# 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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### Question about a harmonic oscillator

I was solving the following problem on harmonic oscillation and I don't understand a specific part in the proof. I will emphasize (italic) the part which I don't understand. Problem: The following ...
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### How can I know which direction the system will move?

Pin A is fixed to link EC, DO is rotating clockwise as shown. How do I know if CE will rotate clockwise/counter clockwise? I fail to imagine the movement in this case. On A, there is a normal force ...
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### Why is the work done by an expanding ideal gas $\textbf{P}_{ext}\Delta V$?

Consider an ideal gas in a cubical container as our system (only the gas is the system, not the walls of the container). If I understand correctly, if the gas expands at constant pressure $P_{int}$ ...
543 views

### Confusion regarding torque and calculating linear/angular acceleration of an object when a force is applied a distance from its center of mass?

From what I have read/learned about torque, it appears that it is derived based on the idea that applying a force farther from a point about which an object rotates increases the rotational force ...
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### What happens if a slow train hits you?

It's funny, I used to wonder this at school many years ago. For the purposes of discussion, imagine there is a big (very massive) cube that slides towards you as you're sitting on the floor. It doesn'...
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### Arnold´s Math Methods of Classical Mechs - a question on Newtonian Mechanics

There is the following question/answer on Arnold´s book Mathematical Methods of Classical page 10. Arnold's Question A mechanical system consists of two points. At the initial moment their ...
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### At what $ω$ would the dust particles fly off the tilted rotating disc?

I've been struggling with question below: "A metal disc of radius R can rotate about the vertical axis passing through its centre. The top surface of the disc is uniformly covered with dust ...
1 vote
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### What is the relativistic Hamiltonian for a charged particle in an EM field, using the magnetic scalar potential?

The Hamiltonian for a relativistic charged particle moving in a static electromagnetic field is the well known: $$H=c\sqrt{\left(\mathbf{P}-q\mathbf{A}\right)^{2}+m^{2}c^{2}}+q\phi$$ where,\begin{...
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### What are pre-collisions and post-collisions in forces and momentum?

What are pre-collision and post-collision exactly? I assume it is before collision and after collision. I can not find an answer on google.
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### Angle for ruler falling off the table

When you place a ruler on the edge of the table so that one end is hanging off the table, and you apply a force to the hanging end with your hand, at what angle (angle between ruler and table) will ...
1 vote
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1 vote
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### Force and torque provided by a string on pulley

Suppose there is a pulley of mass m and two blocks are suspended on both sides of the pulley. Now what are the forces that the string applies on the pulley? I can visualise the normal force acting ...
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### Skating off an edge with torque ambiguity

Problem In this particular case of a dynamic skating motion combining translation and rotation, I consider the question of determining the appropriate torques and applying the correct rotational ...