How to use space as field separator using awk?

Hereby I tried to output the column along with field separator.

But it fails in my case.

awk.txt(Input file)

Sr No Name Sub Marks
1) Amit Physics 80
2) Rahul Maths 90
3) Shyam Biology 87
4) Kedar English 85
5) Hari History 89

awk command which I tried as follows:-

 awk -F ' ' '{print $2 $3;}' awk.txt > output.txt

Obtained Output:

NoName
AmitPhysics
RahulMaths
ShyamBiology
KedarEnglish
HariHistory

Expected output:

    Name Sub 
    Amit Physics 
    Rahul Maths 
    Shyam Biology 
    Kedar English 
    Hari History