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Results tagged with newtonian-mechanics
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user 190100
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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Trajectory of a particle moving outwards in a circular force
If we put a little stick through a ring, extend our arm holding the stick, and start twisting (we perform circular motion), then the ring will move outwards until it falls from the stick.
What is the …
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Accepted
Calculating travel time of an object on the inclined plane
I believe you made some mistakes involving signs.
In the first place, for consistency between the equations, the velocity should be written $v = v_0 + a t$ (notice the $+$ sign instead of $-$).
That b …
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Cannot this result be deduced?
In the physics book I am reading, Mecánica elemental by Juan Roederer, the concept of gravitational mass is introduced by a series of ideal experiments:
Body $O$ is fixed at the origin and body $1$ …
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Tension in string in Atwood's machine
In general, tensions will not be equal. But it is usually assumed that the rope is an ideal one, and this means that it has zero mass, among other things. So when you write Newton's 2nd Law for the ro …
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Atwood's machine doubt
Light pulley means $m = 0$. Then, when you take torques acting upon the pulley (w.r.t. the center of the pulley): $ T_1 R - T_2 R = I \alpha = 0$ (because $m=0 \implies I=0$). Then, $T_1 = T_2$.
Actua …
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Why isn't constant pull a conservative force?
Consider the following diagram:
The force $\mathbf{F} = 1 \textrm{ N} \hat{\imath}$ is being applied all time as the ball goes from A to B (assume positive $x$ to the right.) Now, there are a few equ …
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Static friction acting on both bodies in half-atwood machine
Consider the following figure. Let's say we want to find the static friction force acting on each mass for the system to remain at rest.
$$T - F_1 = 0$$
$$m_2 g - T - F_2 = 0$$
So these are $2$ equat …
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Direction of a system of particles
i guess anything made of particles can be called a system of particles... and certainly these particles may have their own acceleration. Are you sure you got that definition right?
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Angular Acceleration about stationary point in pure rolling
Angular acceleration is the same with respect to any two parallel axes crossing the rigid body, not only those that cross it through the points you mention. Its easier to prove first that angular velo …
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Why isn't energy conserved for this particle?
The picture below shows a particle $A$ linked to a disk through a massless rod. The rod can freely turn, with no friction, around a fixed axis that goes through the center of the disk. The system is i …
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How can you push the ground backwards?
the answer is depicted in the first image you posted. There is a force $F_{push}$ applied on the floor, by the runner. This force is neither perfectly horizontal nor vertical. It is oblique to the flo …
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Do Newton's laws of motion hold true in non-inertial frames of reference?
This derivation actually uses $v_{rel}$ because the author found more convenient to write the equations this way. But this does not mean that the system is being described from the rocket reference fr …
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Why are the resonant frequencies for displacement, velocity and acceleration different in a ...
I think that the confusion I have may stem from the simple question: why does the frequency that produces maximum power absorption (ω=ω0 when the driving force is in phase with the velocity) not lead …
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Distribution of Potential and Kinetic energies of a system consisting of two charges
Strictly speaking, the equation $\Delta U_E = \frac{1}{4\pi\epsilon_0}Q_1Q_2(\frac{1}{d'}-\frac{1}{d})$ holds for electrostatic potential energy, so this only makes sense when both charges are static. …
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