Questions tagged [newtonian-mechanics]

Newtonian mechanics discusses the movement of classical bodies under the influence of forces by applying Newton’s three laws. For more general concepts, use [classical-mechanics]. For Newton’s description of gravity, use [newtonian-gravity].

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Conceptual misunderstanding in Buoyant forces

This is the problem:A piece of ice floats in a vessel with water above which a layer of a lighter oil is poured. How will the level of the interface change after the whole of ice melts? What will be ...
Hammock's user avatar
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5 votes
3 answers
366 views

How do we identify whether the work done by static friction is zero or not?

Ok, so I was reading my book and there I found this statement: We can conclude that the work done by static friction can be positive, negative or zero. When we consider the net work done by static ...
Adhway's user avatar
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Can someone answer a question about centrifugal force and gravity?

I have a question! I’m doing a school project on centrifugal force and gravity. I know that for every increase in speed, there is an expounding increase in pressure, which very quickly becomes some ...
ScienceRocks77's user avatar
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1 answer
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Pendulum equation

idk if that kind of question is allowed here, if not, my bad. i alway seen the massless pendulum equation, where at end of all deduction you have something like $$\frac{d^2\theta}{dt^2}+\frac{g}{L}\...
cand's user avatar
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1 answer
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Has a heavier atmosphere and the relocation of oil around the Earth had a measurable effect on the rotation of the Earth?

I am wondering if the man-made carbon emissions put in the Earth's atmosphere over the past 100+ years, and also the relocation of oil around the Earth over this same time period, has had any ...
user57467's user avatar
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Can a atomic model based solely based on relativity (General,special) be useful in describing gravity as quantum mechanics fails to describe gravity? [closed]

Similar to various mechanics such as Hamiltonian, Newtonian, and Lagrangian, building an atomic model based on both general and special relativity is conceivable. While the quantum mechanical model of ...
agrim pokharel's user avatar
1 vote
0 answers
69 views

A simple picture for the temperature vs density curve?

Consider $N$ particles interacting through a 6-12 Lennard-Jones pair potential (defined with particle radius $\sigma$ and energy barrier $\epsilon$) within a closed volume $V$ and evolving with ...
YoussefMabrouk's user avatar
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Can action be local in a non-relativistic theory?

Say we have a theory of a particle with action $$\int dt\mathcal{L(x,\dot{x})} = \frac{m}{2}\int dt\dot{x}^2$$Action is local if the integrand of the system depends only on the particle's position and ...
DJames's user avatar
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How does normal force play a role in this equation? [closed]

While searching online, I found the question. A uniform rod of mass 30. kg and length 4.0 m is supported from underneath at its left end and at a point a distance of 0.80 m from the middle. Calculate ...
Aarush Tulsyan's user avatar
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2 answers
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On which side of object should friction force be drawn on a vector diagram?

Let's say a box is moving to the right and friction is slowing it down. The friction force vector pointing to the left and the object moving to the right, should the vector be drawn on the left side ...
Jaakko Kangas's user avatar
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What is the speed of the ball according to Aisha? [closed]

David a good bowler, is in the primed frame. He rolls a ball at 8.50m/s in the $x'$ direction. The bowling lane in the primed frame is 18.3m long. The primed frame's speed with respect to Aisha in the ...
Abraham Precious's user avatar
1 vote
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A Hotwheels Problem [duplicate]

I have a Hotwheels track set. It has a looped structure such that at some point in the car's trajectory, it becomes upside down. But in such a situation, it doesn't fall to the ground. I understand ...
Golden_Hawk's user avatar
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Question on height of a jump in terms of Power (from WPE chapter, JEE level) [closed]

This is an interesting question I came about and I am not sure how to proceed. I used the equation P = Work done/time $\rightarrow P = \frac{1}{2t} mv^2$. I then multiplied by s on both sides and got: ...
ANNJEE's user avatar
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Buckling Question from Hibbler Textbook

Hello! I have a question from the Hibbler Textbook on Mechanics of Materials! The exact statement of the problem reads: "A W150 * 24 steel column is 8 m long and is fixed at its ends as shown in ...
jk gan's user avatar
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2 votes
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How does the Dzhanibekov Effect change if replaced with a propeller?

Every explanation and example uses a t-bar. But what if the "bar" was a propeller? I can understand there being no difference if it's a vacuum, but I would think the aerodynamics would ...
Dair Schermerhorn's user avatar
-1 votes
0 answers
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Find magnitude of cars acceleration [closed]

A student constructs an accelerometer by attaching cork balls to strings anchored to the bottom of a fish tank. When the student fills the tank with water, the balls float to the surface. When the ...
Pacific Oilers's user avatar
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German vs Chinese Maglev Train [closed]

Maglev train is shown above which is probably use by the China Sky Bridge Train which levitates on repulsive permanent magnets only. Meanwhile, the German Transrapid uses electromagnet to levitate on ...
Maximus Su's user avatar
-6 votes
0 answers
32 views

Eigenvalues, Eigenvectors, Matlab tfestimate [closed]

Could someone help please! I have to find in analytical way (self-calculate) the eigenvalues and eigenvectors of this system. I also have to write the code in matlab by using tfestimate function. Then ...
Agnesa Sopaj's user avatar
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0 answers
24 views

What are the conditions for tipping of a table dropped onto moving belt? [closed]

Case 1, the belt has high friction, and the table with front and aft legs is dropped onto the moving belt. Table width is w, height h, cg. Is at 0.9 h, w/2. Initially the table so not moving and it ...
John's user avatar
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Boat-river problem [closed]

A river flows from east to west at 4 km/hr. From the north bank of the river, the first boat starts traveling straight towards the other bank at a speed of 10 km/h. The second boat starts moving along ...
Saim Arafat's user avatar
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Motion of Pressure Propelled Box

The problem is this: Suppose there is a rigid box with known volume V in deep space that has an extremely pressurized gas inside of it (known pressure p), at some known initial temperature T, with ...
adam7's user avatar
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2 votes
3 answers
277 views

Static friction when rolling with constant speed

(I know that similar questions have been asked before, but I would like to ask very specific questions about this specific image that I do not understand). Let's say that we have a wheel of a car that ...
Stallmp's user avatar
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1 answer
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Maximum Velocity of Car in Circular Motion Without Tipping?

We are tasked with finding the maximum velocity of a 4-wheeled vehicle undergoing circular motion without tipping (assuming that the force of gravity will act at the car's center of mass and the the ...
naebkcaj's user avatar
0 votes
1 answer
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Kinetic energy, beginner question [closed]

so if 1J is equivalent to the kinetic energy of a 2kg-mass moving at 1m/s, and 1kcal (4184J) is the energy needed to heat 1l of water up by one degree celsius, then 1kcal is equivalent to the kinetic ...
Spi-Phi Quotes's user avatar
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1 answer
41 views

Why does a spinning top with mass farther away from the center spins for more time?

Consider that I have two exact spinning tops (same format, same height, same tip), but one has most of its mass distributed on the outside part of it (spinning top 1), and the other one has the same ...
cfernandez's user avatar
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0 answers
25 views

Fully ellastic collision of 2d ellipses

I want to describe the behavior of two identical 2d ellipses with mass $m$ (rigid bodies), parametrized by $\phi_{a,b}(\alpha)=(a\cos(\alpha),b\sin(\alpha))$, after a fully ellastic collision without ...
Jfischer's user avatar
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0 votes
1 answer
21 views

2 objects heading towards each other at a certain distance and with initial velocity and friction coefficient [closed]

I'm not a physics student. I'm a programmer. But I found this physics problem interesting and I would like to understand how to approach it. 2 objects, A and B, heading towards each other at a certain ...
Jeremy Then's user avatar
-2 votes
0 answers
77 views

Does the acceleration formula from dynamics apply in all cases?

Can the formula for acceleration $$a=\frac{F}m $$ (where $a$=acceleration, $F$=force ,$m$=mass) be used in all cases ? Or is it an isolated formula used only for some cases ?
omnkkm's user avatar
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Is there an error here relating to a velocity vector? [closed]

In a kinetics work & energy / work balance question we are given a diagram in which an upper conveyor transfers boxes onto a sloping ramp which in turn carries the boxes down to a lower conveyor. ...
DoobJohn's user avatar
1 vote
1 answer
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Combing different SHMs which are in the same direction

Our teacher taught us this method for combining different SHMs he didn't really give a lot of formal defination etc he just said us about the algorithm to solve it as shown in the picture what seemed ...
Anshu Gupta's user avatar
21 votes
5 answers
6k views

Why does a plastic bag rip when it is raised to a higher position when being held but not when it is stationary?

Let me preface this by saying I am not a physics expert, but this is something I was wondering and I would love a technical explanation. For example, say you're walking with an filled plastic grocery ...
user385891's user avatar
0 votes
1 answer
29 views

Possibility of losing contact when a block is sliding on a moving plane [closed]

In this problem, if M is sufficiently small and m is sufficiently large, is it possible that the block and the plane losing contact at some point during the block sliding down from the plane? My first ...
zzzzz's user avatar
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-1 votes
0 answers
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Circular motion cause by friction [closed]

Imagine if a box tied on string is swirl around a rough surface. The centripetal force might be contributed by both tension and friction. Since the surface of the object is flat instead of spherical ...
Pck Tsp's user avatar
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0 votes
2 answers
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Solving for deceptively simple two-block pulley system [closed]

I've encountered a pulley system that is visually intriguing and deceptively straightforward. The setup involves two blocks, A & B. Block A has mass m Block B ...
Dost Arora's user avatar
-2 votes
0 answers
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Falling Blocks and Forces [closed]

After discussing this problem with multiple others, I've heard tons of different answers. I understand the explanations for both A and D. I've found differing sources on the web for this question as ...
Tyler Reynolds's user avatar
1 vote
2 answers
51 views

Can the schwarzchild radius for black hole be obtained from Newton's law of universal gravitation? [duplicate]

The universal law of gravitation of Newton calculate the intensity of gravitational force by the radius and mass of an body.. so in a black hole there is very much small radius and a large amount of ...
Rehan 's user avatar
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0 votes
0 answers
15 views

What force balances the weight of an object that is tied to the string and is in UCM [closed]

If a stone was tied To a string and then we made it undergo uniform circular motion. Is the centripetal force provided by both the weight and tension or the tension only? What force balances the ...
Spluesh's user avatar
0 votes
2 answers
64 views

Gravitational potential energy in Escape Velocity

From the derivation of formula of Escape Velocity we know that Minimum kinetic energy = Gravitational Potential Energy But in this circumstance, isn't it the value of gravitational potential energy ...
ZhangJin's user avatar
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0 answers
72 views

In order for Sound to exist, are Spacetime, Matter & Motion required first, in that exact order?

From what I’ve read so far online, briefly reading Newton, Einstein, and Minkowski’s theories this is the order I’ve come to. I.e, for matter to exist first there has to be space and time, for motion ...
Lecifer's user avatar
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1 answer
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Direction of undetermined contact force & undetermined Normal force [closed]

I am not getting the following sattements related to contact force and normal force which are: If the direction of contact force cannot be determined, it should be shown as two components. If ...
Akash Talukdar's user avatar
2 votes
1 answer
63 views

Bar suspended by three vertical ropes [closed]

A two dimensional homogeneous bar of mass m is suspended by three vertical inelastic ropes. The bar is horizontal and in equilibrium. One rope is fixed in the middle of the length of the bar (at point ...
ut813's user avatar
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0 votes
1 answer
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Why the compression of a gas don't produce sound?

The compression of a gas produces an increase in temperature and therefore greater kinetic energy of the particles due to the exchange of momentum between the piston wall. Is this transferred energy ...
Gabriel Rocha Furtado's user avatar
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1 answer
37 views

Why is the output torque less than the input force of 20N applied from a wrench having length of 0.8m?

A wrench is of length 0.8m, or any number below 1.0m, I am exerting a force of 20 Newtons on the point A (one end of the wrench), on point B there is a bolt (on other end). If I calculate the Torque ...
Newbee's user avatar
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-4 votes
0 answers
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A force acts in a 30g particle in a way so that displacement acts as function of time $s = t³-4t²+3t$ in SI units. The work done in first 4 sec is: [closed]

The formula for work is $\vec F\cdot\vec s=Fs\cos\theta$ or you can use integral operators for the same But by doing so, I am getting two different answers. One is 5.4J and one is 5.28J. The question ...
Krishang Rana's user avatar
-1 votes
0 answers
51 views

Two rings, a frictionless rod, a string and a hanging mass [closed]

It's been days I'm not been able to figure out why I'm getting an incorrect result for this problem: Two rings of equal mass $m$ can slide along a horizontal rod. The rings are linked by an ...
drssalainus's user avatar
1 vote
2 answers
68 views

Is projection of a simple pendulum, doing SHM as well?

I know projection/shadow of a Uniform Cirular Motion does SHM, and a simple pendulum also does shm. But I was wondering whether, for a pendulum in $xy$ plane having its central axis parallel to $y$ ...
Amit Rai's user avatar
0 votes
0 answers
21 views

Potential energy curve for spring attached to pulley [closed]

Assume a block of mass $m$ is held in place and is attached by a pulley to spring with constant $k$ at equilibrium attached to the ground. The mass of the pulley and spring is negligible. What would a ...
Ring Bling's user avatar
1 vote
0 answers
8 views

Trajectories arising from certain Toeplitz systems, are they closed?

A 2-d anisotropic harmonic oscillator's trajectory describes a Lissajous pattern whose frequencies are $sin(2\pi n/N)$ and $sin(2\pi m/N)$. Integer $N$, of course. For what non-trivial pairs of ...
Strunk's user avatar
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1 vote
3 answers
84 views

How can the energy of a system increase even if net work done on it is zero?

Imagine two blocks of mass 1kg placed on a horizontal frictionless surface. Now, if I apply 10 N on the right block in the right direction, and on the left block in the left direction, both the ...
Arjun Sharma's user avatar
5 votes
0 answers
101 views

What happens if you're sitting in a wheelchair and you turn only one wheel?

My friend was sitting in a wheelchair, with a cup of coffee in one hand. That made me wonder, how would the wheelchair move if he turned only one rear wheel? He tried it, using his right hand to turn ...
Dan's user avatar
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