Calculating Acceleration of a Flywheel: Tangential, Radial, and Resultant

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SUMMARY

The discussion focuses on calculating the tangential acceleration, radial acceleration, and resultant acceleration of a flywheel with a radius of 0.300 meters and a constant angular acceleration of 0.600 rad/s². Participants clarify the formulas needed, specifically noting that radial acceleration (a_rad) is calculated using the formula a_rad = ω²/r. The conversation emphasizes the importance of clearly defining the problem, including initial conditions such as angular displacement and time, to arrive at accurate results.

PREREQUISITES
  • Understanding of angular kinematics, specifically angular acceleration.
  • Familiarity with the formulas for tangential and radial acceleration.
  • Knowledge of basic trigonometry, particularly in relation to angular measurements.
  • Ability to manipulate equations involving angular displacement and velocity.
NEXT STEPS
  • Learn how to derive tangential acceleration from angular acceleration using the formula a_tan = α * r.
  • Study the relationship between angular velocity and linear speed at the circumference of a rotating object.
  • Explore the concept of angular displacement and its impact on rotational motion calculations.
  • Investigate the units of angular acceleration and how they relate to linear acceleration in rotational dynamics.
USEFUL FOR

This discussion is beneficial for physics students, mechanical engineers, and anyone involved in rotational dynamics or flywheel design and analysis.

bigtymer8700
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A flywheel with a radius of 0.300 starts from rest and accelerates with a constant angular acceleration of 0.600/s^2. i know how to solve for the atan but not for arad which is arad=w^2/r it ask Compute the magnitude of the tangential acceleration, the radial acceleration, and the resultant acceleration of a point on its rim at the start.


i know its 2pi=6.28rad all the way around and its acc. at .600rad/s^2 but i don't know where to go from there
 
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Your problem is not clearly formulated. Write clearly what is to be found out. Show your attempt.
 
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it says at the start so would thetaf and thetai be both 0?
 
That means final theta = 2*pi.

w^2 = 0^2 + 2*a*(2pi). So, you know final w(omega).

Now find the linear speed, at the circumference.
 
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so that means w^2=0^2 +2(.600)(6.283) it comes out to be w=2.86 but it says its wrong
 
As I said previously, your problem was not clearly formulated. How much time or what is the total angle?
 
well if you use the w^2=Wo+2a(O-0o) its asking for the speed of the tip of the flywheel from the start so wouldn't the theta be 2xpi or just pi?
 
i agree with shooting star.. how long was it spun or what was its angular displacement?
 
and are u solving for the angular velocity or angular acceleration

By the way.. can u please explain what the units of atan and arad should be? it matters...
are atan and a rad angular acceleration or linear?
 
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  • #10
thats really where I am stuck on i solved the other parts of the problem asking for the atan arad at 60degrees and 120degrees but what value would i use for the start theta? 360 or 180, 0?
 
  • #11
well it starts at 0... (rest), also answer my previous post.. because that's essential... and while you are at it.. write down the problem exactly verbatim. and your attempt :D
 
  • #12
nvm yea you just use 0 for the start thanks guys
 
  • #13
ok lol..
 
  • #14
Hey bigtymer8700, you didn't put the D in the right place in your first post! Glad that you've understood.
 

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