Vertical energy of a pendulum - is there one?

AI Thread Summary
The discussion centers on the concept of vertical kinetic energy in the context of a simple pendulum. The original poster questions whether vertical kinetic energy exists as a separate entity or if it is merely a component of total kinetic energy. Responses clarify that while the pendulum's velocity can be broken down into vertical and horizontal components, kinetic energy itself is a scalar quantity that encompasses the entire velocity vector. Ultimately, the distinction between vertical kinetic energy and total kinetic energy is acknowledged, but it is emphasized that kinetic energy does not have direction. The conversation concludes with a clear understanding that kinetic energy is defined by the total velocity, not its components.
jojotank
Messages
13
Reaction score
0

Homework Statement


Hello. I was just wondering. You have a simple pendulum . string and a ball with mass at the end. We usually solve examples and we think about conversation of kinetic energy and potentional energy. I was just wandering if there is also something like vertical kinetic energy. Or it is just a part of kinetic energy itself (just the sine part of velocity vector). If it exist, i know it is very small. I was just wondering... Thank you.

Homework Equations


no need for them

The Attempt at a Solution


thinking
 
Physics news on Phys.org
Not quite sure what you mean. You can certainly express the velocity of the pendulum in terms of vertical and horizontal components, but the kinetic energy uses the full velocity. Velocity has a direction, but kinetic energy does not.
 
It is totaly clear now. Thank you.
 
Thread 'Voltmeter readings for this circuit with switches'
TL;DR Summary: I would like to know the voltmeter readings on the two resistors separately in the picture in the following cases , When one of the keys is closed When both of them are opened (Knowing that the battery has negligible internal resistance) My thoughts for the first case , one of them must be 12 volt while the other is 0 The second case we'll I think both voltmeter readings should be 12 volt since they are both parallel to the battery and they involve the key within what the...
Thread 'Trying to understand the logic behind adding vectors with an angle between them'
My initial calculation was to subtract V1 from V2 to show that from the perspective of the second aircraft the first one is -300km/h. So i checked with ChatGPT and it said I cant just subtract them because I have an angle between them. So I dont understand the reasoning of it. Like why should a velocity be dependent on an angle? I was thinking about how it would look like if the planes where parallel to each other, and then how it look like if one is turning away and I dont see it. Since...
Back
Top