13-91 | Kinetics of a Particle | Chapter 13: Cylindrical Coordinates | Engineers Academy

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Chapter 13: Kinetics of a Particle : Force and Acceleration
Equations of Motion: Cylindrical Coordniates
Hibbeler Dynamics 14th ed

13–91. Using a forked rod, a 0.5-kg smooth peg P is forced to move along the vertical slotted path r = (0.5 u) m, where u is in radians. If the angular position of the arm is u = (pi/8*t^2) rad, where t is in seconds, determine the force of the rod on the peg and the normal force of the slot on the peg at the instant t = 2 s. The peg is in contact with only one edge of the rod and slot at any instant.

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[yusufaguib]

THANKS FOR YOUR HELP ON THE LAST QUESTION, I want to ask I'm having trouble forming the free body diagrams for cylindrical coordinates questions do u have any advice on how to get better or how to spot or identify the forces?

[thabomosia]

How do you which side of the slot exert the normal force?

[uzairarshad]

Why did we take the sigh angle for Normal force, why it is not 90 minus sigh, as normal is not making sigh angle with r axis

[Frosty_Lawn]

It says that the measurements are in radians but you use degrees