Inelastic collision angular acceleration problem

Click For Summary

Homework Help Overview

The discussion revolves around an inelastic collision problem involving a lump of clay and a door, focusing on the calculation of angular acceleration after the collision. Participants are exploring the principles of angular momentum and inertia in the context of rotational motion.

Discussion Character

  • Exploratory, Assumption checking, Problem interpretation

Approaches and Questions Raised

  • Participants are discussing the calculation of angular acceleration and questioning the clarity of the problem statement regarding whether it is asking for angular acceleration or angular velocity after the collision. There are attempts to relate the inertia of the door and the clay, and to apply principles of angular momentum.

Discussion Status

Some participants have provided guidance on considering the forces acting on the door and the torque created during the collision. There is an ongoing exploration of the problem's requirements, with no explicit consensus reached on the interpretation of the tasks.

Contextual Notes

Participants note that task a) was successfully completed regarding inertia, while task c) involves calculating the remaining kinetic energy after the collision. There is uncertainty about the specific request for angular acceleration versus angular velocity in task b).

llisle39
Messages
4
Reaction score
0
Having problem with task b). Any suggestions?




 

Attachments

  • fysikkforum.JPG
    fysikkforum.JPG
    31.5 KB · Views: 565
Physics news on Phys.org
Show what you've done so far and where you are stuck. What physics principles or equations do you think might be relevant here?
 
1. A door gets hit by a lump of clay with mass m=0.50 kg. The lump of clay has a velocity of v=10 m/s and hits the outer edge of the door at a right angle lodging itself in the door (See picture)
In task a) we used the formula (I=1/3*M*r^2) and calculated the inertia being 7 kgm^2/s.
In task b) we are looking for the angular acceleration. So far we have found the angular velocity (w) but are having difficulties finding the angular acceleration (alpha) We tried to combine the inertia for the door and the lump of clay. And we have tried to use the formula for angular momentum saying that La = Lb
 
I don't see how you can determine the angular acceleration of the door during the collision with the data given, if that's what they are asking. After the collision should be easy though: What forces act on the door creating a torque?

Perhaps they meant to ask for the angular velocity after the collision, not the acceleration?

Tell me what parts a and c ask for.
 
We are looking for the angular acceleration after the collision. Task a asks for the inertia. This was no problem. Task c asks for the remaining kinetic energy after the collision :-)
 
llisle39 said:
We are looking for the angular acceleration after the collision. Task a asks for the inertia. This was no problem. Task c asks for the remaining kinetic energy after the collision :-)
Angular acceleration is the rate at which the angular velocity changes. I strongly suspect that they meant to ask for the angular velocity of the door after the collision, not the acceleration.
 

Similar threads

  • · Replies 47 ·
2
Replies
47
Views
4K
Replies
9
Views
3K
  • · Replies 71 ·
3
Replies
71
Views
5K
  • · Replies 18 ·
Replies
18
Views
2K
  • · Replies 4 ·
Replies
4
Views
1K
  • · Replies 11 ·
Replies
11
Views
3K
  • · Replies 6 ·
Replies
6
Views
2K
Replies
10
Views
3K
  • · Replies 2 ·
Replies
2
Views
3K
Replies
335
Views
17K