Lesson - 1.1.1 and 1.1.2
Measuring Length & Volume
Rulers can be used to measure small distances of a few centimetres (cm).
They are able to measure to the nearest millimetre (mm)
When measuring larger distances (of a few metres) a tape measure is more appropriate or, when measuring even larger distances, a trundle wheel
These are tools used to measure big areas and length like kilometre
Source :
Measuring cylinders can be used to measure the volume of liquids
By measuring the change in volume, a measuring cylinder can also be used to find the volume of an irregular shape
Scaler
Scalars are quantities that have only a magnitude
For example, mass is a scalar since it is a quantity that has magnitude without a direction
Distance is also a scalar since it only contains a magnitude, not a direction
Vector
Vectors have both magnitude and direction
Velocity, for instance, is a vector since it is described with both a magnitude and a direction
When describing the velocity of a car it is necessary to mention both its speed and the direction in which it is travelling
For example, the velocity might be 60 km per hour (magnitude) due west (direction)
Distance is a value describing only how long an object is or how far it is between two points - this means it is a scalar quantity
Displacement on the other hand also describes the direction in which the distance is measured - this means it is a vector quantity
For example, a displacement might be 100 km north
Example Of Scaler And Vector
Some vectors and scalars are similar to each other
For example, the scalar quantity distance corresponds to the vector quantity displacement
Corresponding vectors and their scalar counterparts are aligned in the table where applicable