What is Spring: Definition and 999 Discussions

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includes extensive documentation, tutorials and examples. More than 70,000 users from 60 countries have downloaded the software, as of January 2007.

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  1. Santilopez10

    Mass attached to a rotating spring

    a) Our force can be represented as: $$\vec F= -k(r-H) \hat r$$ then the equations of motion are: $$\hat r: \ddot r -r {\dot{\theta}}^2=-\frac{k}{m_1}(r-H)$$ $$\hat{\theta}: r \ddot{\theta} + 2 \dot r \dot{\theta}=0$$ Plus we know that angular momentum is constant then $$|\vec L|=m r^2...
  2. U

    Catapult spring, Kinetic and Potential energy

    My solutions: When ball is launched horizontally, assuming its velocity is entirely in the horizontal dimension, there is no interaction of the ball with the gravitational field, thus no change in GPE, so all of the EPE (elastic potential energy ) of the spring is transferred to KE of the ball...
  3. MikeyDoubleDEE

    Need to find the spring constant to achieve Max Velocity

    Hello All. I am mentoring a high school student in my area with his class project for school. He has chosen he wants to launch an object (in our case, a softball) into a 5' diameter area. The idea is to build basically an oversized slingshot using an extension spring as the source of energy. We...
  4. spacestrudel

    How to find the max. compression of a spring given a block on an incline?

    Hello! I am stuck on part of a problem and was wondering what I am doing wrong. For part a of the problem, we were asked to find the impact speed. I did this in a photo below given the following values: Θ = 30 degrees. The initial velocity = 10 m/s. The coefficient of kinetic friction = 0.4...
  5. A

    Maximum Compression for a Block on Spring

    Hi everyone, just a quick question.. I tried this problem using Newtons laws, not conservation of energy, and I got an answer exactly half of what the correct answer is, and I'm not sure why. Here is what I did: Net force = zero once the spring is compressed, therefore mg - kx = 0 mg = kx...
  6. JosephStevens99

    How do I Calculate the Spring Constant of a Piece of PVC pipe?

    Okay so, recently I got a job with my local newspaper delivering newspapers to make some money while deciding how I want to continue my educational career (I already have some college under my belt but I'm taking a semester off). All the newspapers have to be at the houses by 6 am so in order to...
  7. E

    Does the spring force do work on the spring itself?

    Consider a spring with one end attached to a wall and the other to a free mass, which is then stretched so some potential energy U. After it has been released and has de-stretched, the change of elastic potential energy is -U which equates to the negative of the work done by the spring force on...
  8. Like Tony Stark

    Deformation of a spring being accelerated

    I wrote Newton's equations for the block seen from the non inertial frame. The axis are inclined. ##x) Fe+W_x-f*cos(\alpha)=0## ##y) N-f*sin(\alpha)-W_y=0## Where ##f*## is the pseudo-force and ##Fe## is the elastic force. I set the acceleration as 0 because they are in equilibrium. The thing...
  9. Like Tony Stark

    Spring in an accelerating room

    I've solved all the cases in the non inertial system. A) For ##m_1## we have ##x) P_{1x} -T=m.a_x## ##y) N_1 -P_{1y}=m.a_y## For ##m_2## we have ##y) T+F_e -P_2=m.a_y## As it moves with constant velocity I solve it setting ##a_x=0##. So for ##m_1## ##mgsin(\alpha)=T##, then I replace it in...
  10. L

    Shape memory alloy spring

    Do you have any information's about how to calculate the bias spring or the Force needed ? the current necessary to heat the SMA spring for a 4mm stroke ? Thank you
  11. RRouse

    Electric Singing Saw - Spring Steel Alloy (Material Science)

    This is a fun one, sort of! I am working on a singing saw that can be amplified with a regular magnetic pick up, from an electric guitar. I made a blade from laser cut1095 blue tempered spring steel (0.042" thick). It sounded great, but after a few months of service, the blade cracked. What is a...
  12. A

    Box and a Spring on on an inclined plane

    Homework Statement: A box of mass M=30 kg sits on a ramp which is tilted at angle 13 degrees. The coefficients of static and kinetic friction between the box and the ramp are both 0.12. The box is connected to a spring of spring constant k=9 Newtons per meter. Initially, the box is held in...
  13. S

    Reducing the stiffness of a spring?

    I have a spring which I am using to cushion a simple device, but it has proven to be too stiff for the purpose. Is there a way to reduce the stiffness of a spring, without making it brittle or malleable? I have access to ovens which can achieve 550°C, which can also quench in water or poly-oil...
  14. B

    Conservation of Momentum vs Constant k for an Ideal Spring

    I encountered a weird conflict between my thought process and that of author's solution in book: The common viewpoint of both of us were invoking conservation of energy of this SHM system But the author proceeds to solve it using conservation of momentum, taking the new mass added to system as...
  15. T

    Resultant displacement in a stretched spring

    If I take the vector sum, I am getting the angle to be 1. (tan^-1 tan(1)). Is that correct?
  16. jisbon

    Conservation of Energy and change in the length of a spring

    Hola! So my first approach to this is use both the conservation of energy and momentum equations since collision between the first two objects are elastic. Let the 3 blocks be a,b and c (from left to right) Does this means the following: whereby ##v_{a} ##= speed of block a after collision...
  17. Old-Alien

    A string attached to a fixed wall and a mass on a spring

    Hi all. Multiple part problem that I'm really stuck on. I'll attach a file. At first I had attempted the whole problem with the idea that fixed wall was a fixed point, and that the mass on a spring was a "free" point. But I learned later that the mass can't be treated like a "free" point since...
  18. michael872940

    Can I determine mass & spring k from graph of wave, t, a, & vectors?

    Classical problems for hookes law generally give either mass or spring constant. What if I have a graph of a wavelike structure that is oscillating which I can use to measure for example: T (period), t (time), Δx (displacement), v (velocity), a (acceleration) and other variables is this...
  19. Stormzy67

    Elastic potential energy and natural length of a spring- relation?

    I figured out that the spring constant is inversely proportional to the natural length, but there’s still an unknown change in a quantity( most likely extension).
  20. J

    Mass compressing an unattached spring

    How far will the spring extend, given that the block is not attached? Will it extend beyond its natural length? How to calculate at what point the box comes off the spring?
  21. S

    Spring is stretched, then attached to a mass, what is its speed at x?

    Dear all, I am back with another Spring problem. I have tried to use the insights I gained from your help last time: https://www.physicsforums.com/threads/find-v-x-of-a-mass-suspended-from-a-spring.972942/page-3#post-6190934 I figured I start with calculating the new equilibrium by ## x...
  22. Z

    Will a Vertical Spring Drop at the Same Time as a Horizontal Spring?

    if you drop a spring that is elongated via its only weight (slinky) vs another spring that is on its side... will both hit the ground at the same time?
  23. P

    Trying to do the equations for a Spring.

    I was looking at this spring to make a constant torque motor: https://www.ondrives.com/sr119 They come in many sizes and I've been trying to get my head around the specifications so I buy the right one. Take the one I linked above as an example, it's listed as 6.18N (63kg) at the top of...
  24. P

    Making torque calculation from spring specifications

    I was thinking about making a kind of counterbalance weight. So I was looking this spring to make a constant torque motor. https://www.ondrives.com/sr119 They come in many sizes but to take this one as an example it's listed as 6.18N (63kg) at the top of the page. At a glance considering the...
  25. bpaliwal

    Solving Torsion Spring Problem with 100 lb Force

    I am struggling through a problem in one of my designs and would appreciate some help. Please refer to the image attached. Problem Description: S = Torsion spring F = fixed point T = tire A tire is attached to a torsion spring through an arm as shown in the image. The torsion spring has one...
  26. Moara

    Eletromagnetism: Copper Plate on a Spring Oscillating in a Magnetic Field

    Tried to find the resultant force, but I can't see how the magnetic field affects. I used Faraday's law to find the the diferece of potentials in the plate Wich should be B.d.v, where v is the vertical velocity of plate, but there were not given the resistance or resistivity to relate with the...
  27. J

    Spring Problem On inclined plane without numbers, only variables

    So we know that all the energy originates from the spring: E(spring) = (1/2)kd^2 As the block moves up the ramp, friction does work on the block over a distance of 2d: W = μmgcos(θ)* 2d So subtracting the work done by friction from the spring energy, gives us the energy left, so we'll set it...
  28. J

    Spring Car, Acceleration Problem: Find Spring Constant

    "It should be able to accelerate from rest to 20 m/s at least 50 times before the spring needs winding" -So F = -kd = -k(2.1) - d is 2.1 because it is the compression length Now, since we know the d, divide it by 50, 2.1/50 = 0.042m Basically, the spring unwinds 0.042 m 50 times for a total...
  29. J

    How Does Spring Force Affect Net Force in Physics?

    Let's say you have a box and there is a spring attached to it and the other end of the spring is attached to the wall. If you press the box towards the wall the spring presses back against the box with an equal force. F(push) = 20N, F(spring) = -kd. F(push) - F(spring) = F(net). Which is zero...
  30. J

    Two carts connected with a spring -- working with forces and acceleration

    Problem Statement: A 2.0 kg cart and an 8 kg cart are connected by a relaxed, horizontal spring of spring constant 300 N/m. You pull the 8 kg cart with some constant horizontal force. The separation between the carts increases for a short time interval, then remains constant as you continue to...
  31. atim

    Finding period of balls attached with spring

    Which formula do I have to use? and why?
  32. MatheusMazur

    Power spent to keep a spring compressed

    I was wondering, I have an engine that should keep a spring compressed. How can I calculate the power necessary for this? The work is Force x Distance, as there is no distance, there is no work, so no power... But obviously to keep the spring compressed the engine will have to produce a...
  33. D

    Finding the amplitude of a vertical spring

    The question asks for a bunch of stuff, but I have everything except part d down. a) Setting the mass of lemons as m1, I used m1*gh = 1/2mv^2, solving for v of the lemons as v = √2gh, where h is the height at which it is dropped. Then, I used COM and had this equation (not 100% sure if right)...
  34. R

    What is the equation for a spring launcher?

    I am really stuck and confused. I just need the equation. Thanks! Here is my attempt at solving: PEspring = 1/2m(Vx^2 +Vy^2)
  35. K

    MATLAB Spring mass impact system in Matlab - How to correct it?

    I am new to Simulink and I wanted to start practicing using a spring mass damper system. My first tutorial was this: Later, I wanted to model a spring system where a mass moving at a known velocity hits the spring. The governing equation and a similar modeling method given in the previous...
  36. C

    Spring force and the force of friction

    Hello, do someone have time to help me out with an assignment? My question In the answer sheet they say: What I do not understand is why m is withdrawn from both sides, since I don't see that those represent the same mass. When I did the assignment I thought m at the left side would be the...
  37. starnair03

    Which pulse does more work on the spring?

    I thought work is 0 because force is applying perpendicular to the spring's moving direction. these pulses are transverse pulse since those have amplitude, and pulse is moving horizontal, which means applying force horizontally, but spring is moving vertical. So my conclusion is "because pulse...
  38. H

    What is the best resource for information on mechanical springs?

    Hi, Is there a simple formula to calculate the lateral stiffness of a compression spring when both ends stay in parallel (see figure)?
  39. Z

    Does the Velocity of the Center of Mass Consider the Spring and m2?

    I want to know if my solution is correct: The velocity of the center of mass immidiately after m1 has moved is just vcm=m1v1 /(m1+m2) I thing that i have to consider the spring and the m2
  40. S

    Find v(x) of a mass suspended from a spring

    Hi all, I have a problem that I've been grappling with for the past 2 hours. I was confident at first that I found the correct solution, but when I tried to verify I didn't have a constant in my v(x) function. Here is my attempt: I appreciate your help kind internet strangers!
  41. K

    How to find the deceleration of a mass colliding on a spring?

    Problem Statement: A known mass at a know velocity collides on a spring of known stiffness. What is the equation that governs the deceleration of the mass, so that the force on the spring could be found? Relevant Equations: 1/2 m*V^2 = 1/2*k*x^2 + 1/2*m*(Vo)^2 Kinetic energy of mass before...
  42. H

    Spring on a mass that is held back

    Hi. I have a question regarding the above image and want to know whether I am right or not. In the image there is a body with mass m and in the middle of the body there is a spring. The body is pulled upwards and then it hits two fixed rods such that the body cannot move upwards any more. Now...
  43. P

    Understanding resonance in a spring

    I have the equation $$\frac{d^2y}{dt^2} + 5y = 0$$ where I've worked out $$y = Acos(\sqrt5t) + Bsin(\sqrt 5 t)$$ $$y'' = -5Bsin(\sqrt 5 t) $$ using $$y = e^{\lambda x}$$ and using y(0) = 0 (the spring is released from equilibrium) so an external force $$Acos(\omega(t - \phi))$$ is applied so...
  44. Ahmadd

    Spring constant that withstands 110 kg

    Hello, I have a mass of 110 kg and I want to move it with a speed of 14 m/s by using springs. how can I determine the constant of the spring and design it? thank you!
  45. Miles123K

    Normal mode of an infinite spring pendulum system

    First I worked out the dispersion relations, which is pretty easy: ##M \ddot x_j = K x_{j-1} + K x_{j+1} - 2K x_j -mg \frac {x_j} {l} ## (All t-derivatives) We know ##x_j## will be in the form ##Ae^{ijka}e^{-i\omega t}## so the above becomes: ## -\omega^2M = K (e^{-ika}+e^{ika}-2)-\frac {g}...
  46. K

    What is the governing equation of a spring with sinusoidal excitation?

    Hi, Most of the spring vibration lectures assume spring to be fixed on one end and mass on the other end [Example]. In my case, spring has a sinusoidal excitation on one end and mass on other end. Pl. refer the image below. How to get the governing equation? With that I also want to find the...
  47. B

    AQA physics paper On potential energy in mass spring system

    The spring constant of a helical spring is 28 N mñ1. A 0.40 kg mass is suspended from the spring and set into simple harmonic motion of amplitude 60 mm. i use the equation 1/2 change in extension times by force where the force i assume is mass times by 9.8 but the mark scheme uses 1/2 kx ^2 and...
  48. O

    Calculate spring rate in 3 bump scenarios?

    Hi, Working on my vehicle and have a theoretical question I'd like a 2nd opinion on. The physics question is how much influence the force of a bump has in conjunction with a perfectly tuned spring rate can have on ride quality (as crudely defined in vertical acceleration z force m/s squared)...
  49. EEristavi

    2 objects connected by a spring - Minimum Force required to move the objects

    On object 2: There are only 2 horizontal forces - Friction and Tension (of the spring). T = km2g On Object 1: There are 3 horizontal forces and the minimum value for F is when: F - km1g - km2g = 0 F = kg(m1 + m2) However, Solution is: F = kg(m1 + 0.5 m2) Any opinion?
  50. C

    Work Problem -- Wood Block Sliding into a Spring

    W_net = Integral from 0 to 0.70 meters [ - F_spring - F_friction ] = 1/2 * (-k) * x^2 - mu * mg * normal force * x = 1/2 * (-325N/m) * (.70)^2 - 0.250 * 6kg * 9.81m/s^2 * 0.70 - 0 = - 89.93 Joules Is this correct and am I setting this whole thing up correctly? The negative signs have me...
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