★★★★

  A+0+35 A ball swung on a string held by a sleeve.
  A+5+20 Bowling ball pendulum swings back to nose.
  A+12+0 Blocks, with various surfaces slide on an inclined plane.
  A+14+0 Weight on a vertical spring with markers on stand.
  A+25+0 Two disks, one weighted in center and other on rim, roll down ramp.
  A+30+15 Rotating chair with dumbbells or weighted bicycle wheel.
  A+35+10 Elastic collisions: Five hanging balls and two unequal hanging balls.
  A+35+20 Three meter airtrack with gliders that rebound elastically, or stick.
  A+50+0 Dropped and shot balls hit bench simultaneously.
  A+50+10 The Hunter
  A+50+35 Ballistics car: Ball ejected from rolling car drops back in.
  A+55+5 Rolling spool: String on spool is pulled at various angles.
  B+10+0 Mass on a spring.
  D+0+28 Energy storage in a commercial capacitor. Loud bang!
  D+10+6 Attraction and repulsion of charged styrofoam balls.
  D+10+12 Charge resides on the outside of a conductor.
  D+35+1 Inverter Magnet