13-84 | Kinetics of a Particle | Chapter 13: Hibbeler Dynamics 14th | Engineers Academy

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Chapter 13: Kinetics of a Particle : Force and Acceleration
Equations of Motion: Normal and Tangential Coordinates
Hibbeler Dynamics 14th ed

*13–84. The 2-lb block is released from rest at A and slides down along the smooth cylindrical surface. If the attached spring has a stiffness k = 2 lb/ft, determine its unstretched length so that it does not allow the block to leave the surface until u = 60.

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Great video as always! I made an assumption that the Fs >= Wcostheta (since that would mean that the block would leave the surface) and got the same answer!

Clipaholick
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what about the normal force? do we consider it zero since at 60º the block leaves the surface?

moosman