JEE Main 2016 Physics question
In an engine the piston undergoes vertical simple harmonic motion with amplitude 7cm. A washer rests on top of the piston and moves with it. The motor speed is slowly increased. The frequency of the piston at which the washer no longer stays in contact with the piston, is close to :
Answer: (2)
Solution
At the **highest** point of the motion the acceleration points downward with magnitude . The forces on the washer there are its weight downward and the normal reaction upward, so
mg - N = mω^2A.
Contact is lost when falls to zero,
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