock
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Temperature
-Kelvin, celcius + fahrenheit
-Temperature is a measure of how hot something is
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0 degrees Kelvin in Celcius
-273
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Instruments to measure temperature
Thermometer
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what is Area

-A measure of the size of a surface of an object -Unit squared

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Calculating the area of a rectangle + square
Length x width
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Calculating area of irregularly shaped figures
Trace onto graph paper + count the number of squares covered
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Calculating the surface area
-Calculate 1 side of a square then multiply by 6
-2(wxl)+2(lxh)+2(hxw)
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Calculating volume of regularly shaped boxes
LxWxH
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Calculating volume of liquid
Pour liquid into a graduated cyliner
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Calculating volume of irregular objects
Overflow can + graduated cyliner
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Using overflow can
1. Set up equipment
2. Fill overflow can with water
3. Place measuring cylinder under the can
4. Drop rock in
5. Measure the volume of water
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Meniscus
-Curved surface of liquid in a graduated cylinder
-Always take the reading from the bottom of the meniscus
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Precision
How close the measured values are to each other
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Accuracy
How close a measured value is to the true value
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Volume
cm3
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Velocity
m/s
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Energy
Joule
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Current
amp, cm2
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Force
Newton
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Density
g/cm3 or gcm-3
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Heat
°C
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Dividing force by area
Pascal
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Acceleration
m/s2
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Moment of forc
Nm
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Power
Watt