gears

• gears are mechanical systems that uses rotary motion to increase or decrease the speed of other gears or the direction
• gear ratios = driven teeth/driver teeth
• simple gear train

  A) driver

  B) driven

  
• the driver = input and has the motor attached to it
• driven = output gear
• speed is given in R.P.M(revelations per minute)
• the idler is used change the direction of rotation to be the same

  A) idler

  
• examples of gears

  • gears in a car
  • bicycle
  • hand whisk
• what is the gear ratio

  3:1

  
• if the gear ratio is 2:1 and the speed of the driver is 2 rpm the diver = 4 rpm