Instantaneous Center: How to Solve Homework Equations

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SUMMARY

The discussion focuses on determining the angular velocity of a gear using the instantaneous center method, with given values of linear velocities v = 9 ft/s and vc = 6 ft/s. Participants emphasized the importance of correctly applying the equation v = ω x rIC and highlighted common pitfalls, such as sign errors in calculations. The instantaneous center method is confirmed as applicable in various problems, ensuring accurate results when used correctly.

PREREQUISITES
  • Understanding of angular velocity and linear velocity concepts
  • Familiarity with the instantaneous center method in kinematics
  • Proficiency in vector cross product operations
  • Knowledge of solving equations involving angular motion
NEXT STEPS
  • Study the application of the instantaneous center method in different mechanical systems
  • Learn about vector cross product and its implications in rotational dynamics
  • Explore common errors in angular motion calculations and how to avoid them
  • Review similar triangles and their use in solving kinematic problems
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Students and professionals in mechanical engineering, physics, and kinematics who are solving problems related to angular motion and require a solid understanding of the instantaneous center method.

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Homework Statement


Determine the angular velocity of the gear at the instant shown. Set v = 9ft/s and vc = 6ft/s. Assume counterclockwise is positive.
LiUIPsu.png

Homework Equations


v = w x rIC

The Attempt at a Solution


I tried solving this many times using va = v0 + (ω x ra0 ) and vb=v0 + (ω x rb0 ) but kept getting the wrong answer.
Then I ended up solving for the instantaneous center using similar triangles and used v = ωxrIC.

How do I know when to use an instantaneous center in my problem solving?
 
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Nikstykal said:
I tried solving this many times using va = v0 + (ω x ra0 ) and vb=v0 + (ω x rb0 ) but kept getting the wrong answer.
Then the problem is somewhere in the steps you did not show.
Just a guess: Did you take the signs into account properly?
 
Nikstykal said:

Homework Statement


Determine the angular velocity of the gear at the instant shown. Set v = 9ft/s and vc = 6ft/s. Assume counterclockwise is positive.
LiUIPsu.png

Homework Equations


v = w x rIC

The Attempt at a Solution


I tried solving this many times using va = v0 + (ω x ra0 ) and vb=v0 + (ω x rb0 ) but kept getting the wrong answer.
Then I ended up solving for the instantaneous center using similar triangles and used v = ωxrIC.

How do I know when to use an instantaneous center in my problem solving?
Instantaneous centre method can be used in any problem.
But both methods give the same result. Maybe there's some problem with the signs like mfb said.
 
Thank you for helping! Sorry there was such a delay in my response. Yes it ended up being just a calculation error when mixing up the signs!
 

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