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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Is it correct to say that it is theoretically impossible for perfect rigid bodies to exist?

If perfect rigid bodies were to exist then,consider a scenario in which two rigid bodies of equal masses moving with velocities of equal magnitude but opposite in direction colliding against one ...
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3 answers
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I am having a simple doubt in inertia

I don't know quantum mechanics and know a little bit about mechanics and a very little bit about subatomic particles but I am just a curious to know the answer to my question. My question is if '...
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2 answers
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Angular Momentum about a Point

I am confused by two different definitions of the angular momentum of a particle P about a moving point Q, with point O as the origin of the inertial frame. I learned the first definition from my ...
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2 answers
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Can an object move with a constant velocity without balanced forces?

Can an object move with a constant velocity without the balanced forces? As an object which is balanced with the frictional force continues moving at a constant velocity, acquired till then. How does ...
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2 votes
5 answers
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How does a sliding object stop moving by the effect of kinetic friction, if kinetic friction is constant and Fk can't be greater than Fapp on its own

The kinetic friction is constant. So if say, I apply a force of 20N on an object and the kinetic friction is 13N, then how does the object stop moving after some seconds. I believe that kinetic ...
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1 answer
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Moving body is collided with a spring system.Why there is a difference in maximum compressed distance for different observers?

Suppose a body of mass m moving with velocity collides with a spring system.The event is being observed by two observers, one at rest and one moving with a velocity v opposite direction to that of the ...
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How to find the force exerted by continuous jet of water on a wall? [closed]

Suppose, the water is flowing at a speed of $2m/s$. The cross-sectional area of the opening is $0.03m$, and the water is hitting the wall at right angles. Assuming the water doesn't rebound, how will ...
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1 answer
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Transfer mechanism of two particles in laboratory coordinate [closed]

There is two particles' collision with angles theta for M1 and phi for M2. The initial velocity of M1 is V0 and of M2 is 0. The collision follows the conservation of energy and momentum. Three ...
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Rolling without slipping on a curved surface [closed]

Here, we have a cylinder (centre B) rolling without slip on the rounded edge of a table. The rounded edge is a quarter circle centred A. Q is where the rounded edge meets the horizontal surface of the ...
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What is the action pair of normal reaction in case of bike riding along a curved vertical wall

I was reading about a situation in my brother’s physics textbook where a bike is riding along a curved vertical surface. It’s mentioned there that normal reaction provides the centripetal force and ...
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Its a physics exam question, I and my friend don't understand the theory and mechanics behind it.(Don't tell the answer, just need how to visualize) [closed]

Two spheres each of mass m are connected by string of length 2l, are kept on a smooth horizontal surface. A vertical force F is applied at the middle of the string. What is the max value of F for ...
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1 answer
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What is the work done by friction on a body from the perspective of different observers using the formula $-μmgl$?

Consider two observers moving with respect to each other at a speed $v$ along a straight line. They observe a block of mass $m$ moving a distance $l$ on a rough surface. The change in KE of the block ...
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1 answer
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Concept of work [closed]

How was the concept of work and energy invented in physics? What is the actual idea behind work and energy? Why are distance and force specifically used to define work, why not time instead of ...
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Find interval between scucessive conjunctions

The maths here doesn't seem to be too hard, but for some reason I can't quite figure out what to do: Consider two planets orbiting a star in circular orbits with periods $T_1$ and $T_2$. What is the ...
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The work done by tension and normal forces are conservative or non-conservative? Give reasons [duplicate]

The work done by tension and normal forces are conservative or non-conservative? Tension as well as normal forces does work but has no field. Simultaneously their work is not always path dependent. ...
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4 votes
7 answers
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Trying to understand Newton's Second Law [closed]

If I apply a force on an object at rest and it’s velocity is constant (after force is applied) wouldn’t that mean that the acceleration is 0? Then how would $F=Ma$ make sense? My thinking here is that ...
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Finding equation for acceleration of a mass connected to a massless spring [closed]

If a mass of $ 5$ kg connected to one end of a spring is released from the elongated position and its corresponding angular velocity is governed by the equation $ \omega =t^3+t^2+1 $ then what is its ...
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Gravity Differential Equations

I was just messing around with Newton's Law of gravitation, when I had the idea of converting Newton's Law into differential form (more or less like Maxwell's equations). I did the following: #1 ...
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1 answer
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Konig's Theorems

In the proof of Konig's Theorems the following identity is used: $$ \underline{v_i} = \underline{v_i'} + \underline{v_c} $$ which is the law of transformation of velocity when passing from the ...
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2 answers
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Maintaining the balance of a rod of uniform density

Assume a rod which: is of uniform density $\rho$. is a metre long. The rod is balanced on a knife edge at 58 cm. mark (in the notation where the extreme left side is assumed to be 0). To the extreme ...
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1 answer
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On general covariance

If newton's theory could be formulated in the language of differential geometry (symplectic manifolds), what do we really mean when we say that the theory is covariant under the Galilean group when it'...
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Linear pull vs pulling at an angle [duplicate]

Why it seems much easier to pull an object in the horizontal plane, by attaching the rope to a "non moveable" object and the object that we need to move, then lifting the rope in the middle. ...
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1 answer
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Extension in Massive Springs under gravity

Suppose we have a spring which has a uniform cross sectional area $A$, and has a uniform linear mass density $J$, and has a total unstretched length $L$. Let the spring also obey Hooke's Law. Further, ...
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How to create a friction-based cable exercise machine? [closed]

What would be the best mechanism to create a friction based cable machine? The point of this machine to only have resistance to movement not when the cable's stationary and without the momentum of ...
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0 answers
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How do I numerically calculate time it takes a car to travel along a predefined path?

How do I numerically calculate the time it takes a car to travel along a predefined path? Given these inputs: path as a set of points (x, y, plus curve radius at each point) car mass car max absolute ...
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0 answers
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Mechanics | Use the work-energy principle to find the speed of the book as it hits the floor [closed]

Problem A small book of mass $m$ is held on a rough straight desk lid which is inclined at an angle $\alpha$ to the horizontal, where $\tan\alpha=\frac34$. The book is released from rest at a distance ...
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Is it a pre-requisite for something to have constant mass to be a 'system' in Mechanics?

I deal sometimes with control volumes, and we have closed systems, in Newtonian mechanics we often just describe a 'system' without defining if it's closed or open, if we have a 'mass flow' such as a ...
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1 answer
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Can a center of mass frame be non-inertial?

If I have a system with particles moving with varying accelerations such that it's center of mass is moving with accelerations (there is a non-zero net force on the system (acting on one or all of the ...
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1 vote
2 answers
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Drawing spacetime diagrams assuming absolute time (page-6,Section 1.5, Schutz)

Suppose an observer $O$ uses the coordinates $t,x$ as above, and that another observer $\tilde{O}$ with coordinates $\tilde{t}, \tilde{x}$ is moving with velocity $v$ in the $x$ direction relative to $...
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1 answer
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Are time and length independent or can one be derived from the other?

In particular, the time coordinate $t$ can be choosen so that the mathematical expression of the physical laws reflects their inherent symmetries. Already Newton's first law then fixes the time rate ...
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-1 votes
1 answer
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The image contains the question. The image descriptions contains my DOUBT

When the charges are at the extreme positions, the velocities of both the charges will be zero. DOUBT : Can we say that the net force acting on both the charges at the extreme position is also equal ...
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1 vote
4 answers
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A problem Understanding how a two-body system of planets starts rotating around barycentre

Consider,We are Creating a Two-body system in free space,Where no other mass exists,Let's Take First Mass M1 and hold it,Now bring Second Mass M2,hold it up,Now we are giving a suddenly impulse To M1 ...
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-1 votes
1 answer
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How non-collinear forces balance each other?

In the system of parallel forces , all the forces are non-colinear. So how to they balance each other?. Here in this case a wooden plank is supported at its end by two supports. All the forces here ...
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1 answer
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Equation to tell if precession will happen?

So I have an seen the equation to calculate precession but it breaks down at when there is not sufficient angular momentum, for example if an object is not spinning we divide by zero and the ...
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0 answers
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Effective masses of spring-mass systems [duplicate]

It is known that the effective mass of the spring in this vertical spring-mass system(figure can be viewed by the following Wiki link) is 1/3 of the mass of the spring, for example, if the mass of ...
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Lagrangian and Newtonian Equations of motion with Atwood Machine [closed]

I just have one quick question. As these are simply different methods, are all results compatible? For example, if I find the acceleration of each of the three masses in the double Atwood machine ...
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-3 votes
4 answers
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Does this prove that the force and momentum formulas are wrong? [closed]

Imagine someone is pressing a cube with his thumb and index finger, and there is no motion in the system. Is the cube really under pressure? If the cube is under pressure, how we can justify that ...
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1 answer
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Why do equation of motion fail to apply in non-inertial frame even after applying pseudo force?

I considered two cars of equal mass moving towards each other with speed 30m/s and 18 m/s respectively and when they are 100 meters apart they both start de accelerating at 6m/s² each. So if we ...
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-2 votes
0 answers
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A bottle weights 4.5kg, what's its mass in TeV (Terra Electronvolts)? [closed]

I'm not entirely sure about this problem. And the second one says: An apple falls down from a height of 1 meter. What's it's kinetic energy? My thoughts: 1/2gt^2= 1 meter -> solve for t, then v=s/t ...
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1 answer
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The chronology of taking approximation changes the answer?

The problem is to find the time it takes a particle dropped from a height $h_0$ above the surface of the earth to reach the surface (exactly, not approximately i.e. $g$-value is not constant, in the ...
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0 votes
1 answer
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Strange kinematics result

I'm currently doing some algebra-based physics problem sets and have come across this strange result. Problem A ball is tossed upwards with an initial velocity $\vec{v}_0 = 48.9\text{ m/s}$. Assuming ...
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1 vote
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Motion of an $n$ mass $n$ spring system [closed]

While reading wave motion I encountered the problem of $n$ identical masses with $n$ identical springs in between them. If we give a sudden push to the wall attached to the first spring, what will ...
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3 answers
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How velocity affects different orbits?

Assume a sun with mass $M$ and a planet with mass $m$. Assume at $t_0$ the planet is $r_0$ (distance) away from sun and has an initial velocity of $v_0$. Also, let’s assume the angle between the $r_0$ ...
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2 answers
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What is the answer to this spring, pulley and mass system problem? [closed]

For the first point $x_{eq}=\frac{mg}{k}$ put regarding the second point, we need to get the differential equation, after using $F=ma$ we get $mg-kx=ma$, I considered that $x$ is equal to $x+x_{eq}$ ...
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Energy stored in an object in spring

Suppose we have a vertical spring of spring constant $k$ and an object of mass $m$ is tied to it. If we stretch the object by a distance $x$,the work done by the restoring force is $\frac{kx^2}{2}$ ...
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Program to generate graph of spring-mass-damper system

For a school project, I've been researching mass-spring-damper systems. For this I did an experiment in which I basically filmed a spring with a mass attached to it that went up and down and ...
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5 answers
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Question regarding kinetic energy of a body

Suppose you pushed a block very hard for a small interval of time. Then it traveled some distance 'S' and stops due to friction. You haven't applied force upto the 'S' distance. The force applied by ...
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2 votes
1 answer
49 views

Physics of tennis hit

If one takes notice the tennis players hit the ball on the right corner that way: Their last step before the hit is on the right foot, then they hit and then their left foot goes up in the air about ...
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-3 votes
0 answers
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Newton's Law of Gravitation - Inverse Square vs Cube Law [closed]

When calculating the location of gravitational equilibrium between earth and moon, it is found to be within 500km from the center of the moon. However, the same is found to be more sensible (72,000km ...
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1 vote
1 answer
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Will a radioactive ball conserve its angular velocity?

Consider a uniform spinning sphere in vacuum. In principle it should spin forever, because of angular momentum conservation. However, assume that the sphere is made of radioactive material: since it ...
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