Force!

The physics question is: How much tension is required in each scale to raise the 4 lb phone book upward until the scales are being pulled sideways with no angle?

Flexing your muscles can help keep the students in line! Notice the V-shape in the phone book and the angle of the book. The palms come up and through!

Tablecloth Trick  |  Monkey and Hunter  |  Bed of Nails  |  Centripetal Force   |  Resonance  |  Center of Mass