Safety in practical lessons using heavy or fine items or projectiles

Large masses should not be suspended without suitable safeguards and warning. Broken toes or fingers may result!
Fine thread or wire should not be strung across pathways without card being hung on it to make others aware it is there, or a barrier of stools with a warning sign used to make others realize that there is danger (Young Modulus experiment!)
Masses 'bouncing' on springs, or pendula can take someone’s eye out! Goggles should be worn.
Projectiles sometimes go where they are not expected to! Goggles should be worn!

Extracted from WGHS Physiscs Department hHandbook written by L.O. Jones 2005