^Death well & Rotor
^Death well & Rotor
Static friction balances the weight of person & normal reaction 
(due to centrifugal force) provides the necessary centripetal force i.e. f = mg

Using f = μs N, condition for

^Death well & Rotor
Static friction balances the weight of person & normal reaction 
(due to centrifugal force) provides the necessary centripetal force i.e. f = mg

Using f = μs N, condition for
