Theory of Machine
One end of a helical spring is fixed while the other end carries the load W which moves with simple harmonic motion. The frequency of motion is given by (where δ = Deflection of the spring)

1/2π. √(δ/g)
1/2π. √(g/δ)
2π. √(g/δ)
2π. √(δ/g)

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Theory of Machine
Which of the following statements regarding laws governing the friction between dry surfaces are correct?

The friction force is independent of me area of contact.
The friction force is directly proportional to the normal force.
The friction force is dependent on the materials of the contact surfaces.
All of these

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