MHB Max Velocity of a Pendulum Released from Rest

AI Thread Summary
The maximum velocity of a pendulum released from rest at height H is calculated using the formula v = √(2gh), assuming no air resistance. This assumption is equivalent to considering the system in a vacuum, confirming that external factors do not affect the maximum velocity. The discussion then shifts to the scenario of an elastic collision between two masses, where the final velocities are derived using conservation of momentum and kinetic energy. The equations for the final velocities are presented, but there is a query about potential simplification. Overall, the conversation focuses on the dynamics of pendulum motion and collisions in idealized conditions.
Dustinsfl
Messages
2,217
Reaction score
5
A pendulum is released from rest at a distance y = H for the y = 0.

What is the max velocity?
\[
\frac{1}{2}mv^2 = mgh\Rightarrow v = \sqrt{2gh}
\]
where I assumed there was no air resistance.

Would anything change if the system was in a vacuum?
 
Mathematics news on Phys.org
Re: pendulum

Looks right to me.

Assuming that there is no air resistance is equivalent to assuming that the system is in a vacuum.
 
Re: pendulum

Now suppose the first mass has elastic collision with a second mass hanging at equilibrium.
I have solved for the final velocities using CoM and CoKE but can it be simplifies any further is what I am wondering.
\begin{align}
v_1^f &= v_2^f - \sqrt{2gh}\\
v_2^f &= \sqrt{2gh} + v_1^f
\end{align}
 
Suppose ,instead of the usual x,y coordinate system with an I basis vector along the x -axis and a corresponding j basis vector along the y-axis we instead have a different pair of basis vectors ,call them e and f along their respective axes. I have seen that this is an important subject in maths My question is what physical applications does such a model apply to? I am asking here because I have devoted quite a lot of time in the past to understanding convectors and the dual...
Insights auto threads is broken atm, so I'm manually creating these for new Insight articles. In Dirac’s Principles of Quantum Mechanics published in 1930 he introduced a “convenient notation” he referred to as a “delta function” which he treated as a continuum analog to the discrete Kronecker delta. The Kronecker delta is simply the indexed components of the identity operator in matrix algebra Source: https://www.physicsforums.com/insights/what-exactly-is-diracs-delta-function/ by...

Similar threads

Replies
19
Views
2K
Replies
11
Views
2K
Replies
20
Views
2K
Replies
9
Views
2K
Replies
1
Views
808
Replies
1
Views
1K
Replies
12
Views
4K
Back
Top