Frictional Torque Flywheel Question

  • Thread starter Thread starter Schoomy
  • Start date Start date
  • Tags Tags
    Flywheel Torque
Click For Summary
SUMMARY

The discussion centers on calculating the frictional torque acting on a spinning flywheel with a rotational inertia of 403.8 kg·m², which decelerates from 20.0 rad/s to zero in 256.8 seconds. The user attempted to derive the torque using various physics equations, including the relationship between angular velocity and angular acceleration. The correct approach involves calculating angular acceleration (alpha) and then applying the formula for torque (τ = I * alpha) to find the frictional torque.

PREREQUISITES
  • Understanding of rotational dynamics and torque calculations
  • Familiarity with the concepts of angular velocity and angular acceleration
  • Knowledge of the moment of inertia and its calculation
  • Basic proficiency in physics equations related to motion
NEXT STEPS
  • Study the derivation and application of the torque formula τ = I * alpha
  • Learn how to calculate angular acceleration from angular velocity changes
  • Explore the concept of moment of inertia for various shapes and its significance
  • Investigate real-world applications of flywheels in energy storage systems
USEFUL FOR

Students studying physics, particularly those focusing on rotational motion, as well as engineers and professionals involved in mechanical design and dynamics.

Schoomy
Messages
42
Reaction score
0

Homework Statement



A spinning flywheel has rotational inertia I = 403.8 kg · m2. Its angular velocity decreases from 20.0 rad/s to zero in 256.8 s due to friction. What is the frictional torque acting?

The Attempt at a Solution



I tried using Vt = r |w| and Wav = change in theta / change in time, to get r, but I'm not sure if that's right,

Then I used I = 1/2mr^2 to get mass.

Finally, I used F=ma to get Force, using the mass found above and acceleration = change in velocity (aka 20*57) / change in time.

Then I had force and radius for plugging into torque = radius*force.
 
Physics news on Phys.org
Using w = wo + alpha*t, find alpha.
Torque = I*alpha.
 

Similar threads

What is the torque exerted by the flywheel on the machine?
  • · Replies 5 ·
Replies
5
Views
4K
Angular Acceleration of a Flywheel Lab
  • · Replies 7 ·
Replies
7
Views
7K
Calculate the magnitude of torque due to friction
  • · Replies 2 ·
Replies
2
Views
3K
A cylinder connected to a hanging mass
  • · Replies 21 ·
Replies
21
Views
2K
Determine torque required to accelerate the flywheel
  • · Replies 2 ·
Replies
2
Views
4K
Net Torque Within a Mass and Pulley System
  • · Replies 22 ·
Replies
22
Views
3K
Calculate RPM given the force of a torsion spring
  • · Replies 3 ·
Replies
3
Views
2K
Solving for 'a' with Torque, Force, and Mass Moment of Inertia
  • · Replies 3 ·
Replies
3
Views
2K
Does friction torque in speeding up = speeding down?
  • · Replies 2 ·
Replies
2
Views
1K
Rotational Inertia and Net Torque with Friction
  • · Replies 10 ·
Replies
10
Views
3K