# pendulum

1. ### Compound pendulum

a compound pendulum is formed by suspending a heavy ring from a point on its circumference . determine the time period of oscillation of radius of the ring is 1m. Time period T =2π √I/mgl I took I= mR^2/2 and l=r which gave me an answer of 1.41s . But the actual answer is 1.28s what am I...
2. ### Rotational Power = torque (τ)*(ω) angular velocity? - Problem with units

I set up an experiment with a pendulum (uniform beam) swinging on a hinge and the hinge attached to a small PMDC generator. The generator had no load attached and its output voltage is proportional to its speed of rotation. I swung the pendulum from 90 degrees and using a data logger I...
3. ### What are the collision forces applied to the stops in a moving triple pendulum?

Hello, it's been a while since I did not use lagrangian mechanics and all this stuff and would bet it's needed for my purpose. Introduction : if I take a simple pendulum and make it collide on its origin with a stop, how much will suffer the stop ? Knowing that the pendulum is subject to an...
4. ### pendulum question

Hi guys, A bullet of mass 25 grams and travelling horizontally at a speed of 200 m/s imbeds itself in a wooden block of mass 5kg suspended from a chord 3 m long. How far will the block swing from its position of rest before beginning to return. so, the bullet has a momentum = mv = 0.025...
5. ### Flywheel Inverted pendulum torque calculation

I started building my own flywheel inverted pendulum (i'm using a standard PID controller for the balancing). I came across many articles regarding the differential equation of the pendulum. Most article develop the motion equation using the Euler–Lagrange, few chose the Newtonian way. What I...
6. ### Pendulum Pivot Max Force Calc

Hey Guys, I recently built a Reverse Hyper, picture attached, for my home gym. It's a basic pendulum on which weight is added. It currently utilizes 2 - 5/8'' pillow block bearings for the pivot. Each are rated to ~6.25 KN. Can anyone provide me with the equations or reference material...
7. ### Pendulum Pivot Max Force Calc

Hey Peeps, I recently built a Reverse Hyper, picture attached, for my home gym. It's a basic pendulum on which weight is added. It currently utilizes 2 - 5/8'' pillow block bearings for the pivot. Each are rated to ~6.25 KN. Can anyone provide me with the equations or reference material...
8. ### Pendulum Problem

A simple pendulum has a period of 3 seconds on Earth. If it is taken to Planet X, which has the same mass as Earth but a radius of 0.5 the size of Earth's radius, the new period will be what? I am using T^2/r^3 = Constant to solve for T(x) but I don't think I'm getting the correct answer...
9. ### I need help with a Rigid Pendulum Calculation please

I have a rigid body pendulum that is used to strike an object at the bottom of its swing. Ultimately I would like to know how much forced is the object being struck with. Could I do this with just knowing the velocity of the weight? I was thinking then I could get P=MV. Can someone please help e...
10. ### Pendulum impact force

Hi, I'm trying to figure out the impact force of a pendulum at its max speed. My take on this is to use 2 equations: Everything here is known except the velocity v Potential/Kinetic energy m*g*h=1/2*m*v^2 which for a pendulum can be written v=sqrt(2*g*L*(1-cos(theta)) Impact force F=m*Delta...
11. ### I need someone hel pto clarify my problem

Question: A student used a digital stopwatch three time 10 oscillations of a pendulum. The timings were 13.52s, 13.64s and 13.58s a) Calculate i the average time for 10 oscillations, ii the time period of the oscillations. b) Estimate the accuracy of the timings, giving a reason for your...
12. ### Compound pendulum Experiment

Hello I am trying to work out the acceleration due to gravity using compound pendulum method. However I am totally stumped and don't understand how you find it using this method,I am able to carry out the experiment properly. I am just confused about how you use the graph to find the value of...
13. ### Help with free body diagram for a pendulum

I wrote the summation of forces perpendicular to the inverted pendulum and the summation of the moments about the centroid of the pendulum. I am not sure if they are right (especially the signs) and was wondering if someone could check
14. ### Length of the pendulum which has the same period?

can anyone show me how to get the ans ? i couldnt understand the question. your help is much appreciated!
15. ### Kinetic energy (spehrical pendulum)

This is not a homework problem. I am refreshing on Analytical mechanics. Question: Consider the spherical pendulum, which consists of a mass m suspended by a string from the ceiling. The mass is free to swing in both directions but maintains a constant distance from the point of suspension...
16. ### Inverted pendulum

Hi, I'm not sure this is the correct place for this. I am taking my first Physics course in about 40 years, Computational Physics with the Garcia textbook, "Numerical Methods for Physics". Problem 21 attached deals with an inverted pendulum. I have included a scan of the problem and my...
17. ### Pendulum problem

Mass m=1kg is hung to a string (not elastic). The pendulum begins to oscillate angular amplitude alfa=pi/3 and period T=pi/sqrt(2) s. a) Calculate the maximum magnitude of the velocity of the mass while it is oscillating b)The limits within the tension in the spring varies during the...
18. ### Two-ish problems(1 pendulum and 1 force problem)

So, I have a test tomorrow, and I just need help with these two problems. I honestly don't know what to do, although, I'm sure if I had the equations I could figure it out. I know the answers for everything so I can check it that way. 1) A 5N force acts on a 2kg object moving with a speed of...
19. ### Simple pendulum problems

1. Why both L of left hand and right hand figures are different? 2. Why mg is put on the right end, not middle of the bar, in the right hand figure?
20. ### Pendulum and Pin issue

Hello, everyone! I've been given an issue from my colleagues, and I need some help. It's about a particle attached to a string and a particle with a "d" distance underneath the place where the article is attached. My question is, how should I start solving this issue? Is it really an energy...