1/15sec, ISO 25 
1/25sec, ISO25 
1/100sec, ISO64 
1/500sec ISO500 
1/2000sec ISO2000
The brightness of these images is very low because there is no sunlight in my room. I tried to get close to the window, but the brightness was still low. In the process, I changed shutter speed and ISO to make the picture look clear.
Despite working with low light, your examples clearly show the difference between a faster shutter speed that can freeze motion and a longer one that blurs motion.