Energy question, what are the quantities conserved?

  • Thread starter Thread starter Clara Chung
  • Start date Start date
  • Tags Tags
    Energy quantities
AI Thread Summary
The discussion centers on identifying conserved quantities in a physics problem involving a particle influenced by forces. The participant expresses uncertainty about the conservation of momentum and angular momentum due to the presence of force and torque acting on the particle. They conclude that energy is conserved along both the x and y axes, which helps them progress towards solving the problem. The equations of motion for the particle suggest that while momentum may not be conserved, energy conservation can still apply. Overall, the focus is on understanding the conservation laws relevant to the motion of the particle.
Clara Chung
Messages
300
Reaction score
13

Homework Statement


15.png


Homework Equations

The Attempt at a Solution


I don't know how to do the last part. What are the additional conservation laws? I don't think momentum is conserved because there is force acting on the particle. I don't think angular momentum is conserved too because there is a torque acting on the particle.
Here is the numerical answer:
16.png
 

Attachments

  • 15.png
    15.png
    83.5 KB · Views: 721
  • 16.png
    16.png
    10.1 KB · Views: 446
Physics news on Phys.org
Note that the equation for ##\ddot x## involves only ##x## (not ##y##). Similar comment for ##\ddot y##.

Imagine the x equation described a particle moving only along the x-axis. Anything conserved in this x-motion?
 
  • Like
Likes Clara Chung
TSny said:
Note that the equation for ##\ddot x## involves only ##x## (not ##y##). Similar comment for ##\ddot y##.

Imagine the x equation described a particle moving only along the x-axis. Anything conserved in this x-motion?
Thank you, I think the energy along x and y-axis are conserved too. Then I can find the answer.
 
Thread 'Collision of a bullet on a rod-string system: query'

Thread 'Collision of a bullet on a rod-string system: query'

In this question, I have a question. I am NOT trying to solve it, but it is just a conceptual question. Consider the point on the rod, which connects the string and the rod. My question: just before and after the collision, is ANGULAR momentum CONSERVED about this point? Lets call the point which connects the string and rod as P. Why am I asking this? : it is clear from the scenario that the point of concern, which connects the string and the rod, moves in a circular path due to the string...
View full post »

Similar threads

Is Linear Momentum Conserved in This Case? (sliding box hits a floor tile)
Replies
2
Views
846
Angular momentum for a bullet and a rod attached to a ceiling
Replies
17
Views
1K
Using conservation of energy and momentum in projectile motion
Replies
18
Views
1K
Spring momentum conservation problem
Replies
4
Views
2K
Conservation of Mechanical Energy - Which Equation To Use?
Replies
9
Views
1K
What Causes the Loss of Mechanical Energy in a Frictionless Spinning Cylinder?
Replies
6
Views
1K
Conservation of momentum and mechanical energy on an inclined plane
Replies
19
Views
2K
Conservation of Momentum Problem - Mechanical and Kinetic Energies
Replies
2
Views
891
Angular momentum conservation on a merry-go-round
Replies
5
Views
2K
Minimum angular velocity of a point mass on a rotating rod
Replies
5
Views
606

Hot Threads

Recent Insights

Back
Top