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Questions tagged [newtonian-mechanics]

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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Do these two refer to the same reference frame?

What exactly is the difference between a reference frame and a coordinate system (with respect to classical mechanics only) ? Can we claim that these two coordinate systems is from same reference ...
Kampann's user avatar
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Conceptual doubt in existence of normal force in a constrained motion problem

I was solving a problem on Wedge-constrained motion. Given below is it's diagram. This system is released from rest. All surfaces are assumed to be frictionless and string is inextensible. I have ...
Chetan's user avatar
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Conceptual doubt related to normal force in a two-block system kept on frictionless surface

I was solving this question in which we had to calculate the normal force between blocks $m_1$ and $m_2$ Here, two blocks of mass $m_1$ and $m_2$ are in contact on a frictionless surface, and a force ...
Chetan's user avatar
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Spinning mass around Spring with gravity

I've seen similar posts, but none in which a mass rotates vertically while connected to a spring, with gravity acting on the mass. I want to know if the path of the mass can be described with ...
T.B.'s user avatar
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Drag force equation as a function of time

Can someone help me derive an equation for the drag force ($v^2$ drag) on an object as a function of time? I can't figure it out and I have looked everywhere. I have taken AP Mechanics and have an ...
Frontiers Aerospace's user avatar
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Deriving Lagrangian mechanics from Hamiltonian mechanics [duplicate]

I have just finished reading Susskind's Theoretical Minimum. I think I got it well, even found some mistakes in few equations🙈 The book starts from Newtonian Mechanics, then derives Lagrangian ...
user121882's user avatar
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Volleyball serve trajectory

When I was in high school, I played Volleyball in a regional team. First we learned that the underhand serve is basically useless. Then we learned the over-head hit. Then we moved to the run-and-jump-...
birdpoolcleaner's user avatar
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Conservation of momentum while a lump of putty drops on a block in SHM

This is Example 14.5 from Young and Freedman's University Physics on energy and momentum in SHM. A block of mass $M$ attached to a horizontal spring with force constant $k$ is moving in SHM with ...
nomadicmathematician's user avatar
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Wedge constrained motion problem [closed]

I was solving this question on wedge-constrained motion: Q)Acceleration of blocks A and C are 2a and 3a respectively. Find the acceleration of block B. My Approach: Below I'm attaching a diagram ...
Chetan's user avatar
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Stretching vs bending of thin membrane

Stretching refers to the deformation of a material when a tensile (pulling) force is applied. The material elongates along the direction of the applied force. Bending involves the deformation of a ...
Remember's user avatar
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Can a non-inertial frame be viewed as an inertial frame

Let's consider a non-inertial frame with an acceleration of $a$ relative to an inertial frame, if $a$ is really small and we don't need extreme accuracy, can we ignore this acceleration and treat this ...
Polaris5744's user avatar
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What is $F$ and what is $P$ in the sentence "$F × dP$ is a total differential"?

The physicist Emilio Segrè, as a student, attended lessons of Calculus given by Francesco Severi and of Analytical Mechanics given by Tullio Levi-Civita. Segrè wrote in his autobiography1 For many ...
Alessandro Jacopson's user avatar
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How do force and mass work with all derivatives of position?

I think if $F(t) = kt^0$ then $$x(t) = x_0 + v_0t + \frac{k}{m}\frac{t^2}{2!},$$ and if $F(t) = kt^1$ then $$x(t) = x_0 + v_0t + \frac{k}{m} \frac{t^2}{2!} + \frac{k}{m} \frac{t^3}{3!},$$ and so on, ...
clara raquel's user avatar
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Can two particles ever be in equilibrium under their mutual gravitational forces alone?

Can two particles be in equilibrium under the influence of their mutual gravitational forces alone? Obviously, if the two particles are kept at rest at a distance apart, one will exert an attractive ...
Solidification's user avatar
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It's more like a simple math question but how does this process to that? [closed]

I tried to adjust the equation multiple times to make it look like the second one, but I kept failing. Can someone please let me know how?
petit beauté's user avatar
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Difference between change in momentum caused by a force and by kinetic energy

I don't see what the difference is between a momentum change caused by a force (eg: someone pushing against a metal ball) and and by transmission of kinetic energy (eg: a metal ball hitting another ...
Yann Debacker's user avatar
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5 answers
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Centripetal force pointing outward

What's going on physicists. I would like some explanation here. I haven't been satisfied with the ones I gathered on the internet. Here is it: If a particle moves in circular motion, there will be a ...
AhmedSahraoui's user avatar
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Good Physics Engine Recommendations [closed]

Basically, I am looking for a precise physics engine I can use to run tests and tune a PID controller. The simulation is relatively simple: a small rocket with air brakes reaching a target altitude. ...
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0 answers
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Why am I getting different equations in lagrangian and Newtonian [closed]

I wanted to solve for isotropic harmonic oscillator equation of motion. I am getting two different equations of motion, what's wrong with the lagrangian method?
ASHIS NAYAK's user avatar
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Doubt related to Pulley Constraints [closed]

I was solving this problem in which we have to determine the velocity with which the block of mass m ascends. Terminologies with reference to the diagram: Here $P_1, P_2$, and $P_3$ denote the three ...
Chetan's user avatar
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Conceptual doubt related to motion of two blocks on an incline

I was solving the following question: In the arrangement shown in the figure all surfaces are smooth. Select the correct alternative(s) (A) for any value of θ acceleration of A and B are equal (B) ...
Chetan's user avatar
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3 answers
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Is gravitational potential energy of body by $mgh$ negative? [closed]

Consider a 15kg object at 1m from earth ground level, is P.E = 15kg * 9.8m/s^2 * 1m = 147J or P.E = -Gm1m2/r^2 * h = -9.8 * 15kg * 1m= -147J after browsing for a while on debate of potential energy's ...
Neptotech -vishnu's user avatar
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3 answers
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Does A Pivot Exert A Force

On a frictionless horizontal table, a uniform stick is pivoted at its middle, and a ball collides elastically with one end, as shown in Fig. 8.10. During the collision, what are all the quantities ...
John Doe 's user avatar
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1 answer
55 views

Why particle is certain to escape the conservative field when the mechanical energy is positive?

It is generally said that the particle is bound into the conservative field when the mechanical energy is negative and zero is the limiting case and the particle will escape the field when the ...
Het Patel's user avatar
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1 answer
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Interesting Aerofoil Logical Fallacy

I am new to physics in general having just finished AP Mechanics and have limited knowledge of how fluid dynamics work. But just using forces and a simplified understanding of drag if have come to the ...
Frontiers Aerospace's user avatar
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2 answers
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Person holding two persons hanging over the edge and centre of mass inconsistency

Imagine a person holding the leg of the person in front that also holds the person in front of him. (over the edge like in MI4, assume centre of mass of second person with feet still on the floor is ...
LEXOR AI's user avatar
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2 answers
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Buoyancy basics

I was solving this question and in the solution, they have applied a buoyant force exerted by kerosene. It makes sense by the basic definition of the buoyant force from Archimedes principle. However, ...
Toshiv's user avatar
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0 answers
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Mechanics and constraint relation [closed]

Please solve this mechanics problem . I couldn't derive the relation of extension of cords
Ambuj Bind's user avatar
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22 views

Rope sliding from frictionless surface inconsistency [closed]

Imagine a rope that has a mass lying on a frictionless table and one part of it is hanging over the edge. I know that if there is no friction it does not matter how much of the rope is hanging over ...
LEXOR AI's user avatar
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Direction of friction of a block moving down a plane

Lets say that there is a block is on an incline, but given a horizontal push before being let go. Once the block is let go, friction will oppose the component of gravity acting along the ramp, $mg\sin(...
Emil Sriram's user avatar
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1 answer
94 views
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Why doesn't Car-Parrinello molecular dynamics require an SCF calculation?

Reading the various terms of the Lagrangian in Car–Parrinello molecular dynamics, I'm trying to understand why there is not an SCF procedure hidden there. In fact, it seems to me like the second term ...
Chemistry.'s user avatar
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3 answers
25 views

Would a homogeneous rod on a fulcrum oscillate or remain at rest after displacement?

If I take a homogeneous rod, put it on a fulcrum, push one side down in a controlled way and release very carefully won't the rod just stay at rest in that new position? ChatGPT says that it would ...
Matthias's user avatar
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A bird in a container [duplicate]

Suppose there is a bird in a sealed container, and the container is on a scale that measures its weight. The bird is flapping its wings to hover in the middle of the container. If the bird flaps its ...
Ebi's user avatar
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Find the height of water to be poured such that the centre of mass should be minimum height [closed]

Water is poured into a container of uniform mass distribution where its mass is 1kg,height of container is 100 cm and base area is 10cm2,density of water is 1gm/cm3 find the height of water to be ...
Dhruv's user avatar
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Force due to pressure on a curved surface/wall [closed]

Most solutions that I found on the internet concerning the net force due to pressure on a curved wall were using free-body diagrams and I could not find any using a calculus approach Assuming the ...
Toshiv's user avatar
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1 vote
2 answers
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Vertical Circular Motion ($u$ minimum)

In vertical circular motion, when we consider motion of a pendulum bob, while finding minimum velocity to complete VCM, we take Tension=0 at highest point and velocity at highest point is not equal to ...
Navs's user avatar
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2 answers
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Granular Material Piles on an Inclined Plane

Consider a conical pile of sand (or any other granular material) that is placed on a flat surface. This conical pile has a given radius and height (r and h, respectively). What would the effect be on ...
K.R.'s user avatar
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1 vote
3 answers
79 views

Conservation of linear vs. angular momentum in two similar cases

I have a question that eludes my understanding: Imagine we have a bullet of mass $m$ and a rigid pendulum with a bob of mass $M$ hanging from a rigid rod of negligible mass hanging from the ceiling ...
Giovanni Piacentini's user avatar
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Two cylinders rolling without slipping on planks

I am struggling with the following setup. This setup consists of three massless planks and two massive cylinders, as can be seen from the figure. The lower plank is pulled with a force $F$ that ...
Bml's user avatar
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3 answers
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A Force Perpendicular to the Velocity changes only the direction of motion? [duplicate]

Why does a force that remains perpendicular to velocity alaways only change the direction of the motion(circular) and not induce a velocity in the perpendicular direction???
Atharva Thakur's user avatar
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2 answers
65 views

How to understand gyroscopes by using vectors?

I’ve seen plenty of videos explaining how gyroscopes work, but almost non of them why they are constrained to work in such way. From seeing only angular momentum vectors, how could one predict ...
Alexander Djurovich's user avatar
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0 answers
32 views

The total horizontal distance traveled by a bouncing ball nudged off a table of height $H$ [closed]

Suppose a ball gently rolls off a flat surface of height $H$ and free falls to the ground subject only to the law of gravity. Once the ball hits the ground, it rebounds as shown in the figure. When ...
user42700's user avatar
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0 votes
2 answers
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What would happen to the moon's orbit if we reduce (instantaneously) its mass? [closed]

In my opinion the moon's orbit shouldn't change, because an orbiting body is a free falling object and the trajectory of a free falling object is not affected by its mass (because the inertial mass ...
Suppiluliuma's user avatar
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3 answers
80 views

Is the kinetic energy of a rotating system just the sum of the instantaneous kinetic energies of the individual particles?

Take a look at this construction which shows linearly moving particles giving the illusion of circular motion. (Follow the instructions on the screen). Now the question is when I calculate the total ...
KDP's user avatar
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-2 votes
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Force applied by hand, force applied by the spring and the corresponding work done

Consider a block of mass $m$ is attached to a massless spring of force constant $k$. If the spring is pulled by hand so that it stretches by an amount $x$, its potential energy increases from zero to $...
Solidification's user avatar
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2 answers
61 views

Some questions regarding a pulley [closed]

Please have a look at the following diagram sketched by my Professor. The points $P_1$ and $P_2$ have mass $m_1$ and $m_2$ respectively . The pulley is frictionless and it is represented by a ...
Davide Masi's user avatar
2 votes
1 answer
94 views

Mapping between generalized forces and external torque of a rigid body whose rotation is described by quaternion is not unique(?)

In this paper the mapping between generalized forces and external torques for a rigid body (when the rotation is described by a quaternion) is derived: $$\textit{F}_Q = 2\textbf{G}^TT'$$ where $\...
blenderman's user avatar
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0 answers
25 views

Find the tension in the string when the string is vertical [closed]

By using Work Energy Theorem, as well as Velocity of centre of mass, I succeeded in finding the velocities of both the ring as well as block. I noticed that there is going to be a vertical circular ...
Science Tard's user avatar
-1 votes
0 answers
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Distance traveled by a ball in a rotating rod [closed]

I have a mechanism here. there is a ball with mass m in a rod with mass M that it is pinned from one side, we release the rod, so it rotates. at the time when the rod is vertical, the ball has ...
Miumen's user avatar
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5 votes
2 answers
1k views

Why can we treat a ball as a point mass to calculate torque?

A sphere of radius $R$ is supported by a rope attached to a wall as shown in the below figure. The rope makes an angle $\theta$ with respect to the wall. The point where the rope is attached to the ...
Ryder Bergerud's user avatar

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