Now might be a good time to refer readers to the classic post exhorting the masses to DO PHYSICS on the first day of school. In AP/honors, I start with forces, free body diagrams, and equilibrium; in general physics, I begin with motion graphs. In all cases I have live, quantitative demonstrations, which start within 15 minutes of the opening bell.
The "First Day of School: Do Physics" post is linked here for your reference. Enjoy!