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Results tagged with newtonian-mechanics
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user 313823
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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Why would a particle be able to change its angular speed subject to central potential?
I think the main question is "how did that radius change?" Whatever force caused that to happen would be responsible for the alteration in angular speed and overall momentum
- 11.2k
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votes
Accepted
What would happen to an immobile object in a car if the car turns a corner at a consistent v...
Saying "turns right with constant velocity" is a contradiction. Velocity comprises both magnitude (aka speed) and direction. The initial velocity of the car is "14 m/s, North" (for instance), and th …
- 11.2k
2
votes
Classical mechanics centripetal acceleration
Centripetal means "center pointing," and points to the center of the circle. So the centripetal acceleration and the normal force are indeed in the same direction.
FYI, it's much preferred to type out …
- 11.2k
0
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Acceleration in a vacuum?
Yes, for example a meteor falling straight towards the Earth will accelerate until it hits the atmosphere. A ship with a working propulsion system (say electric propulsion) can accelerate indefinitel …
- 11.2k
1
vote
Is there a more concise definition for the 3 states of equilibrium?
I would say that in each of your bold definitions, delete the second sentence and you have the real definition.
- 11.2k
34
votes
Why is the First Law of Motion a physical law?
Newton's first law is not
$\frac {dv}{dt} = 0 \Rightarrow v=\rm{const}$
but
$F = 0 \Rightarrow v=\rm{const}$
In terms of modern mathematics, this would imply to us that acceleration dv/dt is some gene …
- 11.2k
1
vote
Does time causes inertia?
You are getting at a very deep insight. Time and inertia (mass) are intimately related, and massless particles like photons have neither. Any massless particle becomes possessed with inertia and the …
- 11.2k
0
votes
Force being equal at all points in ideal string
It's pretty straightforward, no? Take the free body diagram of any possible slice of the string, and the forces must balance.
If you're talking about a real string with some finite thickness, it's li …
- 11.2k
2
votes
Accepted
How should I apply Hooke's law to spiral helical springs?
If you're asking how to do the measurement, for the first case you can measure the torque to turn the knob by attaching a rod (maybe a small socket wrench) of length $L$. Then, pull the rod using a f …
- 11.2k
0
votes
Newton's third law cancelling
All Newton's 3rd law is really saying is that every force is two sided.
Forces don't act like this
$\longrightarrow$
they act like this
$\longleftrightarrow$
Or this
$\longrightarrow \longleftarrow$
E …
- 11.2k
2
votes
Can a rocket be taken to the edge of space with balloons so it can fly from there?
Getting to orbit is not really a matter of height. It's a matter of speed. You need extremely high sideways velocity (10,000+ mph) to achieve orbit without simply falling back to the ground. The faste …
- 11.2k
1
vote
How do you account for the weight of the lever?
Find the weight of only the side you want, and apply that force halfway between the fulcrum and the edge (ie the center of gravity of that side).
- 11.2k
2
votes
Energy conservation or work-energy theorem?
You seem to be focusing on "time" a force is applied. Potential and Kinetic Energy (the only types relevant here) are state variables, meaning their values depend only on the initial and final states …
- 11.2k
3
votes
Is the normal force the reaction force?
The best way to visualize and solve force problems like this is with a Free Body Diagram, in which you isolate each body and draw all forces acting upon it. That way it is easy to see what forces are …
- 11.2k
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votes
Accepted
How do I find the dimensions of $r$ and $x$ in order to balance this equation?
Force is $N=kg\cdot m\cdot s^{-2}$
Think of weight, mass times acceleration
$W=mg$
$\mathrm {N = kg \cdot m/s^2}$
I also noticed you are trying to algebraically solve for x and r. This is unnecessary …
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