K.E. and P.E. in a Pendulum and Spring

  • Thread starter Thread starter Haseeb Ali
  • Start date Start date
  • Tags Tags
    Pendulum Spring
AI Thread Summary
The discussion focuses on the interconversion of kinetic energy (K.E.) and potential energy (P.E.) in a pendulum and spring system. In a pendulum, at maximum deflection, the bob possesses maximum potential energy (PEmax), while kinetic energy is zero. As the pendulum swings, potential energy decreases while kinetic energy increases, maintaining the conservation of energy principle. The potential energy at any angle of deflection can be calculated using basic trigonometry, leading to the equation K.E. = PEmax - PE(theta). The conversation emphasizes the importance of individual effort in understanding these concepts.
Haseeb Ali
Messages
6
Reaction score
0
Can anyone explain the conversion of K.E and P.E during compression and expansion of spring and during the motion of pendulum ?
 
Physics news on Phys.org
Start with the pendulum. Which bit don't you understand? Do you know what PE and KE are?
 
CWatters said:
Start with the pendulum. Which bit don't you understand? Do you know what PE and KE are?
Yes .. i know that. I just want you to explain the interconversion of K.E and P.E as pendulum moves to and fro ,
 
We're not going to do that. We require our members to put more effort than that into their own learning.
 
  • Like
Likes Haseeb Ali
At maximum deflection the bob has maximum Potential Energy. Call that PEmax.

Using Basic trig. you can calculate the bob height and hence the PE at any angle of deflection. Let's call that PE(theta) where theta is the instantaneous angle of deflection.

Then applying conservation of energy...

PE(theta) + KE(theta) = PEmax
or rearrange that to give
KE(theta) = PEmax - PE(theta)

Edit: Sorry russ_watters is right. That's why I haven't calculated PE(theta) for you.
 
  • Like
Likes Haseeb Ali

Thread '1:1 versus 2:1 Mechanical Advantage debate'

The rope is tied into the person (the load of 200 pounds) and the rope goes up from the person to a fixed pulley and back down to his hands. He hauls the rope to suspend himself in the air. What is the mechanical advantage of the system? The person will indeed only have to lift half of his body weight (roughly 100 pounds) because he now lessened the load by that same amount. This APPEARS to be a 2:1 because he can hold himself with half the force, but my question is: is that mechanical...
View full post »

Thread 'Newton's first law?'

Some physics textbook writer told me that Newton's first law applies only on bodies that feel no interactions at all. He said that if a body is on rest or moves in constant velocity, there is no external force acting on it. But I have heard another form of the law that says the net force acting on a body must be zero. This means there is interactions involved after all. So which one is correct?
View full post »
Thread 'Beam on an inclined plane'

Thread 'Beam on an inclined plane'

Hello! I have a question regarding a beam on an inclined plane. I was considering a beam resting on two supports attached to an inclined plane. I was almost sure that the lower support must be more loaded. My imagination about this problem is shown in the picture below. Here is how I wrote the condition of equilibrium forces: $$ \begin{cases} F_{g\parallel}=F_{t1}+F_{t2}, \\ F_{g\perp}=F_{r1}+F_{r2} \end{cases}. $$ On the other hand...
View full post »

Similar threads

B E.P.E. -> ? when 2 masses are attached to a spring
Replies
2
Views
1K
Question about Lagrangian density
Replies
1
Views
1K
Resonance between spring and pendulum: Different frequencies
Replies
4
Views
3K
I Solving for the Motion of a Spring Pendulum
2
Replies
76
Views
6K
A rocket on a spring, related to potential/kinetic energy
Replies
3
Views
2K
A Modeling the damping of a physical rigid pendulum
Replies
1
Views
2K
A cart collides with a bumper -- Find the final displacements, etc.
Replies
15
Views
2K
B Energy Band Diagram: K.E. & P.E. of Electron in Semiconductor
Replies
5
Views
2K
Calculating the Energy Absorbed by a Spring in a Car Suspension System
Replies
5
Views
2K
B Why in two block systems do both blocks tend to have the same velocity?
Replies
6
Views
1K

Hot Threads

Recent Insights

Back
Top