Physics is fun

My best friend Erik was here again. This time with his wife and youngest son.
We focussed not on walking in nature like the time before. We had more  a cosy walk in the city for an ice-cream, visiting the wonderful botanical gardens from Lund, a walk along the coast in Bjärred and of course stopping at every playground for the little son.

As a scientist Erik likes to prove physical laws. Or is the experimenting mode that have real boys in them?

Here you can see him accelerating on a marry-go-round just by moving his weight from the side to the middle or decelerating by moving his weight again from the middle to the side. 

Or how physics can be fun.