Disk moment of inertia example.

Click For Summary
SUMMARY

The discussion focuses on calculating the center of mass (c.m.) movement of a disk-shaped object under a constant force. The formula derived is x = (F/m)t^2/2, which describes the displacement of the disk's center of mass over time t. A key hint provided is to compare the acceleration of the center of mass with that of a point at the top of the disk, emphasizing the relationship between linear and rotational motion. The problem illustrates fundamental concepts in dynamics and rotational inertia.

PREREQUISITES
  • Understanding of Newton's second law of motion
  • Basic principles of rotational dynamics
  • Familiarity with the concept of center of mass
  • Knowledge of kinematic equations
NEXT STEPS
  • Study the relationship between linear acceleration and angular acceleration in rotating bodies
  • Explore the concept of moment of inertia for different shapes
  • Learn about the application of Newton's laws in rotational motion
  • Investigate how to derive kinematic equations for rotating objects
USEFUL FOR

Students of physics, mechanical engineers, and anyone interested in understanding the dynamics of rotating bodies and their motion under applied forces.

tysonk
Messages
33
Reaction score
0
A disk, cylinder shaped, of mass m and radius r is initially motionless on an ice rink. It has a massless string wound around it which you pull with a constant force F. After your hand has moved a distance d.

How far has the c.m. of the disk moved? If someone could show me how I could do this problem it would be appreciated.
 
Physics news on Phys.org
To add further I was able to solve this, but without getting rid of the parameter t. Still looking for some help...

x = (F/m)t^2/2
 
Hint: Compare the acceleration of the center of mass with the acceleration of a point at the top of the disk.
 

Similar threads

Replies
8
Views
15K
  • · Replies 40 ·
2
Replies
40
Views
6K
Replies
2
Views
4K
  • · Replies 5 ·
Replies
5
Views
2K
  • · Replies 27 ·
Replies
27
Views
6K
  • · Replies 14 ·
Replies
14
Views
5K
  • · Replies 1 ·
Replies
1
Views
2K
  • · Replies 2 ·
Replies
2
Views
2K
  • · Replies 2 ·
Replies
2
Views
5K
  • · Replies 9 ·
Replies
9
Views
7K