Hellow i'm Jonathan, i am going to tell you guys about my physic lesson activity in this blog, Anyone who needs help with their life could comment in this blog ;v... ^_^ Okay let's start...

Measurements, significant figure, and Dimension

I've learned about how to use vernier caliper, micrometer, how to count precision and uncertainty, to know the significant figures and to get the dimensions of several units. This is how,

Vernier caliper

Micrometer

Precision and uncertainty of vernier caliper

Smallest scale :1 mm

Precision         : 1/2 * 1 mm = 0.05 mm

Uncertainty     : 1/2 * 1 mm = 0.05 mm

Precision and uncertainty of micrometer screw

Smallest scale : 0.1 mm

Precision         : 1/2 * 0.1 mm = 0.005 mm

Uncertainty     : 1/2 * 0.1 mm = 0.005 mm

Significant figure 

There are three rules on determining how many significant figures are in a number:

• Non-zero digits are always significant.
• Any zeros between two significant digits are significant.
• A final zero or trailing zeros in the decimal portion ONLY are significant.

How do we know and where these dimension comes from?

We could conclude that we use the rules of indices where, e.g Velocity = Distance/time 

So, Velocity = [L] / [T] = [L] [T]-1