Levers and gears

• Levers reduce the force needed to get the same moment
• Levers push one end down of a lever, and rotation around the pivot causes the other end to rise. This is the turning effect of a force.
• Gears have circular clogs with 'teeth' around the edges

  
• Interlocked gears will rotate at different speeds, depending on the size. The larger the gear, the slower it spins.
• Teeth interlock with each other, causing both to turn as they're linked.
• A force applied to a small gear creates a small moment