question_answer

A vertical sluice gate, 2.5 m wide and weighing 500 kg is held in position due to horizontal force of water on one side and associated friction force. When the water level drops down to 2 m above the bottom of the gate, the gate just starts sliding down. The coefficient of friction between the gate and the supporting structure is:

A) 0.20                             

B) 0.10

C) 0.05                             

D) 0.02

Correct Answer: B

Solution :

Area of gate at sliding, Force, on upstream of gate, Frictional force,