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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Minimum calculus for Lagrangian Mechanics [on hold]

I have noticed in my classical mechanical books, the development of the motions of equation for simple systems using the Lagrangian that the main complication, if doing the work by hand, is applying ...
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1answer
157 views

How does the math of storing energy in a spring work in a moving frame?

Consider a spring with spring constant $k$ attached at one end to a wall. When an external force stretches it by distance $l$ in the positive direction the force does work $\frac{1}{2}kl^2$ and that ...
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2answers
171 views

Experiment in dynamics/newton's laws

During my physics class the teacher demonstrated an experiment to us: The teacher said that if we pull the rope slowly than the rope will tear at connection A, but if we pull the rope instantly/with ...
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2answers
671 views

When I pull a rope attached to a block, does the rope OR the block pull me back? If so, with what force?

I am having a hard time understanding the tension force, especially when thinking about it at a molecular level. Suppose I have a rope attached to a block which is sitting on frictionless surface. ...
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1answer
63 views

Kinematics problem, only energy related approach [on hold]

I read this question: From the top of a tower, a stone is thrown up and it reaches the ground in time $t_1$. A second stone is thrown down with same speed and it reaches the ground in time $t_2$. A ...
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44 views

The origin of normal reaction

I want to know what actually is the origin of normal reaction between 2 objects. i have read about normal reaction from several books which generally mention it as a component of contact force which ...
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1answer
57 views

Distance between two drops

2 drops are thrown away simultaneously in $t=0$, with initial velocity of $v_i$ and in angle of $\theta_i$ in opposite directions as seen in the picture. What is the distance between them as a ...
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1answer
127 views

Motion of a car on a banked road

I have read about the motion of a car on a banked road. I read that the maximum possible speed of a car on a banked road is greater than that on a flat road. I know the formula for finding velocity ...
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2answers
608 views

Difference between the Coriolis effect and the Eötvös effect

The coriolis accelaration is $-2\Omega \times u$, where $\Omega$ is the earths rotation and u is the velocity in a basis following the earth. When something moves east/west, this results in ...
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1answer
513 views

General motion of a cone on an inclined surface

Suppose that a solid cone is placed horizontally on an inclined surface and is initially at rest. How will the cone move when it starts motion due to its weight? I know that its motion depends on the ...
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1answer
22 views

A Chain in Equilibrium

My By book says that, for equilibrium Limiting Friction$(f_L)$$=$Weight of hanging chain. But Why??
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3answers
820 views

Ball flying towards me - Newton's third law is violated?

I was trying to answer the question of the flying ball here on the basis of Newton's third law and momentum conservation. Here is what I have tried. Lets take a ball mass of $m_1$ (index 1 is the ...
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3answers
270 views

Magnus effect: Where is the energy coming from?

I am not an expert in Physics, so please go easy on me. The magnus effect creates a perpendicular force to the axis an object spins around and the velocity vector. But where does that energy come from?...
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22 views

Tension due to unequal forces on a massless spring [duplicate]

When a massless spring is pulled by 5N on both sides the tension in the spring is 5N (proved by considering COM at rest and breaking the spring into two springs of 2k each)...what if the forces ...
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1answer
79 views

Derivation of equation of motion for mechanical seismograph

Consider a simple seismograph consisting of a mass $M$ hung from a spring on a rigid framework attached to the earth, as shown in the picture. The motion of the mass is apparently described by the ...
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2answers
79 views

Can Newton's laws be reformulated with reference to “relative” frames

I was reading: https://arxiv.org/abs/1205.2326 page 2 which gives thorough discussion of the three laws. In particular there is a refutation of the (paraphrased) 2nd law implies the first because ...
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2answers
27 views

Is the net force on atomic/molecular constituents of a solid body zero

So my question is this that suppose we consider a solid everyday object, say a spherical stone. Now, if I consider an atom or a molecule of the stone away from the center of the stone, then I can say ...
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35 views

How to solve a general planet orbit differential equation? [on hold]

According to Newton's gravitation law, the following differential equation can be made $$\frac{d^{2}}{d t^{2}} \mathbf{x}{\left(t \right)} = - \frac{G M }{\left|{\mathbf{x}{\left(t \right)}}\right|^{...
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What do the terms “Frame specific work” and “Frame dependent work” mean? [on hold]

I was reading a paper published in A.J.Phy. American Journal of Physics 60, 356 (1992)[All About Work] by A. John Mallinckrodt and Harvey S. Leiff There I found this two terms but when tried to ...
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3answers
987 views

Thermodynamics and Newton's second law

Is it correct to say, that the Newton's laws (or a Newtonian system) is reversible if the friction isn't considered (the fact that the time is of second order $\frac{d^2x}{dt^2}$) and an isolated ...
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1answer
346 views

How does the viscosity of a fluid affect the angular speed and resultant force of a cylinder that is rolling?

*This is not a homework question - I'm taking the iB and need to understand how liquid properties affects certain variables of a cylinder for my Extended Essay. So basically, here's the scenario: ...
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2answers
50 views

Centre of mass of a solid cone using a symmetrical method [duplicate]

When we rotate a right angled triangle about its perpendicular we get a solid cone. For a right-angled triangle the centre of mass is at its centroid i.e., at $(\frac h3, \frac b3)$. If we consider a ...
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3answers
173 views

Total force on upper block in two block system

If a block $m$ is placed on another block $M$ and a force $F$ is applied on bolck $M$. Then how many forces are acting on block $m$.(Friction is non zero) The image is taken from this site. Is ...
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How to determine the direction of acceleration for block A and man? [on hold]

My confusion is how to determine the direction of acceleration of block and man. I know that in the same direction. acceleration of Man wrt rope/block will be Acceleration of Man minus Acceleration ...
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1answer
130 views

Setting up initial conditions of parabolic orbits, centre of mass frame

I am writing a simulation of 2 bodies in coplanar parabolic orbits in their centre of mass frame (in C++) and am having difficulties setting up the initial conditions for the velocities. The total ...
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4answers
404 views

Why didn't the glass break?

In the figure below, a needle has been placed in each end of a broomstick, the tips of the needles resting on the edges of filled wine glasses. The experimenter strikes the broomstick a swift and ...
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29 views

Determining whether I hit the bed when jumping from a cliff [on hold]

For simplicity, assume a perfectly spherical object with uniform density falling from some height to a lake. How can I determine whether I hit the bed of the lake? Maybe this has something to do with ...
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2answers
55 views

How to figure out the distribution of Normal Force on a body?

I was solving a problem and came across some confusion regarding the point of application of Normal Force. In Classical Mechanics 101, we had always treated the Normal Force as acting on a point (...
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1answer
41 views

Inverted pendulum, EOM

Consider the inverted pendulum shown below: where $F$ is an external force, $B$ is the CoM of the rod, $A$ is the position of the joint where the rod attaches to the car. Angles increase in the ...
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8answers
1k views

Why is acceleration variable in uniform circular motion?

Acceleration is the rate of change of velocity. In the uniform circular motion the acceleration is produced due to change of direction of the velocity(the magnitude remains same). The direction is ...
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2answers
76 views

Calculate escape velocity without using energy? [on hold]

Is it practically doable to calculate the escape velocity on the earth not by using the principle of energy conservation, but by calculating the velocity of the particle as a function of time using ...
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2answers
43 views

Can someone explain these circled points…?

Why is direction of friction in the direction of motion and here it is the platform that moves....the movement is not caused by friction so how is friction doing work? In the second one there is no ...
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1answer
18 views

Is there a fixed orientation of center of mass axis about which all unconstrained rigid bodies rotate?

I just learned that an unconstrained rigid body always rotates about its center of mass. But there could be many axes that could pass through the center of mass. For example, let's consider a rod ...
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33 views

How to find force from given torque and distance?

Let us assume that the rectangular board shown has a torque T at its centre of mass, due to which it is undergoing angular acceleration in clockwise direction. Let d be the distance from the centre of ...
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1answer
247 views

How radial component is positive and negative with respect to the direction in conical pendulum and rotor

These are the words from 3rd paragraph of Topic "The Conical Pendulum" in book Halliday Resnink Krane 5th-e "The radial component is negative if we define the radial direction to be positive outward ...
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28 views

What will be the equation of the path of spider? [on hold]

A cobweb thread of negligible relaxed length is traced between points A and B on two opposite walls as shown in the figure. In this state the thread makes an angle $\theta$ with the horizontal and ...
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2answers
269 views

Why does height affect bounce efficiency?

I recently conducted an experiment, where I dropped tennis balls from various heights and recorded their rebound heights. The higher the drop, the higher the rebound height, obviously. However, the ...
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${}$ A tug of war with different forces at each end of the rope [duplicate]

In tug of wars usually both the teams apply equal force on the rope resulting in the development of tension in the rope which is of the same magnitude as that of the applied force. But, now if one ...
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1answer
545 views

Based on newtons third law [closed]

If an elephant can apply 250N force and a rabbit can apply 25N force , and if they are pulling each other , then elephant will pull with 250N force and according to newtons third law the rabbit should ...
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33 views

A tug of war with different forces at each end of the rope [on hold]

If a man pulls a rope with a force of 150N towards him and the other end of the rope is pulled by a small girl with a force of 50N towards her. Assuming rope to be massless. Find tension in the string....
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25 views

Impulse and force; hammer and nail

When a large force acts for a very large time, is it still considered to be impulsive? If we drop a nail of 1 kg onto the floor from a height of 1 m, does it pierce the floor?
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Why can't the work done by a non-conservative force be zero?

Why can't the work done by a non-conservative force be zero? The displacement along a closed path is always zero. So, whatever be the type of force, variable or constant, the work has to be zero. Why ...
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Analysing a lift moving up with acceleration from the inertial frame of the ground

A frictionless inclined plane,making angle $ θ$ with the horizontal, of length $ L $ (inclined plane is a right-angled triangle, $ L$ is length of hypotenuse) is kept in a lift which is moving up with ...
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2answers
40 views

Mechanical energy conservation

Is the mechanical energy conserved when the speed is constant? What if we have a charge that entered an electric field due to an external force -which is making a dynamic equilibrium with the ...
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0answers
28 views

What are the underlying concepts in the Strength regime vs Gravity regime graph in Impact cratering? [closed]

So I am trying to write a research paper (about 3700 words) for high school about the topic in the title or something similar. I have found the following information which I am struggling to ...
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2answers
35 views

The reason behind circular motion of vehicles

In all the textbooks and internet resources that I've ever read , most of them explains role if friction in circular motion of an object (let's says a cycle), from the frame of the cyclist i.e. with ...
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2answers
35 views

Friction and Circular Motion

In circular motion, it is said that the friction acts towards the centre of the circular path. But friction opposes tendency of relative motion and since the velocity of the body(in circular motion) ...
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2answers
51 views

Buoyant force of tides and conservation of energy [duplicate]

Imagine an electric power generator in a form of a floating object moving up and down and utilizing the buoyant force of sea tides. Can anyone explain how it doesn't violate the principle of ...
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5answers
780 views

What is the effect of torque steering on a motorcycle with a long wheel base?

From experience, it appears motorcycles with a large wheelbase coupled with a long handlebar (say a modified Harley Ape Hangar) shows a noticeable tendency to veer to a side during acceleration vs a ...
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1answer
191 views

Proving the validity of the relativistic version of Newton's second equation

I want to verify the relativistic version of Newton's second equation $ F^\mu = m_0 A^\mu $ is true. My idea is that I expand both sides and compare the components. Left $$ F^\mu = \frac{dP^\mu}{d\...