Former high school teacher here - and I'm not going back*
Personally I mostly used experiments to break up the whiteboard time, a typical 45 min. class would for me look something like this
15 min. Getting the class in order and explaining the core idea of the days lesson at the whiteboard
5 min. wake them up with a practical experiment
15 min. a small exercise where I walked around in the class and helped anyone that looked confused.
10 min. wrapping up the lesson and explaining parts that many people had trouble with.
Things burning and exploding usually went really well - titrations is much less successful (unless it explodes) for the demonstrations.
For the force and energy thing, yeah, it's better to give them a hands on feel for it, but the equations are important as well, don't forget them.
*I found out to my regret that the balance of caring about the students doing well, and being able to distance enough to not feel personally hurt when they don't, is not something I could do.
It is the mark of an educated mind to be able to entertain a thought without accepting it - Aristotle
A White Russian, shades and a bathrobe, what more can you want from life?