Tagged Questions
0
votes
0answers
11 views
Spring damper model does not work very well [migrated]
I'm trying to model a spring damper system from a tutorial that I've found on this site.
If I use the exact same parameters as the ones in the tutorial the system is not stable. I've downloaded the ...
1
vote
1answer
47 views
How do determine the equation of motion of slinky?
I'm trying to analyze the forces exerted to slinky. First, I've divided both ends.
The red vector is the force exerted by slinky itself, and the green vector is gravitational force.
Force exerted ...
3
votes
0answers
48 views
Effective mass in Spring-with-mass/mass system
Suppose you have a particle of mass $m$ fixed to a spring of mass $m_0$ that, in turn, is fixed to some wall. I'm trying to calculate the effective mass $m'$ that appears in the law of motion of the ...
2
votes
3answers
29 views
The motion of a spring
I have a question about the force set by this spring, I saw many times that $\overrightarrow{F}=-Kx\overrightarrow{i}$.
I'm asking why not using $\overrightarrow{F}=Kx\overrightarrow{i}$ without the ...
0
votes
2answers
52 views
Time period for spring connected body
Two identical springs with spring constant $k$ are connected to identical masses of mass $M$, as shown in the figures above. The ratio of the period for the springs connected in parallel (Figure 1) ...
1
vote
0answers
49 views
Does the slinky base stay perfectly level during the initial free fall [duplicate]
In this related question:
Slinky base does not immediately fall due to gravity
It is observed that the base does not fall immediately.
Obviously the center of mass is in free fall, and the tension ...
-4
votes
1answer
47 views
High School Physics student needs help [closed]
A human cannon has a spring constant of 35 000 N/m. The spring can be extended up to 4.5m. How far horizontally would a 65kg clown be fired if the cannon is pointed upward at 45 degrees to the ...
0
votes
1answer
36 views
Period of oscilation [duplicate]
Two masses $m_1$ and $m_2$ are connected by a spring of spring constant $k$ and slide freely without friction along horizontal track. What is period of oscillation? No force influence.
2
votes
1answer
108 views
Two masses attached to a spring
I'm trying to understand the solution of the following problem.
Two masses $m_{1}$ and $m_{2}$ slide freely in a horizontal frictionless track and are connected by a spring whose force constant is ...
0
votes
0answers
36 views
How can I find the frequency? [duplicate]
Grocery stores often have spring scales in their produce department to weigh fruits and vegetables.
The pan of one particular scale has a mass of 0.5 kg, and when you place a 0.5 kg sack of potatoes ...
0
votes
0answers
49 views
Frequency with the spring scale [closed]
Grocery stores often have spring scales in their produce department to weigh fruits and vegetables.
The pan of one particular scale has a mass of $0.5 kg$, and when you place a $0.5 kg$ sack of ...
3
votes
2answers
161 views
Nonuniform acceleration due to rubber rope
What I want:
I have a rubber rope which is $5m$ in length when not stressed and is able to stretch about $100\%$ (to $10m$ long). I want to accelerate a constant mass horizontally, which has ...
0
votes
1answer
74 views
Simple harmonic oscillator system and changes in its total energy
Suppose I have a body of mass $M$ connected to a spring (which is connected to a vertical wall) with a stiffness coefficient of $k$ on some frictionless surface. The body oscillates from point $C$ to ...
0
votes
0answers
44 views
Dynamics of an object hitting a spring [closed]
In a one dimensional universe, there is an object of mass m, heading towards a spring (which is attached to a wall of infinite mass) of spring constant k, at a constant speed of u (i.e. acceleration ...
1
vote
1answer
103 views
rate of change of spring potential energy $\frac{dU}{dt}$
Suppose we have a setup like this. In orange are two wooden sticks sort of things, and they are attached to the block of mass $m$(as usual) at a joint which is hinge type something. A similar ...
0
votes
0answers
97 views
Calculating effective spring constant of trampoline [closed]
A gymnast bouncing a trampoline is performing vertical oscillations. If he bounces very gently, his feet remain in contact with the trampoline at all times. This motion is approximately a simple ...
5
votes
1answer
113 views
Slinky base does not immediately fall due to gravity
Why does the base of this slinky not fall immediately to gravity. My guess is tension in the springs is a force > mass*gravity but even then it is dumbfounding.
0
votes
1answer
103 views
Spring Constant
Is it possible to determine the spring constant of a spring in a situation in which it is being compressed when such certain length of compression is not known? If so, how can such calculation be ...
0
votes
2answers
192 views
Two blocks connected by spring on frictionless surface and Newton's third law
Suppose there is the following situation:
Blocks $A$ and $B$, with masses $m_A$ and $m_B$, are connected by a
light spring on a horizontal, frictionless table. When block $A$ has
acceleration ...
0
votes
1answer
143 views
Hooke's law, springs
A spring AB with constant k is hooked in the end A to the ceiling. At the end B of the undefomed spring is hooked a mass of weight 100N. At $t=0$ the mass is let free with no initial velocity. Not ...
0
votes
0answers
21 views
There's a ball and aspring in this one [closed]
There's a spring (k= 1 N/cm) hanging from the ceiling. a ball (m= 30 g) is thrown upward and it hits the end of the spring at t=0 with the velocity v0=0.3m/s and makes the spring compressed. How long ...
0
votes
0answers
98 views
Spring with mass [closed]
A block of mass $M$ is attached to a spring that has mass $m$ and the force constant $k$. The block is placed on a horizontal frictionless surface. Find the period of small-amplitude oscillations ...
0
votes
0answers
65 views
Mass spring system, increase mass [closed]
The question says that after a mass $m=M$ (attached to a horizontal spring) reaches its furthest point, so at its amplitude, the mass is doubled, $m=2M$.
What happens to the period, amplitude and ...
0
votes
1answer
59 views
Spring extensions
A certain spring has attached to it a mass of 25 units: on increasing the load by 6 units it extends 2.5 cm.
a) What is the time of oscillation under the original load?
b) What will be ...
0
votes
3answers
766 views
How to derive the period of spring pendulum?
So I wanted to find out how to (simply, if that's possible) derive the formula for a period of spring pendulum: $T=2\pi \sqrt{\frac{m}{k}}$. However, Google doesn't help me here as all I see is the ...
1
vote
0answers
132 views
Potential energy of a spring
I have a little problem with the potential energy of a spring... I hope you can help me!
I have two coupled pendula, given by two masses $m$ fixed to two rigid bars (that haven't any mass) and with ...
2
votes
1answer
75 views
How do I account for the direction of friction acting on a spring?
I would like to set up the equations of motion for a simple spring oscillator.
Let's have a spring lying horizontally; we attach a small mass $m$ to the (massless) spring.
The force of the spring ...
0
votes
1answer
475 views
Mass-Spring Damper system - moving surface
I need help with a physics problem, I don't know much about dampers, how can this be solved?
we have
$y_0(x)=\mu\sin(\Omega x)$
We arrive at this equation for motion (where we define $b$ and ...
-1
votes
1answer
50 views
Is this $W_{r} = \frac{1}{2}kx^2 $ procedure correct [closed]
I have a $0.40 Kg$ of mass that has $v= 0.5 m/s$, and then crashes with a spring with constant $k = 750N/m$
Whats the distance that the spring was compressed?
I was using the equation $W_{r} = ...
0
votes
2answers
143 views
Calculating restorative force with Hooke's Law [duplicate]
Possible Duplicate:
Mass points of a Mass-spring model
Say I have a spring like the one in the picture below:
The point at the top is fixed to a ceiling.
The red coloured arrow is the ...
0
votes
1answer
238 views
Mass points of a Mass-spring model
Let's say I have a mass spring model like the one in the picture below:
So, there are 3 parts of the spring joined together in an equilateral triangular manner. Each of the joints has a mass of ...
0
votes
2answers
148 views
Understanding the concept of period of motion in simple harmonic motion formula
I have a spring system, whose position equation is $$x(t) = c_1cos(8 \sqrt{2}t) + c_2sin(8 \sqrt{2}t)$$
The textbook says it will have a period of motion of $\frac{2 \pi}{(8 \sqrt{2}t)}$. I ...
1
vote
4answers
601 views
Spring-mass system with two springs and three masses
I'm trying to solve a system of springs and masses that is confusing me.
First, the balls are all lined up linearly. Secondly, the ball in the middle has a smaller mass $m$ while the first and last ...
0
votes
1answer
423 views
Maximum Kinetic energy of a spring
The block in the figure below lies on a horizontal frictionless
surface and is attached to the free end of the spring, with a spring
constant of 35 N/m. Initially, the spring is at its relaxed ...
0
votes
2answers
259 views
Linear motion with variable acceleration
Consider the following problem
I pull a mass m resting at x = 0 on a frictionless table connected to a spring with some k by an amount A and let it go. What will be its speed at x=0?
I know how to ...
0
votes
0answers
490 views
Finding the period and frequency for simple harmonic motion [closed]
A 1 lb weight is suspended from a spring. Let y give the deflection (in inches) of the weight from its static deflection position, where “up” is the positive direction for y. If the static ...
12
votes
4answers
545 views
Is there a deep reason why springs combine like capacitors?
I was solving a practice Physics GRE and there was a question about springs connected in series and parallel. I was too lazy to derive the way the spring constants add in each case. But I knew how ...
0
votes
1answer
281 views
Two Blocks of mass M1 and M2 are connected by a spring of force constant k [closed]
If Block 1 is elongated towards right to a distance $x_1$ and Block 2 is elongated towards left to a distance of $x_2$ simultaneously, what is the work done by the spring on each of these blocks ...
0
votes
1answer
88 views
Why are there two ways to solve for energy of a spring?
I can find the energy of a spring using $F = -kx$, or by using the formula $e = 1/2mv^2 + 1/2I\omega^2 + mgh + 1/2kx^2$. The first way, I get $mg/k = x$, but the second way, I get $2mg/k = x$. Which ...
1
vote
0answers
94 views
Hooke's Law and the shape of coils
I've learned in school that the force in a coil is $F=kx$, linear on how much the coil is stretched. Two questions:
Is it always linear for every shape of a coil? Does it remain linear if we ...
0
votes
0answers
179 views
The Gravity Spring [closed]
This problem examines the scenario of a tunnel drilled through the center of the Earth, and the length of time required for an object to fall through the hole and back again.
use trigonometry to ...
2
votes
2answers
204 views
Why do joined massless springs, act like a rope under tension?
In an oscillations exercise there is a spring attached to another spring, attached to a block.
Long story short: I have to find the global $k$.
In the solutions it says:
"Because the springs are ...
2
votes
1answer
145 views
Does a slinky hanging downward double in length if gravity doubles?
Also would a spring under tension greater than the force of gravity pulling the spring downward shrink in both directions until it has depleted it's stored energy while in free fall?
0
votes
1answer
141 views
Value and direction of the force applied by a rubberband on an object
Is there a model that would allow me to compute the value and the direction of the force F applied to the object in this case:
I have to fixed points: $ A = (-l/2,0) $ and $B=(l/2,0)$. A rubberband of ...
0
votes
1answer
377 views
Is a series of springs compared to a single spring of equal length stronger and more reliable [closed]
All else being equal, is an optimal series of ideal springs stronger and more reliable then a single optimal and ideal spring of equal length?
-1
votes
2answers
327 views
Where can I find spring force problems, with solutions, that involve rectangular coil springs [closed]
Where can I find compression spring force problems and associated solutions that utilize rectangular coil springs?
-1
votes
1answer
79 views
I think there is a mistake in solutions to this problem. plus and minus sign
!
I pretty much had what the solutions had, but we disagreed with one thing, a minus sensitive sign.
$\sum W = \Delta K$
$\int_0^{-s} - ks^2 ds = \frac{ks^3}{3} = \frac{1}{2}m(v^2-4^2)$
...
0
votes
0answers
72 views
Springs yet again, this time with a picture. Infinite displacement, makes no sense [duplicate]
Possible Duplicate:
How could this damped oscillator ever go to infinity? Or negative infinity for that matter?
Consider this
!
Where I purposely drew the right arrow bigger than the left ...
2
votes
1answer
133 views
Could someone explain to me why this is sometimes right and sometimes not?
I do not remember when, but a while a ago I was told that for a spring with stiffness $k$ and a mass $m$, the equation $-kx = ma$ never holds. (assume a horizontal spring)
So if I was given a problem ...
0
votes
2answers
88 views
The time for which rear moving block remain in contact with spring in the following situation? [closed]
I'm a physics tutor. I'm stuck up with this question. I've no clue about how to proceed with this question. Can any one help?
A 2 Kg block moving with 10 m/s strikes a spring of constant π^2 N/m ...
