A very long uniform helix is made of thin metal wire. The axis of helix is vertical. A small bead begins to slide down the fixed helix starting from rest. Considering friction between bead and wire of helix to be non-zero, which of the following statements is/ are true as long as bead moves on helix.
This question has multiple correct options
The speed of bead keeps on increasing.
The magnitude of frictional force on bead remains constant.
The speed of bead first increases and then remains constant.
The magnitude of frictional force increases and then remains constant.
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Correct options are C) and D)
hint: first draw FBD of system and then applied Newton second law