Understanding Rotational Acceleration and the Role of Normal Force

  • Context: Undergrad 
  • Thread starter Thread starter goldfish9776
  • Start date Start date
  • Tags Tags
    Axis Rotation
Click For Summary
SUMMARY

The discussion focuses on the concept of rotational acceleration and the role of normal force (Fn) in calculating moments of inertia. It clarifies that the moment of inertia (IG) is calculated about an axis perpendicular to the page, primarily considering the tangential force (Ft) without including the normal force. The normal force influences rotational accelerations around axes that lie within the plane of the page, but does not contribute to the total moment about the axis coming out of the page. This distinction is crucial for understanding how different forces affect rotational dynamics.

PREREQUISITES
  • Understanding of moment of inertia and its calculation
  • Familiarity with tangential and normal forces in rotational dynamics
  • Knowledge of rotational acceleration concepts
  • Basic principles of mechanics and dynamics
NEXT STEPS
  • Study the effects of normal force on rotational acceleration in different axes
  • Learn about the calculation of moment of inertia for various shapes and axes
  • Explore the relationship between tangential force and rotational motion
  • Investigate advanced topics in rotational dynamics, such as torque and angular momentum
USEFUL FOR

Students and professionals in physics, mechanical engineering, and anyone interested in the principles of rotational dynamics and mechanics.

goldfish9776
Messages
310
Reaction score
1
in this notes , the author gave that the IG is the moment of inertia calculated about an axis which is perpendicular to the page ...

moment of inertia calculated about an axis which is perpendicular to the page here means id due to Ft(tangential force) only ? not include Fn ( normal force ) ? So , for the sum of moment about O , it's involve only moment due to Ft only ? Not include Fn ? Why ? can you explain ?
4BArsOH.png
 
Physics news on Phys.org
That is for the rotational acceleration around the axis coming out or the page. The normal force will have an effect on rotational accelerations around other axes which are on the plane of the page.
 
FactChecker said:
That is for the rotational acceleration around the axis coming out or the page. The normal force will have an effect on rotational accelerations around other axes which are on the plane of the page.
So the total moment about M is considering only the rotational acceleration about the axis which is outside of the page(tangential acceleration)?
Why the total moment about O doesn't include the normal acceleration?
 

Similar threads

Undergrad Moment of Inertia about an axis and Torque about a point
  • · Replies 5 ·
Replies
5
Views
3K
Undergrad How to quantify gyroscopic precession torque?
  • · Replies 49 ·
2
Replies
49
Views
5K
Undergrad Intuition Behind Intermediate Axis Theorem in an Ideal Setting
  • · Replies 6 ·
Replies
6
Views
2K
Graduate Rotating Sphere: Conceptual Question
  • · Replies 10 ·
Replies
10
Views
3K
Undergrad Is it possible to create linear acceleration using nothing but different moments of inertia beteen a wheel and axle?
  • · Replies 5 ·
Replies
5
Views
2K
Undergrad Finding the Axis of Rotation with Given CoG and Force Point
  • · Replies 32 ·
2
Replies
32
Views
3K
Undergrad Non-Constant Angular Acceleration
  • · Replies 6 ·
Replies
6
Views
3K
Undergrad A rod that falls while rotating from the end of a table
  • · Replies 2 ·
Replies
2
Views
2K
Undergrad Intermediate Axis Theorem - Intuitive Explanation
  • · Replies 9 ·
Replies
9
Views
6K
Undergrad I'm calculating more energy out than I put in
  • · Replies 138 ·
5
Replies
138
Views
9K