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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23 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
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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
42 views

Buoyant force of tides and conservation of energy

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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1answer
20 views

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

I was solving a problem and came across some confusion. In Classical Mechanics 101, we have always treated the Normal Force as acting on a point, and it was calculated by applying Newton's Laws (...
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1answer
27 views

Isn't inertia experience by person in moving bus is Torque

When a bus moves suddenly, the person standing in it tilts backwards. This concept is explained using inertia (tendency of body to resist change in its state of motion) but when the bus moves suddenly,...
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1answer
56 views

Calculate escape velocity without using energy?

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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The problem was found in the book of mechanics by Kleppner and Kolenkow [on hold]

If you start a coin rolling on a table with care, you can make it roll in a circle. The coin leans inward, with axis tilted. The radius of the coin is 'b' the radius of the circle it follows is R and ...
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Angular velocity in body frame

I am reading about IMU and getting confused in term "angular velocity of body frame with respect to Inertial frame introduced in body frame". It is said in text it is measured by IMU. If someone ...
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34 views

A bead of mass moves with constant speed $v$ along a thin and smooth wire bent to form a curve defined as $y=(0.5/m)x^2$ [on hold]

A bead of mass $m$ moves with constant speed $v'$ along a thin and smooth wire bent to form a curve defined as y=(0.5 m^-1)x^2.The wire lies in horizontal plane.The impulse imparted on the bead while ...
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0answers
22 views

Work and gravitational potential energy in taking a book in different definition of “system”

Can some body calculate the work done by person A in moving the book to height $h$ from ground in following three definitions of the system, where initaiial and final velocities are zero: a) only ...
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1answer
39 views

Coriolis force versus other effects that deflect an objects falling on earth from its vertical path

I am studying accelerating reference frames and I have solved the famous problem of finding how the Coriolis force deflects the trajectory of a falling object on Earth, the answer being $$ x_{east} = ...
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gate 1996 (mech engg) problem number 2.6 solution steps [on hold]

kindly discuss the problem 2.6 of GATE 1996 (Mechanical Engineering) exam (India). how to approach and what would be the steps. thanks in advance
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1answer
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Will arrow from traditional longbow will be dangerous if it is falling from above?

Let's imagine commonly seen in movies and video games "rain of arrows". Archers shoot up to hit enemies behind the obstacles, for example. As Brittanica states: “The best longbows were made of ...
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3answers
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On the Coriolis effect and weather

I learned in classical mechanics that the Coriolis Effect curves everything with speed to the right in the northern hemisphere and to the left in the southern hemisphere, my question is then why ...
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0answers
27 views

Tension. Forces [duplicate]

Suppose I pull molecule A of a rope then it also pulls me back by newtons 3rd law. The force that I applied on the rope caused tension in the string , but then what is the effect of the force which ...
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2answers
58 views

Will momentum be conserved in case of electrostatic force?

If a charged particle approached another particle of same charge held by some external force, then by coulomb's law the particle will start electrostatic repulsion. Thus coming to a closest distance ...
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Verify Conservation of energy for variable gravitational field [duplicate]

Remember we can verify conversation of energy in gravitational field when we take g to be constant When we leave body from H At a point h As potential energy is mgH -mgh Kinetic energy. ...
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1answer
68 views

Verify conservation of energy in gravitational field [on hold]

Remember we can verify conversation of energy in gravitational field when we take $g$ to be constant When we leave body from $H$ At a point $h$ As potential energy is $mgH -mgh$ Kinetic energy $=mv^...
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How to solve the following problem of particle dynamics involving Hooke's law? [on hold]

I cannot solve the problem below: A particle hangs at rest at the end of an elastic string whose unstretched length is $a$. In the position of equilibrium,the length of the string is $b$ and $2\pi/...
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34 views

Motion in Uniform Magnetic Field

Sorry for asking an exercise question here, but I'm really having difficulty figuring this one out. Quick summary of the problem: a charged particle moving in a uniform magnetic field will experience ...
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1answer
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Newton's laws of motion tension

I am very much confused about tension. I have even Googled my doubts (Also used khan academy) to clear my doubts but even there explanation couldn't satisfy me. PLEASE SOLVE THIS QUERY:- what ...
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43 views

A tough integration based problem [on hold]

A massless rope is tossed over a wooden dowel of radius $r$ in order to lift a heavy object of weight $W$ off the floor. The coefficient of sliding friction between the rope and the dowel is $\mu$. ...
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25 views

The dominance of Gravity vs Strength and its dependency on crater size [on hold]

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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1answer
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A doubt in a question of mechanics [on hold]

Question: A mass of 2 kg is when kept on a ground,the ground yields steadily and the block goes down with an acceleration of 1 $m/s^2$. Find the reaction force on the block by the ground. I know ...
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1answer
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Newtons laws of motion. Tension force

What is the difference between tension and the force that we apply externally. Also when we apply force externally let's say on moleculeA ( connected to other molecules through springs) then by newton ...
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Circular Motion and Force [on hold]

The maximum breaking strength of a piece of cord is 250 N. What is the maximum rpm at which the line can retain a 3 kg mass swung in a 1.8 m radius circle?
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31 views

Why does the wind close doors?

Assume you have two rooms, both with holes in the wall (more commonly known as open windows), which connect each room to the exterior. The two rooms are connected, but the connection can be closed by ...
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1answer
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If $v_{contact,road}$ in rolling motion is zero, how the contact point still manages to move forward? [duplicate]

If velocity of contact point of a rigid body performing rolling motion w.r.t road is zero then how the point gets delocalised from its initial position after some time? My textbook says, At any ...
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5answers
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Sum of gravitational force $W$ and contact force $N$ on a book at rest on table is not 0

There is a book on the table fixed rigidly to the earth. The book is at rest with respect to the earth. The acceleration of this book with respect to the earth is 0. The forces on this book are a) ...
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2answers
38 views

Is Kinetic energy always conserved in an elastic collision/impact?

While working out through some problems I encountered this problem : A ball moving with a velocity $v$ hits a massive wall moving towards the ball with a velocity $u$. An elastic impact lasts for ...
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What are three predictions of quantum mechanics? [on hold]

Specifically discussing the phenomenon of photons traveling through polarizers, what predictions are made by quantum mechanics?Bell’s theorem says “No physical theory of local Hidden Variables can ...
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34 views

Reactionless drive [on hold]

When pushing (or pulling) against a spinning mass you encounter more resistance than pushing (or pulling) against the same mass when it is still. Imagine a system with two articulated arms where: 1. ...
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2answers
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Why can I not draw with a pencil on my hand, while a pen works perfectly?

As far as my understanding goes, a pencil is able to write on paper, because of friction, bits of graphite re scrapped of from the lead. But then why is it that it doesn't work on my hand?? A hand is ...
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33 views

Find the maximum amplitude of oscillation of the spring mass system [on hold]

A platform of mass m is supported by a spring of force constant k as shown. When the platform is slightly pressed and released, it performs simple harmonic motion. Find the maximum amplitude of ...
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1answer
34 views

What's wrong in my approach towards solving this problem?

This is the problem that I have to solve: The figure shows a block $A$ of mass $6m$ having a smooth semicircular grove of radius $a$ placed on a smooth horizontal surface. A block $B$ of mass $m$ ...
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1answer
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Is an epoch-based approach valid for modeling $N$-body systems?

Consider a 3-body Newtonian system with equal masses such that velocity change at a given time epoch for a single body is given by: I am interpreting that if $\vec{R_2}$ and $\vec{R_3}$ also change ...
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1answer
28 views

$\mu_k$ of surface from experimental vs theoretical acceleration [on hold]

I have an air track at a slight angle with a glider. Final velocity is determined, and from that a is calculated, and from a, I have approximated g. I am trying to find $\mu_{k}$ between the track and ...
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0answers
28 views

Linear and rotational forces [on hold]

Given a solid body accelerated by gravity, in contact with a cylinder of radius $r$, whose axis cannot translate, how to account for the forces acting on both? Assume the mass of the solid is 1 kg ...
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3answers
90 views

Why are you doing no work when carrying a body through a horizontal distance?

Work done on an object is equal to $$FD\cos(\mathrm{angle}).$$ So, naturally, if you lift a book from the floor on top of the table you do work on it since you are applying a force through a distance....
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Free body diagram [duplicate]

I was reading about the ABS brakes and the articles say the wheels don't slide on the floor and the tire friction is static. but what would the force diagram of a tire look like under ABS? Wouldn't ...
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Does quantum mechanics say that the mind is the creator of the illusion of material reality? [duplicate]

I found this article from Richard Conn Henry, being an Academy Professor of Physics and Astronomy at Johns Hopkins University. I just don't understand this. Does quantum mechanics really without a ...
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2answers
39 views

Strategy for a person throwing an object in zero G to maximize a velocity

If an astronaut is drifting away from a space station holding a wrench, they could throw it in the opposite direction in an attempt to get back. But if they do it wrong, they will only end up ...
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3answers
65 views

How do we predict the motion of this systems using Newton's laws of Motion?

This question should be seen as an argument for these Answers. I want you to read the answers to this following question before answering it. Violating Newtons First Law! Here Everybody is saying CM ...
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1answer
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How does forward motion affect downward impact forces?

I like to skateboard fairly regularly and am also an avid watcher of the sport. Earlier I was watching this video where a skateboarder tears his MCL on a landing down an enormous drop. However, after ...
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1answer
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Does density of an object affects the difficulty in lifting it?

Isn't it that the only thing which affects its lifting difficulty is its mass ? For eg:- There is 1Kg of iron and 1Kg of cotton. Is it difficult to lift iron than the cotton due to higher density of ...
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0answers
30 views

How hard is it to lift a car? [duplicate]

You have a car and would like to lift one side (so that two of the wheels don't lay on the ground). How hard would that be? I am talking about a car close to the average dimensions: 1200kg, 4m20(...
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2answers
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Why can I use conservation of momentum to understand a bag getting dropped on a moving truck, if the ground provides an external force?

Please help me with this sat question from released test A toy truck with a mass of $0.6$ kg initially coasts horizontally at a speed of $2$ meters per second. A child drops a beanbag with a mass ...
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3answers
68 views

Why am I getting a negative sign in this derivation?

I want to derive a formula for calculating the final velocity of an object that falls from rest as it reaches the surface of the Earth. I want to take the change in acceleration into account and hence ...
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2answers
93 views

Why does a car which decelerates slowly on a icy road not slip but a car which decelerates quickly does?

Why is it that braking slowly on an icy road is safer than braking quickly. Intuitively it makes sense but what is the logic?
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2answers
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Constrained motion of the vertices of a quadrilateral

There is this square of side length $a$. It's opposite vertices are being pulled in opposite directions with a constant velocity $u$. The question here is what is the velocity of the remaining pair of ...