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 ...
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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 ...
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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 ...
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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 ...
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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 ...
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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 ...
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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-...
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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 ...
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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 ...
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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 ...
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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 ...
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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 ...
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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, ...
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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 ...
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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?
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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 ...
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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 ...
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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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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?
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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 ...
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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) ...
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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 ...
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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 ...
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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 ...
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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 ...
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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 ...
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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, ...
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Mechanics and constraint relation [closed]

Please solve this mechanics problem . I couldn't derive the relation of extension of cords
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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 ...
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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, $mg\sin(... 2 votes 1 answer 94 views +50 Why doesn't Car-Parrinello molecular dynamics require an SCF calculation? Reading the various terms of the Lagrangian in Car–Parrinello molecular dynamics, I'm trying to understand why there is not an SCF procedure hidden there. In fact, it seems to me like the second term ... 0 votes 3 answers 25 views Would a homogeneous rod on a fulcrum oscillate or remain at rest after displacement? If I take a homogeneous rod, put it on a fulcrum, push one side down in a controlled way and release very carefully won't the rod just stay at rest in that new position? ChatGPT says that it would ... • 13 0 votes 0 answers 43 views A bird in a container [duplicate] Suppose there is a bird in a sealed container, and the container is on a scale that measures its weight. The bird is flapping its wings to hover in the middle of the container. If the bird flaps its ... • 1,148 -2 votes 0 answers 21 views Find the height of water to be poured such that the centre of mass should be minimum height [closed] Water is poured into a container of uniform mass distribution where its mass is 1kg,height of container is 100 cm and base area is 10cm2,density of water is 1gm/cm3 find the height of water to be ... 0 votes 0 answers 24 views Force due to pressure on a curved surface/wall [closed] Most solutions that I found on the internet concerning the net force due to pressure on a curved wall were using free-body diagrams and I could not find any using a calculus approach Assuming the ... • 19 1 vote 2 answers 43 views Vertical Circular Motion ($u$minimum) In vertical circular motion, when we consider motion of a pendulum bob, while finding minimum velocity to complete VCM, we take Tension=0 at highest point and velocity at highest point is not equal to ... • 13 0 votes 2 answers 23 views Granular Material Piles on an Inclined Plane Consider a conical pile of sand (or any other granular material) that is placed on a flat surface. This conical pile has a given radius and height (r and h, respectively). What would the effect be on ... • 1 1 vote 3 answers 79 views Conservation of linear vs. angular momentum in two similar cases I have a question that eludes my understanding: Imagine we have a bullet of mass$m$and a rigid pendulum with a bob of mass$M$hanging from a rigid rod of negligible mass hanging from the ceiling ... 0 votes 0 answers 34 views Two cylinders rolling without slipping on planks I am struggling with the following setup. This setup consists of three massless planks and two massive cylinders, as can be seen from the figure. The lower plank is pulled with a force$F$that ... • 439 0 votes 3 answers 73 views A Force Perpendicular to the Velocity changes only the direction of motion? [duplicate] Why does a force that remains perpendicular to velocity alaways only change the direction of the motion(circular) and not induce a velocity in the perpendicular direction??? 0 votes 2 answers 65 views How to understand gyroscopes by using vectors? I’ve seen plenty of videos explaining how gyroscopes work, but almost non of them why they are constrained to work in such way. From seeing only angular momentum vectors, how could one predict ... 0 votes 0 answers 32 views The total horizontal distance traveled by a bouncing ball nudged off a table of height$H$[closed] Suppose a ball gently rolls off a flat surface of height$H$and free falls to the ground subject only to the law of gravity. Once the ball hits the ground, it rebounds as shown in the figure. When ... • 101 0 votes 2 answers 85 views What would happen to the moon's orbit if we reduce (instantaneously) its mass? [closed] In my opinion the moon's orbit shouldn't change, because an orbiting body is a free falling object and the trajectory of a free falling object is not affected by its mass (because the inertial mass ... 0 votes 3 answers 80 views Is the kinetic energy of a rotating system just the sum of the instantaneous kinetic energies of the individual particles? Take a look at this construction which shows linearly moving particles giving the illusion of circular motion. (Follow the instructions on the screen). Now the question is when I calculate the total ... • 6,217 -2 votes 0 answers 54 views Force applied by hand, force applied by the spring and the corresponding work done Consider a block of mass$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$, its potential energy increases from zero to$...
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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 ...