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Results tagged with newtonian-mechanics
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user 365931
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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Multiple bodies and coordinate systems
Say we have a pulley with two masses attached, say $m$ and $M$, and they both accelerate at the same rate but in opposite directions, why can we solve the two equations of motion simultaneously if the …
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Rocket lift off and relative velocities
Say we had a rocket that was moving in the air at a velocity $100m/s$ (I know this isnt realistic at all but its to keep the maths easy) and the fuel was being ejected at a velocitiy $-10m/s$, negativ …
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Why is kinetic energy a scalar?
I know that the formula for kinetic energy is $\frac{1}{2}$$mv^2$, and such that when we calculate it, we use the speed and not the velocity. Why is it that we use $v$ in the equation, and then procee …
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$F = ma$, instantaneous Vs average [closed]
Are $\vec{F}$ and $\vec{a}$, in $\vec{F}=m \vec{a}$ instantaneous or average values (with respect to time)?
As F=ma is short for change in momentum/time, surely $a$ is an average?
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Kinetic friction [duplicate]
Say we had an object moving at speed $v$ with only KINETIC friction (approximately $\mu$$R$) acting on it, I know that it will decelerate due to the net force and eventually come to a rest with $v=0$ …
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Forces acting in a system (internal/external)
Consider a rocket taking off. It can be thought of two objects, a body and the ejected fuel. At some point in time (instantaneously) the mass of the body is $m$ and the mass of the fuel ejected is $M$ …
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Objects on inclined planes and the normal force [closed]
Say we had an object lying on a inclined plane, at an angle of $\theta$ to the horizontal, and the object has a mass of $m$. If we take the obejct to have an acceleration of 0 perpendicular to the pl …
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Work done by gravity confusion
Say we had an object at height $h$ in a gravitational field, and of mass $m$, its GPE would equal $mgh$, now say we dropped it and it fell a distance of $h$, the work done on the object would be equal …
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Why do we say that the force on a body is equal to the rate of change of momentum, if they a...
I'm just a bit confused.
I understand that $F = \Delta p/\Delta t$, but I also know that $F$ is proportional to $\Delta p$, hence shouldn't $F = k \Delta p/\Delta t$?
Why is it that we ignore the cons …
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