Measurment Flashcards
What is length ?
Length is the distance between two points
What is the SI unit ?
Metres
What instrument do we use to measure length ?
Ruler , metre stick , vernier callipers , trundle wheel and opisometer
What are units for length?
Millimetre (mm) , centimetres (cm) , metres (m) , kilometres (km)
What is the function of vernier callipers ?
To measure the diameter of a circular object eg.coin
What is he function of a trundle wheel ?
To measure a long curved line eg. Football pitch
What is the function of a opisomiter ?
Used to measure the length of a curved line for a short distance eg. Road on a map
What does accuracy mean?
Accuracy means how close a measured value is to its actual value.
What could lead to errors in a measurement result ?
Parallax error , zero error
What is parallax error ?
Reading the measurement form the incorrect angel
What is a zero error ?
When you don’t your measurement stat at zero on a measurement instrument
How many mm are in cm ?
10
How many mm are in a m ?
1,000
How many cm are in a m ?
100
How many m are in a km ?
1,000
How do u convert cm to m ?
Divide by 100
How do you covert m to cm
Multiply by 100
How do u convert km to m ?
Multiply by 1,000
How do u convert m to km ?
Divide by 100
How do you convert mm to m ?
Divide by 1,000
How you convert m to mm ?
Multiply by 1,000
What is area ?
The area of an object is the amount of surface enclosed within its lines
How do you calculate area ?
Length x width
How do u calculate the area of an irregular shape ?
Trace the outline of the shape onto grid paper , then count the total box (each box is 1cm2), boxes less than half filled are not counted , over half is counted as 1cm2. Boxes half filled count as 0.5cm2
What is volume ?
Volume is the amount of space that an object take up
How do u read the meniscus ?
You read it at eye level and below the meniscus.
How do u find the volume of a regular object?
Length x width x height
What is the unit for volume ?
Cm3 and m3
What is the instrument used to measure temperature and the SI unit for it ?
Thermometer, degrees Celsius
What does a thermometer measure ?
Temperature
What instrument is used to measure mass and its SI unit ?
Mass balance , kilograms (kg)
What does a mass balance measure?
Mass
What is the instrument that measure time and its SI unit ?
Stopwatch , seconds (s)
What does a stopwatch measure ?
Time
What is precision ?
How close something is together
What is accuracy?
How close you are to the target
