# 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 ...
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### 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 ...
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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 ...
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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. ...
1 vote
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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 ...
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### 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 ...
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### 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 ...
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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 ...
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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 ...
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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 ...
1 vote
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### 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 ...
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### 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 ...
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### 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 ...
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### 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 ...
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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 ...
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### 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 ...
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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 ...
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### 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 ...
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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 ...
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 ...
1 vote
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### 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 $y$ ...
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### 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 ...
1 vote
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### 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 ...
1 vote