What is Spring: Definition and 999 Discussions

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  1. H

    Motion of mass connected to a spring at constant velocity

    Homework Statement We have a mass m at x = 0 attached to a spring with spring constant k which is moving at constant velocity v such that the position of the spring is described by X = l + vt where l is the equilibrium length of the spring. Solve for the motion of the mass. Homework...
  2. S

    Equal Heights for Two Masses on a Spring: A Question of Energy?

    Homework Statement Two masses A, and B both sit on a vertical spring. If the spring is compressed then released, why do A and B rise to the same height? (the mass of A is greater than that of B) Homework Equations P = mgh S = 1/2kx2 K = 1/2mv2 The Attempt at a Solution Both masses rise to the...
  3. Blockade

    Can someone explain to me the work equation for springs?

    I need to find the work done with springs but I don't understand this equation too well, can someone help me know what are each variable and how to find each of them? WH - fF*d = ΔK + ΔUs + ΔUg? I know that "WH" is the work done by the hand and that "fF*d" is force of friction * displacement...
  4. JulienB

    Spring and string pendulum (oscillations)

    Homework Statement Hi everyone! Here is a new problem about oscillations! Thx to all of you, I'm definitely making progress in the field. Let's see how that problem goes: A pendulum of mass m is hanging on a string of length L and is "pushed" by a spring with spring constant k. At the deepest...
  5. O

    Analyzing a Compressed Spring System

    It's not a homework/coursework question but I did get the system from my textbook. http://puu.sh/o03h7/32cdf7cffb.jpg I solved the question by analyzing the system at different stages. Initially both objects are moving with a velocity and having some mass so their kinetic energies are the...
  6. G

    How to calculate compression of a spring

    centrifugal force apply force to spring while it spinning, how to calculate it's compression. there is no any attached mass on spring. just centrifugal force depends on RPM. weight of spring is important, centrifugal force is changing by radius, so it's not uniform.
  7. Lebombo

    Force and Energy of a block on a spring as it compresses.

    Homework Statement Suppose is a 10kg block sitting at rest on the ledge of a building 20 meters tall. The 10kg block applies a Force of F = ma = 10kg(10m/s^2) = 100N. The potential energy with reference to the ground would then be PE = mgh = 10kg(10m/s^2)(20m) = 2000J. If the 10kg block is...
  8. JulienB

    Coupled spring pendulum (harmonic oscillation)

    Homework Statement Hi everybody! Two masses m1 and m2 are connected with a spring one after the other to a wall (see attached picture). The spring constants are k1 and k2. To consider here are only longitudinal oscillations and no external forces. a) Express the Newtonian equations of motion...
  9. P

    Finding the spring constant of a spring in a pulley system

    Homework Statement Ok so here is the prompt: a 3kg object is fastened to a light spring over a pulley. The pulley is frictionless and its inertia may be neglected. The object is released from rest when the spring is unstretched. If the object drops 0.1 meters before stopping, find the spring...
  10. JulienB

    Rotating bar hanging on a spring (oscillation)

    Homework Statement Hi everybody! I'm trying to solve a basic problem about oscillations, but I struggle to get everything together when it comes to the differential equation...I hope someone can help me to understand it better :) A thin bar of mass m and length l is pivotable about its...
  11. N

    Velocity emparted to a mass by the decompression of a spring

    Homework Statement A 1.5 inch spring is .75 inches at solid length when fully compressed. The spring force is rated at 400 lbs per inch. A 3 kilogram mass will be pushed by the spring. What is the velocity of the mass at the instant the spring has fully decompressed. It will take the spring...
  12. D

    What should be the force constant of the spring?

    Homework Statement You are asked to design spring bumpers for the walls of a parking garage. A freely rolling 1100 kg car moving at 0.66 m/s is to compress the spring no more than 9.0×10−2m before stopping. What should be the force constant of the spring? Assume that the spring has negligible...
  13. A

    I Does the Amplitude of an Undamped Driven Oscillator Stay Constant Over Time?

    The equations I'm getting when I solve the differential equations seem to imply that the amplitude of oscillation does not vary in time. For example, if I have x'' + ω02x = cos(ωt) If we suppose that ω≠ω0, then the general solution should look something like: x(t) = c1cos(ω0t) + c2sin(ω0t)...
  14. B

    How to Solve a Pulley and Spring Problem using Calculus

    Homework Statement The mass of block A is 10kg. The block is at rest and the spring has a K = 25N/m is unstretched when the block is in the position as shown. One second after the block is released, find the acceleration and velocity of the block and the tension in the cable. My teacher gave us...
  15. D

    Schools Anyone have any luck applying to grad school for the Spring?

    In my current time frame for graduating I will be finishing in the Fall of next year. I'm scared because I know a lot of graduate programs don't take people starting in the Spring, so would it be better if I waited an extra semester, maybe take a graduate course or something?
  16. Ameer Bux

    Violation of conservation of energy?

    By squeezing a spring until it coils up, it then has more potential energy. So it will then have more mass, because mass is energy. So doesn't that violate the law of conservation of energy. The spring has more energy and mass after its squeezed than when it wasn't squeezed?
  17. J

    Distorting force vs restoring force in springs?

    Awhile back, I was learning about springs, and restoring/distorting force. We even did an experiment where we hung a spring and put weights on it and pulling it down, watching it oscillate. From this, I assumed the distorting force was the force that stretched the spring and restoring force is...
  18. J

    How Much Should the Spring Be Compressed to Keep the Mass on Track?

    Homework Statement A 50-gram mass is accelerated from rest be a compressed spring (k = 1800 N/m), sending it on a journey along a frictionless loop-de-loop of radius 0.324 m. What minimum amount of initial compression of the spring is required if the mass is to remain in contact with the track...
  19. W

    How do I convert a spring constant of N/cm to N/m

    Homework Statement my spring constant is 85 N/cm and I have to convert to N/m Homework Equations why does stoichiometry not work on this? How would I approach conversions like this? The Attempt at a Solution I tried converting the 85 N/cm to N/m and ended up getting 85*10^2 N/m. This was...
  20. Xavicamps

    Pendulum and spring; Would like to check if the result is correct.

    Homework Statement Spring connected to a pendulum holding a ballwith mass m, length l, spring constant k, spring deflection x, angle of pendulum alpha, angular velocity w.Homework Equations Derive the angular acceleration The Attempt at a Solution I made the three body diagram, and find that...
  21. Benoit

    Tension in a Spring: Find the Difference

    Imagine a spring that has its two ends attached to a wall at the same height. The spring will adopt a kind of a ''U'' shape (maybe a parabollic shape would be more precise). Why are the coils near the wall more distant from each others than the coils at the middle of the spring ? I think it is...
  22. V

    Please help me with this mechanics problem -- pulling one end of a spring

    Homework Statement A spring of unstretched length l has a mass m with one end fixed to a rigid support. Assuming spring to be made of a uniform wire, the kinetic energy possessed by it if its free end is pulled with uniform velocity v is? 2. Homework Equations potential energy stored in a...
  23. P

    What spring constant would I need to jump my height

    In my springs what would the spring constant need to be If I am 1.8m tall and I weigh 68 kg
  24. R

    Spring Compression: Homework Solutions

    Homework Statement Homework Equations ΔUelastic = 1/2(kxf2) - 1/2(kxi2) ΔK + ΔUg + ΔUelastic = 0 The Attempt at a Solution a) I used ΔUelastic = 1/2(kxf2) - 1/2(kxi2) and found xf - 0.126 m. b) Should I use ΔK + ΔUg + ΔUelastic = 0? I am unsure where to start for this one. How do I go about...
  25. ecoo

    How Do Compression Distances Affect Spring Work Calculations?

    Homework Statement I reference the problem posted here: https://www.physicsforums.com/threads/work-and-spring-problem.194531/ Homework Equations Work = Force * Distance F = kx The Attempt at a Solution Wouldn't the limits of integration in part 2 be from 5 to 9, since x is the compression...
  26. K

    Collision between 3 masses, with spring

    Homework Statement The masses C, of magnitude 2m, and B, of magnitude m, move with velocity V and hit a stationary mass A of magnitude m. the collision lasts a very short time and is plastic but the masses don't stick together. the spring with constant k is ideal and the surface is smooth...
  27. J

    Total Length of a Stretched Spring: How Do I Calculate It?

    Homework Statement If I found how much it stretches, do I just add it to the original length I started with to find total new length? For instance, the original length was 1.168m and I found x to be 0.90m, do I just add them together for the total length? Homework Equations F=kx The Attempt...
  28. P

    Finding Spring Constant from Mass and Extension

    Homework Statement A block of mass 1 kg is attached to a spring. The spring extends by 10 cm. Find spring constant.Homework EquationsThe Attempt at a Solution Potential energy of spring = kx2/2 work done by block = PE Hence mg*x=kx2/2 ∴1*9.8*0.1=k*0.1*0.1/2 ∴k=196N/m But solution says mg = kx...
  29. jdawg

    Dynamics: Spring Question Solution

    Homework Statement The collar has a mass of 30 kg and is supported on the rod having a coefficient of kinetic friction of 0.4. The attached spring has an unstretched length of 0.2 m and a stiffness of k =50 N/m. Determine the speed of the collar after the applied force F= 200N causes it to be...
  30. C

    Calculate Friction in Spring hanging from ceiling

    Homework Statement A massless spring with force constant k = 200N/m hangs from the ceiling. A 2.0 kg weight is attached to the free end of the spring and released. If the weight falls 17 cm before starting back upwards, how much work is done by friction during its decent? (Note: choose ground...
  31. K

    Finding average force and time

    Homework Statement When an 98.0-g piece of toast is inserted into a toaster, the toaster's ejection spring is compressed 7.20 cm. When the toaster ejects the toasted slice, the slice reaches a height of 3.4 cm above it's starting position. What is the average force that the ejection spring...
  32. S

    How to take into account Force when comparing two lengths?

    The attached picture sums up my experiment. I used a slinky (a kind of a bouncing spring) to see the relationship between its maximum length when released and the length of its first rebound. However, I released the slinky using various different magnitudes of force. I used a sensor (a LabQuest...
  33. vetgirl1990

    Angular frequency of plank attached to spring

    Homework Statement A horizontal plank (mass 2kg, length 1m) is pivoted at one end. A spring (k=1000N/m) is attached at the other end. Find the angular frequency for small oscillations. Answer: ω=39rad/s Homework Equations ω = √(mgd + kΔxd/I) I think I would be treating the plank as a long...
  34. R

    Spring compression of a bowling ball

    Homework Statement A 5 kg bowling ball moves at 10 m/s on a flat and frictionless surface. It hits a massless bumper with a spring constant of 100 N/cm. How far (in cm) will the spring compress? Homework Equations |F| = |kx| Fnet = ma The Attempt at a Solution This is mostly a plug and chug...
  35. T

    Rotation and vibration of 2 particle spring system

    Homework Statement Homework EquationsThe Attempt at a Solution Is it possible to solve this problem without using Hamiltonian Mechanics (just by Newtonian). My instructor expects use to solve this problem without any knowledge of any advanced classical mechanics. I tried to solve this...
  36. giokrutoi

    Two objects attached with a spring

    Homework Statement on frictionless surface there are two objects m1 = 0.9 kg m2 =1.6 kg at first these two are held by person an spring is shrined L = 10 cm . After that first objet is released and when this object is in it's equilibrium moment another object is released . Find maximal...
  37. I

    Converting energy into torsional spring displacement

    Hello, I'm trying to figure out a general physics problem here and I'm trying to relate energy held in a rotating shaft to be dissipated by a torsional spring. Let's say I have energy E (Joules), shaft outer diameter D, and torsional spring capacity T. T is what I'm designing for with all...
  38. henrco

    Calculate total mechanical energy of a frictionless spring

    Hi, Could you please help me determine if I've worked this problem out correctly. 1. Homework Statement A 2.86-kg object on a frictionless horizontal surface oscillates at the end of a spring with an amplitude of 7.81 cm. Its maximum acceleration is 3.74 m/s2. Calculate the total...
  39. jin94

    Can anyone solve this integral for spring mass oscillation?

    Homework Statement So this is the question I need to solve. I was told to directly integrate the bottom equation to solve for x(t). I can solve (1) by differentiating (1) to turn it into 2nd order difffeq (mx''=kx), but I think I'm not allowed to do that ... I have no idea how to solve (2)...
  40. C

    Find the frequency of the cylinder's vertical vibration

    Homework Statement Homework Equations w = √k/m w = 2π/P ƒ = 1/P The Attempt at a Solution I feel like I'm so close to the answer, I think it has something to do with the fact that there's a spring and pulley in the system that is throwing my answer off. I have √k/m = 2π/P So, P =...
  41. slymme

    Mass hangs in equilibrium on a spring (oscillation)(MCQ)

    Homework Statement A mass M hangs in equilibrium on a spring. M is made to oscillate about the equilibrium position by pulling it down 10 cm and releasing it. The time for M to travel back to the equilibrium position for the first time is 0.5s. Which line, A to D, is correct for these...
  42. S

    Elastic collision with a spring constant and unknown masses

    Homework Statement A ball of mass m rolls down a 3.0 m ramp inclined at 30° above the horizontal, rolls along a flat, friction less surface, and collides elastically with another ball of mass 2m, initially at rest. The second mass then moves along the surface and collides with a horizontally...
  43. S

    How Does Fluid Viscosity Affect Spring Oscillation Period?

    So there is this ball held on a spring. It's radius R = 0.015m , and density ρ=7800kg/m^3. It's oscillation period in air is 1.256 seconds and in the fluid it changes to 1.57 seconds. Find the viscosity of the fluid considering that the drag force obeys Stokes law. I first found the spring...
  44. B

    Statics Tension, Spring, and, DownWard Force

    Homework Statement Homework Equations I am Stuck getting Theta out of the last step of equation. I have found that theta is 35 by trial and error.( i wrote an excel program)[/B]The Attempt at a Solution
  45. R

    Applying first law of thermo to a closed spring piston

    Homework Statement A cylinder having a piston restrained by a linear spring (of spring constant 15 kN/m) contains 0.5 kg of saturated vapor water at 120ºC. Heat is transferred to the water causing piston to rise. If the piston’s cross sectional area is 0.05 m2 and the pressure varies linearly...
  46. L

    Pulley + spring balance problem.

    Homework Statement A light spring passing over a smooth pulley carries a spring balance of mass 1 kg and two weights of masses 1 kg and 2 kg. the reading on the balance will be Homework Equations 3. The Attempt at a Solution [/B] to my knowledge whatever the tension above the spring balance...
  47. A

    Can Heun's Method Accurately Predict Small Oscillations of a Nitrogen Atom?

    Homework Statement Use the Heun method to compute the period of small oscillations about the equilibrium position of a nitrogen atom. xi = 1.1 Um = 7.37 x0 = 1.2 alpha = 2.287 m = 2.325e-26 Homework Equations [/B] U(x) = Um((1-e^(-alpha(x-x0)))^2 - 1) The Attempt at a Solution I was told to...
  48. Titan97

    Thermodynamics problem involving piston and spring

    Homework Statement [/B] Homework Equations $$W=P\Delta V$$ $$\Delta U=nC_v\Delta T$$ The Attempt at a Solution . [/B] The gas is slowly heated. The temperature increases and the pressure increases as well. But since volume increases, the increases in pressure is nullified. The process is...
  49. kostoglotov

    Dynamic Damping in a simple spring system

    Homework Statement imgur link: http://i.imgur.com/Bv3qtPm.png Homework EquationsThe Attempt at a Solution From the FBD it is apparent that there is a constraint -k_1x_1 + k_2(x_2-x_1) + 5\cos{10t} = 0 If you combine this with {x}''_1 = -(k_1+k_2)x_1 + k_2x_2 + 5\cos{10t} and m{x}''_2...
  50. Ben Reade

    Calculating the force in suspension as a car hits the brakes

    Hello, Firstly thank you for reading my post. This is an interesting question I was wondering if anyone here could teach me how to work out. Say if you had a large go-kart (FSAE/Formula Student if anyone knows of that) and you were driving at 120kph and hit the brakes and stopped in 3 seconds...
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