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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 discussion of energy, momentum conservation etc., use classical-mechanics, for Newton’s description of gravity, use newtonian-gravity.

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Change of orbit with tangential impulse

I see a similar question: Change of orbit with a radial impulse. The answer to that question seems fine to me. In the answer, mention is made of this similar question, but it is not fully treated. ...
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Movement of an object tied to another

Suppose we have two objects $A$ and $B$, where $B$ is tied by a rope to $A$ with the slack pulled out, the initial tangential speed $c'(0)=(0,1)$ is perpendicular to $c(0)$ and $c(0) = (1,0)$, and ...
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Throw a ball AT a moving train, in what direction does it reflect?

You are standing at a platform, with a ball. a train approaches and u throw the ball at it in a straight line from a small distance. in what direction des the ball reflect off? heres what i think, ...
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Some questions concerning orbits of objects

I've been playing around with some physics problems and trying to figure out things by myself, mostly just for fun. I would appreciate if someone corrected my thoughts and gave me some feedback. I'm ...
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Force due to change in energy

We know change in kinetic energy is equal to total work done by all the forces acting on the object.For work done there should be a force .What's that force.direction? ex a parallel plate capicitor's ...
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$\Delta K=\Delta U$ vs $\Delta K = -\Delta U$

While doing physics homework, I noticed that in some problems, the change in kinetic energy(KE) is equal to the change in potential energy(PE), even though I learned that conservation of energy shows ...
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1answer
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Is Verlet method suitable for to solve projectile motion with quadratic drag?

Consider the following non-dimensional equations of projectile motion in presence of air resistance, I understand it can be numerically solved using the mid-point method, but can I also use Verlet ...
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1answer
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Tension in a string attached to a spring with deformation at a point

I am trying to calculate the tension in a string in the configuration shown in the diagram below. Here is a verbal description of the setup: The string is fixed at one end with the other end connected ...
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1answer
48 views

Projectile with air resistance from a given hight

Objects take same time to fall a given height independent of their horizontal speed when air resistance is ignored, is this also true when air resistance is not ignored? In presence of air resistance, ...
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1answer
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Why don't objects bounce infinitely?

I'm computer programmer, and I was making a little test of my “possibilities”, so to speak, so I made a small game with sort of gravity, bouncing ball and walls around. Recently I've noticed that ...
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1answer
29 views

Finding force on an object from newton's second law of motion

Imagine a body of mass "m" inside a box of mass "M".Let us assume that box is moving at a constant velocity.Then an observer from outside would see both the body and box moving. Let us now apply a ...
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1answer
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Where does 4N and 3N goes in this diagram?

Two forces of 3 N and 4 N are acting at a point such that the angle between them is 60 degrees. Find the resultant force. I successfully draw diagram for above sentence: But I am confused which one ...
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1answer
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Sign issue deriving SHM of Electric dipole in external uniform electric field

If we have an electric dipole as shown: Net torque on system = $Fdsin\theta$= Rate of change of angular momentum = $I \ddot \theta $ For small displacements along line of E field, $sin\theta \...
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1answer
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Is the total mechanical energy conserved in a system that's a simplifying approximation of an actual roller coaster?

Suppose you have a 2-dimensional Euclidean space where one dimension goes left and right and the other dimension goes up and down where one of the units of length is the meter. Furthermore, suppose ...
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1answer
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Forces on a railway track with curvature and cant (inclined plane)

I'm trying to work out the forces acting on the left and the right rail if the track has curvature and cant (i.e. is an inclined plane) I've come this far as you see in the picture but I'm struggling ...
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Extension as independent variable?

For a force extension graph of a spring to have extension on the $x$ axis means that you change the extension of the spring, and measure the force needed to do that? Why do these exist doesn’t it ...
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2answers
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How are objects able to move even after newton's third law of motion [duplicate]

I can't understand at all why objects move even though after newton's third law.I also have a doubt in following example If we apply a force on an object the object applies a backward push on us ...
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Is it possible to find the linear and angular forces?

Suppose an object has both linear an angular motion. Let's consider the object a sphere. What we know: - The angular velocity and acceleration - The linear acceleration of the center of mass. - The ...
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2answers
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Weighing machine, kg vs. N

When I stand on a weighing machine and it shows me the number 75 , is it my mass in Kg or the Normal Force due to gravity in N
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1answer
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Would conservation of angular momentum make it difficult to fall sideways in an O'Neill space colony?

It's always bothered me that the O'Neill space wheel puts forth centrifugal force as a suitable replacement for gravity. However, it seems the effects of conservation of angular momentum would induce ...
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Simple harmonic motion spring

A block of mass $m = 500 \text{ g}$ is attached to a horizontal spring with $k = 50 \text{ N/m}.$ At time $t = 0.1 \text{ s}$, the displacement $x = -0.2 \text{ m}$ and the velocity $ v = 0.5 \text{ m/...
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Overspeed Trip Valve Design

I want to estimate impact force generated due to collision between rotating body and stationary object. Bolt assembly is in balanced condition with the spring force and centrifugal force. As the speed ...
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If a box of mass $10$ $\text{kg}$ accelerates down a slope at $0.5$ $\frac{\text{m}}{\text{s}^2}$, what is the magnitude of the friction? [on hold]

If the box weighing $50$ $\text{kg}$ accelerates down a slope at $1.5$ $\frac{\text{m}}{\text{s}^2}$ then what is the magnitude of the friction acting on the box?
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Spring of mass m attached to a block of mass M [on hold]

What will be the time period of the object in the above case? I saw this link on wikipedia. I understood the derivation but they haven't given why they took u=vy/l. Why will there be a linear ...
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Centripetal Force on a compound system [on hold]

Here's the situation :- A small mass (m) is placed on a disc of mass 'M' which is rotating about its center of mass with some constant angular velocity. There is no slipping between the mass and the ...
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1answer
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Time period of a body moving under central force in a circle [on hold]

It is given that a body of mass m with non zero angular momentum L under influence of gravitational force . if area of particle's bound orbit is A then find out time period of revolution My approach ...
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What's the force when there is only mass? [on hold]

There is string of length $L$ , clamped at $x=0$ , and connected to spring-mass-damper system at $x=L$ . The force which spring-mass-damper system applies to ground is called bridge force. (This ...
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2answers
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Inertial frames as in Landau & Lifshhitz mechanics 1st chapter

If we see inertial frames from a basic point of view (precisely more basic axiom from which I can at least derive the law of free body as in landau mechanics first chapter) that inertial frames are ...
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1answer
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Frame uniformly moving to an inertial frame in Landau & Lifshitz mechanics

How to prove frame moving uniformly in straight line to an inertial frame is an inertial frame? (Assuming I do not know Galileo's relativity principle and Galileo's transformations and also taking an ...
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2answers
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Reaction force at a hinge [on hold]

I have a question about reaction forces when a body is hinged to a wall. See the picture for a random example I just plugged off the internet. When a mass is on a horizontal surface, the reaction ...
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1answer
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Radial component of velocity at extreme distances

Suppose I am given that a planet's position with respect to some star is of the form $\textbf{r} = r\textbf{e}_{r}$. Then of course $\textbf{v} = \dot{r}\textbf{e}_{r} + r\dot{\theta}\textbf{e}_{\...
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1answer
49 views

If a body is moving under central force in a circle then how its path will be changed if it is subjected to a impulse [on hold]

A particle of mass m moves under an attractive central force of $Kr^4$ with an angular momentum L Find the frequency of the radial oscillations if the particle is given a small radial impulse and ...
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1answer
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Conservation of Energy finding kinetic friction force [on hold]

a 10 kg block is released from rest and slides down a rough track AB and then continues to move on a frictionless horizontal track BC as shown in the figure. If the blocks speed at B is 6 m/s and the ...
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3answers
395 views

Calculating the moment of inertia of a uniform sphere [on hold]

Currently trying to calculate the moment of inertia of a uniform sphere, radius R, I know the answer is $\frac{2}{5}MR^2$ but I keep getting $\frac{1}{5}MR^2$ Setup: Assume mass per unit volume $\...
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5answers
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Couldn't you use a spring to increase energy?

When I was a kid I had a BB gun and when it was cocked it would compress a spring, then when you pulled the trigger, the spring would be released and fire a BB out at high velocity. I was thinking, ...
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2answers
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An object moves with constant acceleration. What would be the derivative of the unit velocity vector of that object with respect to time? [closed]

there was a question saying that: "An object is moving with constant acceleration a. which of the following are also constant?" (a) $$\frac{\text d\vert\vec v\vert}{\text dt}$$ (b) $$\vert\frac{\...
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Transverse vibration of triatomic molecule from Landau Mechanics Sec. 24

Transverse vibration of a triatomic molecule ABA which consists of two identical atom A and one another atom B such as $\mathrm{CO}_2$ is depicted in page 24 Sec. 24 Landau Mechanics. The ...
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1answer
51 views

System of spring blocks [closed]

Two identical blocks, each of mass 'm', are connected through a massless spring of spring constant 'k' . What will be the initial compression of spring so that on releasing the spring, lower block is ...
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3answers
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Calculate net force on the pendulum

In this image you can see a swinging pendulum and that there's a net force $A$ that causes it to move in circular motion. It is constantly updating velocity vector $v$ direction to be perpendicular ...
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2answers
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Trajectory of a satellite whose velocity is less than circular orbital velocity? [closed]

If the velocity of the satellite orbiting around a planet is reduced somehow...then what would it's trajectory looks like spiral(1) or elliptical(2) Or Does it depends on the  velocity it has(less ...
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3answers
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Friction when walking

To meet a U.S. Postal Service requirement, employees’ footwear must have a coefficient of static friction of 0.5 or more on a specified tile surface. A typical athletic shoe has a coefficient of ...
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1answer
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Why should Vector Components of a Weight be Perpendicular to each other?

So this question came to my head this morning. When analyzing such a problem, its easier to break the W component into 2 seperate components, here I've marked the components in Red & Pink arrows. ...
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1answer
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Can $\mu R = \frac{mv^2}{r}$ be used to approximate the maximum speed of a car around a corner?

My reasoning as to why this could be used to approximate the maximum speed of a car around a corner is because; $\frac{mv^2}{r}$ is the centripetal force of the car. The force to overcome this ...
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1answer
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The work due to friction given an influential force

Statement: I am trying to work through Chapter 8, Problem #70 of OpenStax University Physics Volume 1 and I cannot figure out what I'm doing wrong. The problem statement is as follows: A particle of ...
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2answers
62 views

Simulation software to solve high school level mechanics problems

I'm a physics teacher and I would like to find a simulation software that could be used to give exact numerical answers to high school level problems in Newtonian mechanics. I want the students to ...
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4answers
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What is the proof of parallelogram law of vector additon?

I have a question. How force can be defined as the magnitude of a ray? For instance, when we deal with two forces having magnitude 4 N and 5 N working 60 degree apart we solve the resultant by simple ...
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1answer
36 views

A peg moving on a ring [closed]

A thin but rigid semicircular wire frame of radius r is hinged at O and can rotate in its own vertical plane. A smooth peg P starts from O and moves horizontally with constant speed v0, lifting the ...
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2answers
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Apparent work energy paradox

The diagram shows a block of mass M with two rocket engines of negligible mass attached to it (pointed in opposite directions) and producing 5N of thrust each. Consider two cases where the mass is ...
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1answer
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Newton's Laws of Motion - Two spheres in a cup [closed]

This is the question I got really confused over: I tried drawing the free body diagram of the sphere on the left. Now if we let the angle between the vertical plane and $N_1$ be $\theta$, this ...
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1answer
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Problem regarding friction

I require a clarification on some steps in the solution of the following problem. Problem: The coefficient of static friction between two blocks shown in figure is μ and the table is smooth.What ...