# Questions tagged [newtonian-mechanics]

Newtonian mechanics covers the discussion of the movement of classical bodies under the influence of forces by making use of Newton’s three laws. For more general concepts, use [classical-mechanics]. For Newton’s description of gravity, use [newtonian-gravity].

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### Young's modulus for a string that is being applied by two unequal forces at the both ends

In space for example if we apply two forces 10,6 respectively at the end of an elastic string (10 at the right end and 6 at the other) then obviously that body will expand and accelerate. But how ...
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### Does the direction of angular momentum of a table fan different for two people standing behind the fan and in front of the fan?

Does angular momentum of a table fan depend on place of observation? What is its direction of angular momentum of a fan when I stand behind a table fan? In front of a table fan? And along the same ...
1 vote
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### Octopus Ride how much +G force in upward Jerk?

This is a version of the Octopus Ride here: https://www.youtube.com/watch?v=8flmhIAKTvQ They call it Hip Hop but really it is what you call it in other places, I felt my left Butt Cheek or Thigh cramp ...
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### Shape of fastest spinning rod

A one-meter steel rod of variable thickness is attached at one end to a spinning hub. The cross-sectional area of the rod is a function $f(x)$ of the distance $x$ in meters from the hub, x ranging ...
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### What's a good simple model for wind attacking drone?

I'm trying to simulate a drone on https://rapier.rs/. My idea is to do an X shaped object, with a force $P$ on each end of the X, always perpendicular to the drone plane. I want to simulate wind, ...
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### Question on the decaying elliptical orbit of a comet, causing it to impact the earth

Is it theoretically possible for a comet, in an eighty-year elliptical orbit around the earth, to change trajectory due to a friction-like mechanism, resulting in orbital decay that will impact the ...
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### Vortex generated as a result of Newton's third law

This books states this process as a result of Newton's third law. However I just can't find ways to graps how the "vortex" is generated, is it a fundamental law? (The question emerges on the ...
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### Method for calculating balance changes for hanging object with weighted attachments

I've searched extensively and have not found anything similar to this question, apologies if it's some basic textbook problem. It has a direct application in the real world. Also, apologies if my ...
1 vote
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### Are any points at rest on a globe spinning both horizontally and vertically?

Suppose there was a globe which could be spun about polar and horizontal axis. It is first spun about the polar axis, then promptly spun about the horizontal axis. Would any points be at rest?
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### Moving spaceship problem in Special Theory of Relativity [closed]

Answer is (a). I am thinking like this way. According to passengers in moving spaceship, they take 1 hr to reach the Pegasus. Or we can say that as they will find themselves at rest, so the Pegasus ...
181 views

### I don't understand how $F$ equals $ma$ [closed]

I am a beginner in Physics and currently doing laws of motion. So, I don't really understand how the second law is true. It's just that I don't understand how it makes sense. So, we start with the ...
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### Are there things with different physical attributes that serve exact same purpose in a system? [closed]

I’ve been puzzling about this cross-disciplinary concept for the last week. Can you think of any two things that have different physical make up that serve the exact same purpose? For instance, ...
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### How can I know who is accelerating? – Inertial reference frames and relative motion

Suppose I (observer $I$) am standing somewhere in space. I see a region in which my friend ($F$) is accelerating in some direction $\mathrm{\mathbf{\hat{u}}}$. Suppose I see everything in $F$ ...
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### Comparing Rolling Friction with Sliding Friction

Is it possible to compare rolling friction with sliding friction? For example if you measure the sliding friction for a standard chair on a smooth floor and rolling friction for a rolling office ...
1 vote
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### What is physically going on when I stick my finger in a glass of water and the scale tips downards implying it got heavier?

Suppose I have a scale with a glass of water on one side and a counterweight on the other side. If I stick my finger in the glass of water I observe that the water side of the scale becomes heavier ...
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### A block of mass $m$ is kept on a the incline surface of wedge of angle $\theta$. Find minimum acceleration of the wedge so that mass $m$ falls freely [closed]

enter link description here All surface are frictionless. I tried solving this question by resolving normal along x and y but i couldn't get the answer
1 vote
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### Catenary curved string with differing linear densities - Linear density distribution

Do you guys know if there's some kind of weight distribution that fits a problem like this one? Let there be a string with two different sections with different linear densities, like the following ...
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### What will be the change $E2-E1$ in the Energy? [closed]

A 15 kW motor can lift two quintals of water to a height of 300 meters in one minute. If the efficiency of the motor is increased by 5 percent, what will be the change(E2-E1) in the energy consumed to ...
108 views

### What will be the tension in the string in following pendulum question? [closed]

Before downvoting, please read following, you can skip following if you are not downvoting Okay, first of all , before someone downvotes, I want to tell them that this is not just a homework problem ...
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### Dynamics: why do physicists include derivatives like $\dot{\theta}$ in the state space for a system like a pendulum?

I come from statistics, so my experience with physics is spotty, especially on some simple stuff. I have been working on some applications related to control theory lately, and was looking at some ...
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### Calculating the total energy of this thrown ball [closed]

My question is as follows. Assume that a ball of $2kg$ is thrown upwards from the ground at a velocity of $100m/s$. The ball is facing a hindrance by air of $1N$. What is the total energy ($E_p+E_k$) ...
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### Why is it easier to open a door from the far corner (explain without using the concept of torque or energy)? [closed]

I want to understand why is it easier to open a door from the far corner using only linear kinematics and dynamics in your explanation (without using the concept of torque or energy) or in other words,...
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### Spring compressed by external constant force,pot.energy stored over it is half of the work done by force, where does half gone [duplicate]

I have a doubt that for an ideal (massless)spring if apply an constant force over it until equilibrium the energy stored over it is ( kx^2)/2 and the work done by force is kx^2 so where the half of ...
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### How can you figure out when inertia or momentum is keeping the object in motion?

If we consider the case of Earth, inertia carries the Earth forward (inertia alone will make the Earth go out of orbit so gravity keeps it in orbit around the sun), but if we consider the case of a ...
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### What's the "energy formula" for a car with chemical potential energy, friction and drag? [closed]

I'm trying to figure out the "energy formula" corresponding to a car that is circulating on a highway and that is affected by friction and drag at the same time. The problem is that, since ...
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### Closed-form solution in Euler's three-body problem and generalization of it

Euler's three-body problem has a closed-form solution, but I cannot find it for it, but I've only found the equation for potential energy. What is the closed-form solution for the $x$- and $y$-...
1 vote
56 views

### Does the force between two magnetic poles ever reach zero?

If we hold two magnetic like-poles together and start to move them away, would the repelling force reach absolute zero at certain point? In that scenario, as a layman, I think that there is something ...
1 vote
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