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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Confusion in finding stress in accelerated body
On the left side, my teacher shows the method for finding stress on a small element dx of a rod. He treats the tension as the restoring force.
However, my question concerns the diagram on the right ...
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Velocity of efflux when the area of hole is equal to the cross sectional area of the container
From the equation of continuity and Bernoulli's theorem a formula can be derived for the velocity of efflux when it flows from a hole of area "a" such that the cross sectional area of the ...
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Newton's 2nd Law [duplicate]
We know:
$$ F = \frac{dp}{dt} $$
and:
$$p = mv$$
so by simple calculus, is it correct to write:
$$ F = m \frac{dv}{dt} + v \frac{dm}{dt} $$
If not, why not?
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Leaving room for boiling water in a pot on the moon
(In what follows, I'm trying to make sure I've accounted for the dominant effects correctly.)
I have an open pot of water (without a lid) on the stove, in a very usual kind of setup. I don't fill the ...
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Football rolling down a hill
I rolled an American football down a gentle slope of about 10°. Regardless of how I started it, after some distance, it tended to roll around the short axis ($y$-axis). I expected it to roll around ...
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How to calculate effective mass of systems like wedge? [closed]
I am actually 16 so please explain it to me in a easier manner
This was the question. From this i derived the result that effective mass is M+msin²(theta). Can someone explain to me why its in sin ...
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A body has acceleration when the net force acting on it is equal to 0 according to Newton's 2nd law
There is a block $A$ on the table; the friction between the table and the block is not taken into account. A cube $B$ lies on the block, the coefficient of friction between the cube and the block is $...
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Why is it not possible to calculate the power of a classical system of particles by the velocity of the centre of mass? [closed]
Hey I'm a high school student. My question is that if we have a system and we have to calculate the velocity of centre of mass. Now my task is to calculate the power. I took the dot product the ...
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Interpreting one-dimensional Newtonian mechanics using complex numbers? (via Hamiltonian mechanics)
Let the configuration space of a single "point particle" be the one-dimensional affine space $\mathbb{A}^1 \cong \mathbb{R}$, with a chosen linear coordinate chart identifying some ...
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How would one find the speed at a point of a loop de loop in terms of kinematics and not energy? [closed]
I was talking with a prof about loop de loop problems and how they where usually solved in terms of energy when they mention that they could maybe be solves in terms of kinematics but that they’d ...
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The relation between the $x1$, $x2$, $x3$, $L1$ and $L2$. (Constraint equation) [closed]
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Consider the problem shown above in which one of the blocks is pulled with a given force F and you would like to determine the accelerations of all blocks. The main complication in this problem is ...
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Concept of variable component of spring force and it's work done [closed]
A ring of mass m = 10 kg can slide through a vertical rod with friction. It is connected with a spring of force constant k = 400N * m ^ - 1. The relaxed length of the spring is 4m. The ring is ...
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How are the force expressions (body weight, additional weight, and buoyant force) formulated and related in a fluid statics problem?
In fluid dynamics class, I saw a statics problem that dealt with buoyancy using Archimedes’ principle. The problem stated the following:
A wooden plank with a cross section of 7.5 cm × 30 cm and a ...
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I feel like understanding physics leads me to a circular hell hole [closed]
I'm trying to learn physics. I remember taking the class back in community college but honestly, I forgot everything. This time I'm really trying to learn it, not just plug in equations and hope to ...
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Bucket rotated in a vertical plane [duplicate]
This was a "give the reason" question in my textbook.
If a bucket containing water is revolved fast in a vertical plane, the water does not fall even when the bucket is completely inverted.
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