Measurement and Dimension

 Measurement usually used when we want to measure something ex: we want to calculate the Velocity of an object we can use Distance traveled.

                                                         Time taken

In measurement we know [M] ,[L],[T] this three is the basic Dimension

[M] stand for mass [L] stand for length and [T] stand for time

 we can input this three Dimension to a formula example velocity formula:

Distance/Time taken so distance means [L] and time mean [T] so we can say [M].[T]-1/ [M]/[T]

Measurement need to be learned because we know the Si for every units then we can input to the [M],[T],[L] quantity

In measurement we also learn how to use Vernier caliper 

This is the way to use Vernier Caliper

Vernier caliper is used to measure an object that's realy tiny Ex: pencil diameters, Coin, etc.

This is an example  of a measurement question

1. If an object has the shape of cube with 5cm long and have the mass of 15 kg what is the Density and the dimension of the object

Answer: Because density formula is m/V so we can make 5x5x5=1.25M so 15/1.25 =12 Kg/M3

and the dimension is [M].[L]-3 because kg / m3 so we add -3 because its kg divided by m3.

 

Significanat figure

- All non-zero digits are considered significant

- Zeros appearing anywhere between two non-zero digits are significant

- All numbers in scientific notatran are significant figure

Ex: 0,628 have 3 SF   x    2,2 have 2 sf = 1,35226 have more than 2 sf so we round off it become 1,4 so it have 2 sf