The motion and power transmitted by gear is kinematically equivalent to that transmitted by friction wheel.

  Consider two circular wheels A & B mounted on two parallel shafts and the wheels are pressed  against each other. Shafts are mounted on anti-friction bearings.

  When wheel A is rotated by shaft, it will rotate wheel B in opposite direction.

Gear

Force on the system:-

1.RN= Normal reaction between two rubbing wheels

  (Separation force)

2.T=    Tangential force

3.F=     Frictional Force (F= µRN),

  where µ= co-efficient of friction

When T≤ µRN  wheel B will rotated by wheel A

When T> µRN slippage will take place

 

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