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].

Filter by
Sorted by
Tagged with
0 votes
0 answers
8 views

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 ...
user avatar
0 votes
0 answers
7 views

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 ...
user avatar
1 vote
0 answers
12 views

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 ...
user avatar
2 votes
0 answers
25 views

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 ...
user avatar
  • 638
0 votes
0 answers
11 views

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, ...
user avatar
0 votes
1 answer
27 views

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 ...
user avatar
  • 1
0 votes
1 answer
16 views

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 ...
user avatar
0 votes
0 answers
7 views

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 ...
user avatar
  • 1
1 vote
1 answer
36 views

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?
user avatar
  • 23
-2 votes
1 answer
35 views

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 ...
user avatar
  • 255
-1 votes
7 answers
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 ...
user avatar
  • 107
-3 votes
0 answers
26 views

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, ...
user avatar
2 votes
6 answers
1k views

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 $F$ ...
user avatar
0 votes
2 answers
20 views

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 ...
user avatar
1 vote
6 answers
143 views

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 ...
user avatar
-2 votes
0 answers
23 views

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
user avatar
1 vote
1 answer
38 views

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 ...
user avatar
0 votes
0 answers
18 views

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 ...
user avatar
0 votes
0 answers
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 ...
user avatar
  • 465
0 votes
2 answers
66 views

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 ...
user avatar
  • 157
-1 votes
0 answers
28 views

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 ($E_p+E_k$) ...
user avatar
-3 votes
0 answers
54 views

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,...
user avatar
0 votes
0 answers
19 views

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 ...
user avatar
  • 1
0 votes
0 answers
35 views

How to compute the eigenvalues and eigenvectors of the pseudo inertia matrix?

The pseudo-inertia matrix is defined as $\widetilde{\Xi}=\left(\begin{array}{cccc}\frac{1}{2}\left(-I_{x x}+I_{y y}+I_{z z}\right) & -I_{x y} & -I_{x z} & m c_{x} \\ -I_{x y} & \frac{1}...
user avatar
  • 1
0 votes
3 answers
70 views

What is the formula for momentum in a lab reference frame?

When learning momentum in introductory physics, I was taught this formula: $m_1 v_{1i}+m_2 v_{2i}=m_1 v_{1f}+m_2 v_{2f}$. However, my new calculus-based textbook states advises to use the formula $v_{...
user avatar
  • 23
-1 votes
4 answers
56 views

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 ...
user avatar
0 votes
0 answers
24 views

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 ...
user avatar
  • 11
0 votes
1 answer
45 views

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 $y$-...
user avatar
  • 101
1 vote
2 answers
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 ...
user avatar
  • 41
1 vote
1 answer
32 views

Problem trying to graphically represent a 2D vector given angle and intensity [closed]

I'm very new to physics so forgive me if it's a trivial question, but it's something I have trouble figuring out. I'm trying to solve an exercise, and the exercise says that we're given $|\...
user avatar
-1 votes
0 answers
35 views

Applying $F=ma$ to the whole system [closed]

If I apply $F=ma$ to $2m, m$ and $3mg$ in a direction parallel to the surface , then I get $0=2m\cdot0 + 3m \cdot F+m \cdot(F+f\cos \alpha)$. But If I apply $F=ma$ only for $m$ and $3m$, then I get $...
user avatar
2 votes
1 answer
96 views

Bottom point being at rest in pure rolling

We know that,in rolling without slipping,the point of the disc of radius $r$ which is in contact with ground,has two velocities acting on it. One is the linear velocity of center of mass $v_{\mathrm{...
user avatar
  • 667
1 vote
0 answers
47 views

Equations of motion of a car with variable mass and drag [closed]

Lately, I've been trying many ways to attain these equations, yet I've not succeeded in any. I'm basically using Newtonian mechanics because it's the most suitable for this case with dissipative ...
user avatar
  • 11
0 votes
1 answer
22 views

Force diagram - Circular motion [closed]

If the bike is maintaining a horizontal trajectory, what are the forces on it? The solution o this shows weight and a force labelled N at the angle a to the wall. I don't understand that because if N ...
user avatar
0 votes
3 answers
42 views

Why Time of ascent and descent is equal (taken air resistance negligible)?

Time of ascent = Time of descent. My question is, In case of time of ascent gravitation pull is not favouring the motion (retardation occuring) but in case of time of descent gravitation pull is ...
user avatar
-1 votes
0 answers
16 views

I thought that the tension will be in the perpendicular outward direction….. but it was not so as given. I am high school student help with this [closed]

A circular loop of thick rope of mass m and radius R placed on a smooth table is revolving with a speed v about a vertical axis coinciding with the symmetry axis of the rope. Find the tension in the ...
user avatar
0 votes
0 answers
19 views

Force balance equation for the underwater towed body [closed]

The array sonar is towed behind a surface ship on a long cylindrical cable that can be kilometers long. This keeps the array’s sensors away from the ship’s own noise sources, as shown in Fig. 2. ...
user avatar
0 votes
0 answers
22 views

Query Regarding circular motion [closed]

Suppose a particle is moving with tangential acceleration of constant magnitude but with centripetal acceleration magnitude variable with time (suppose proportional to $\,t^2$). Then what does the ...
user avatar
0 votes
1 answer
37 views

Do all objects in a system need to have the same acceleration? [closed]

What is the definition of a system? Could multiple objects accelerating at different magnitudes and directions still be considered a system?
user avatar
  • 23
1 vote
0 answers
19 views

Regarding elastic collision of a projectile in an inclined plane [closed]

A perfectly elastic ball is thrown from the foot of a plane whose inclination to horizontal in $\beta$. If after striking the plane at a distance $R$ from the point of projection it rebounds and ...
user avatar
  • 11
0 votes
0 answers
51 views

Does this situation violate Newton's third law? How? [duplicate]

Consider the following setup: We have an infinitely long current carrying wire placed on the X-axis. At some 'x' distance from it is another current carrying wire of length l and it is perpendicular ...
user avatar
3 votes
2 answers
87 views

Falling yoyo experiment

I was playing with a yoyo and a spring dynamometer and realized the tension during the fall is not constant but clearly has a small oscillatory component. This experimental result contradicts the ...
user avatar
  • 695
1 vote
0 answers
38 views

Why kinetic energy become half when you double the mass of a moving object? [closed]

If a body moving with velocity V and having kinetic energy 1/2 mv2 , if I put a objecf of mass m on it , why does kinetic energy become half ??
user avatar
1 vote
1 answer
41 views

Does the force that need to be applied to pull the weight out of a well by string is more at the start?

One way to estimate depth of the well is attaching a weight to a string then throwing it into the well until it touch a hard surface then pulling the string out of the well and evaluate its length. ...
user avatar
  • 277
0 votes
0 answers
16 views

Negative moment of inertia on incline [duplicate]

This would be the expression for the moment of inertia on an incline $$I=\frac{MR^2(g\sin-a)}{a}$$ however this would suggest that there is a limit to acceleration for certain angles of the incline ...
user avatar
0 votes
3 answers
37 views

Can't figure out my mistake in solving the problem of spring hanged from the ceiling and a weight attached at its end [closed]

A spring with the length $50cm$ and $k=400\frac Nm$ is hanged from the ceiling. Then we attach a weight with the mass $m$ at the end of the spring and while the spring has its normal length, we ...
user avatar
  • 277
1 vote
4 answers
138 views

Why is Tangential Speed unaffected by a change in Centripetal Force?

When we rotate a mass in circular motion the centripetal force due to which the object moves in a circular path . But when we started to move our hand more fastly then we observe that tangential speed ...
user avatar
0 votes
1 answer
43 views

Determine velocity vector on sloped surface

A golf ball is launched at a speed v and launch angle, β . At some point the ball is located on the rim of a hole. The view from above looks as follows: Vector v can be expressed in two components, ...
user avatar
  • 105
1 vote
1 answer
27 views

Experimental design and precision for calculating moment of inertia

Here is the experiment: A hanging mass is placed on one end of a three-step pulley. The pulley rotates a rod with masses, $m_1$ and $m_2$, on each end. Now, we know the moment of inertia of the two ...
user avatar
3 votes
2 answers
45 views

Stress and equilibrium

By newton's third law, all internal forces in a portion of volume must be zero. Thus the total force is due to other volume portions exerting force onto the surface of said portion. However, if one ...
user avatar

1
2 3 4 5
368