Kinematics Problem Solving - Physics Solutions

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SUMMARY

The discussion focuses on solving a kinematics problem involving a pendulum and its maximum angle, θmax, in a dynamic scenario. The equilibrium angle is established as θ = π/4, with the condition for maximum θ occurring when the pendulum and slider share the same acceleration, a = g. The participants emphasize the importance of using polar coordinates for analyzing the kinematics, despite the final projection into radial and angular components being the primary concern. The conversation highlights the need for precise equations to describe the pendulum's motion effectively.

PREREQUISITES
  • Understanding of kinematics principles, particularly in dynamic systems.
  • Familiarity with polar coordinate systems and their applications in physics.
  • Knowledge of pendulum motion and equilibrium conditions.
  • Ability to derive and manipulate equations of motion for oscillatory systems.
NEXT STEPS
  • Study the derivation of equations for pendulum motion using polar coordinates.
  • Explore the concept of maximum angle in dynamic systems and its implications.
  • Learn about the conditions for equilibrium in oscillatory motion.
  • Investigate the relationship between acceleration and angular displacement in pendulum systems.
USEFUL FOR

Physics students, educators, and anyone interested in advanced kinematics problem-solving, particularly in the context of pendulum dynamics and equilibrium analysis.

ramadhankd
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Homework Statement
The homework statement/question is in my post.
Relevant Equations
So does the equations and attempted solutions. I just wanna ask whether or not my solution is correct, because the question has a triangle symbol on It, and It supposed to be complex. Solving It that easily gives me anxiety. Please kindly help.
Thanks.
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Seems to me you describe some equilibrium situation. What would ##\theta(t)## look like ?

[edit] And I don't see when ##a=g## would normally ever happen (unless the wire breaks :biggrin: ).
 
It's actually a dynamic question. The question is on the top left in my post (problem 3/92). We need to find the value of maximum theta. In my opinion, this condition will be reached when the pendulum have no relative motion with the slider, thus having the same acceleration a = g. I just wonder if this condition I set for max theta is right. Also, I use polar coordinate approach to analyze the kinematics while in the end, It doesn't matter at all because I only need to project a into r and theta component of acceleration (the value of r, and other defining properties of a polar system doesn't matter). Is this right?
 
I should have read the small print ...

So the equilibrium ##\theta## is ##\pi/4## and the pendulum swings around that angle. Any way to describe the motion ? With the initial condition ##\theta = 0## the answer seems easy.

I think your condition for ##\theta_\text{max}## is correct - but it leads to two solutions.
 
For the motion description, I think that the motion is that the pendulum has the constant acceleration a when θ=θmax. As for the two solutions, what are those? I'm sorry for the late reply, I've been out this weekend.
 
You don't list any equations to determine the motion. 'I think' doesn't help.
 

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