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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Mapping between generalized forces and external torque of a rigid body whose rotation is described by quaternion is not unique (?)
In this paper the mapping between generalized forces and external torques for a rigid body (when the rotation is described by a quaternion) is derived:
$\textit{F}_Q = 2\textbf{G}^TT'$
where $\textit{...
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Find the tension in the string when the string is vertical [closed]
By using Work Energy Theorem, as well as Velocity of centre of mass, I succeeded in finding the velocities of both the ring as well as block. I noticed that there is going to be a vertical circular ...
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Distance traveled by a ball in a rotating rod [closed]
I have a mechanism here.
there is a ball with mass m in a rod with mass M that it is pinned from one side, we release the rod, so it rotates.
at the time when the rod is vertical, the ball has ...
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Why can we treat a ball as a point mass to calculate torque?
A sphere of radius $R$ is supported by a rope attached to a wall as shown in the below figure. The rope makes an angle $\theta$ with respect to the wall. The point where the rope is attached to the ...
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Relative acceleration, mechanics
Consider a system of two objects with mass $M, m$ as presented below.
Assume that there's no friction between both the surface, M and between M, m. I'm asked to find the acceleration of m, M using ...
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How to find resonant frequency of this spherical mass? [closed]
how to find resonant frequency of this spherical mass in the diagram above? and also, the resonance frequency of mass on an elastic beam with viscoelastic contact with the beam
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Spring potential energy, conversion
I have a physics problem in my book, where a spring is compressed and a ball is laying in the end of the spring. When the spring is released the ball will reach a certain speed. In the solution it ...
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A paradox while explaining the equilibrium of books
An even number of books (say four) are held in the manner shown in the figure. It is obvious that if we apply a large force inwards, we can increase the normal force, and hence the friction which ...
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Confusion about sign conventions used in the Doppler formula
Wikipedia gives the Doppler formula as:
$ f = \left( \frac{c \pm v_r}{c \pm v_s} \right) f_0 $
c is the propagation speed of waves in the medium.
$v_r$ is the
speed of the receiver relative to the ...
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Work Done by kinetic friction in Circular Motion
We know when an object is moving in a circular motion on a rough horizontal surface, direction of kinetic friction is constantly. Thus, fto calculate the work doen by friction, we need to use ...
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Tension of rope over frictionless edge obstructing block
Consider the diagram below. All corners are assumed to have no friction. Is it true that the tension throughout the rope is equal in all sections? The section over the edge of the building, the ...
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Was relativistic mass necessary? [closed]
according to newton if velocity is constant then momentum will stay fix as mass would not change according to conservation of mass and if mass changer the newton will be wrong and if it does not then ...
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Does a rocket moving in a circle expel exhaust at a greater velocity?
Consider a rocket undergoing constant acceleration in a rectilinear path. Assuming the rocket is ideal (ignoring fuel mass and energy loss such as sound, radiation, vibration, etc.) a portion of the ...
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What is a simple example that contradicts the theory that light (photons) could have a super small mass? [duplicate]
The obvious example is that, to bring something that has mass to the speed $c$ requires infinite energy due to special relativity. But what if a kid asked me "What if light/photos had a super ...
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Strain energy stored in a bungee cord pulled at its midpoint [closed]
A bungee cord that behaves elastically has an unstressed length $L=.76$ m and a stiffness $k=140$ N/m. The cord is attached to two pegs, distance $b=.38$ m apart, and pulled at its midpoint by a force ...
