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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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Toppling of a cylinder moving on a trolley

A uniform $2$ kg cylinder rests on a trolley. The coefficient of static friction between the cylinder and trolley is $0.5$. If the cylinder is $4$ cm in diameter and $10$ cm in height, what is the ...
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Can you derive the Tsiolkovsky rocket equation without calculus?

Can you derive the Tsiolkovsky rocket equation without calculus?
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Question about a crate in an accelerating truck and friction force

"A crate is sitting in the center of the back of a flatbed truck. As the truck accelerates to the east, the crate moves with it, not sliding on the bed of the truck. In what direction is the friction ...
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What are the necessary conditions for relative angular velocity to be defined?

I have certain doubts related to the definition of relative angular velocity .My textbook defines it in the manner given below:- $$\omega_{AB}=\frac{v_{AB}}{r_{AB}}$$ $\omega_{AB}$ is the relative ...
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Work-kinetic energy theorem for time-dependent force

Does the work-kinetic energy theorem hold in all the cases? Specifically is true for a time-dependent force?
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The physics of airplane flight

Physics in schools teaches two contradictory and mutually exclusive things: (1) That the upward lift force on an airplane in flight equal its weight (Lift = Weight = mass x gravity). This is based on ...
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Using Kinematic Equations when acceleration is not constant due to drag force

If you drop a ball in a vat of oil with a mass of 50 g and it reaches terminal velocity of 0.032 m/s, how long would it take to reach 1/2 of terminal velocity? The drag force equals $F_d$ = Dv. I ...
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What's wrong with my work? (calculate spring stiffness constant) [on hold]

So the prompt is as follows: A 1100 kg car moving on a horizontal surface has speed v = 65 km/h when it strikes a horizontal coiled spring and is brought to rest in a distance of 2.3 m. What ...
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How to find moment of inertia about centriodal axis in easiest way?

Actual question is Find the moment of Inertia of the cross-sectional area of an I section about its centroidal axis: My solution: Here $A_{1}, A_{2}$ and $A_{3}$ are the areas: Centriod at X axis;...
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Wrong position in spring-mass system [on hold]

I'm modulating a spring- mass system with gravitation and aero drag, with python programming. The spring is hanging vertically and attached a weight. The user then selects a length to draw it down ...
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1answer
453 views

Why does the Coriolis force appear when deriving the forces on a particle in polar coordinates?

I considered a particle in polar coordinates, $(r,\theta)$, with mass $m$. The standard basis vectors in polar coordinates are: $$\mathbf{\hat{r}}=\cos{\theta}\mathbf{\hat{x}}+\sin{\theta}\mathbf{\hat{...
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Why is the onboard trip shorter when riding on a relativistic rocket as compared to a Newtonian rocket? [duplicate]

In the top answer for this question on the Space Exploration StackExchange, it's calculated that a rocket traveling at constant 1g of acceleration over 100,000 light years would, under Newtonian ...
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Why do the inner tyres of a vehicle rise when taking a turn at high speeds?

When a person cycles at high speed on a turn, his body bends inwards, to raise the horizontal component of the normal reaction to provide the centripetal force for the turn. The more the speed is, ...
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1answer
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Can we move without moving? [duplicate]

So here is the question, If I jump and hover over the ground for sometime why don't we move away from the point I jumped from? Because earth is rotating so if I hover long enough we should move from ...
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3answers
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Work associated with pseudo force

In a non inertial frame if I want to apply the Newton's laws of motion one would use the help of pseudo force but in non inertial frame if I try to apply the work energy theorem should I consider the ...
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1answer
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The maximum height reached is [on hold]

In this question below  The maximum height which is being asked is the max height achieved from that elevated point A right? Because the formula which we have used just tells when the velocity of the ...
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4answers
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Is Newton's third law really correct? [on hold]

Suppose I am pushing a box on table with $10$ N force due to friction it is not moving and if i applied $20$ N the box started accelerating. Then, how does the box apply $20$ N force on me?Well ...
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Why does a force divide equally on multiple supports/legs?

Imagine a bridge spanning across two pillars/supports with a weight of $80N$. {Any external forces affecting the system are assumed to be negligible.} We know that the force exerted on these 2 ...
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2answers
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Classically, how would an electron orbiting a proton in a perfectly circular orbit emit photons? [duplicate]

Obviously, with quantum mechanics, we know particles don't really orbit in electric fields. From what I know, clasically, Bremsstrahlung radiation would occur if an electron was deflected or ...
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In which direction does the impulse acts on ball when we throw it to ground?

When we throw a ball to the ground then in which direction does the impulse acts on the ball?
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How to solve wedge block problems considering velocity of block in ground reference frame [on hold]

How to solve this question considering velocity of block directly into ground reference frame I have already solved it considering. Velocity of block in wedge reference frame
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1answer
37 views

An example of Newton's Third Law

I understand that Newton's Third Law applies to throwing an axe, but I can't draw what force is applied to what. If I was to bring back the axe to the top of my head, am I applying a force to the axe?...
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Would a fluid in free-fall exert a buoyant force on an object submerged in it

I’m not sure I 100% understand the buoyant force on the atomic scale. I know the force is due to pressure exerted on the object, due to the volume of the fluid that the object displaces. I’m under the ...
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1answer
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Why can shade-balls behave as quick sand?

So I came across this interesting video in which shade-balls were dropped into a swimming pool and people tried to swim around. Towards the end of the video, a smaller part of the pool is filled with ...
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Does accelerating for a given distance take more energy in a Newtonian or relativistic model?

This answer gives a pretty unintuitive result. Apparently, acelerating at a constant rate without a speed limit takes longer (from the frame of reference of the traveler) than accelerating with one. I ...
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1answer
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What is the difference between reciprocating and oscillating motion? How is reciprocating motion different from simple harmonic motion?

I wanted a good explanation for the difference between reciprocation and sinusoidal motion (For e.g. SHM). This question has been posted here due to many ambiguous and unclear explanations round the ...
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What happens If a uniform center-pointing force is applied on ALL angles on a sphere? [on hold]

What happens If a uniform, center-pointing, constant force is applied on ALL angles on a sphere? i.e The force is applied on the entire surface area of the sphere. Will it start spinning? If so then ...
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4answers
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Why we can't jump without bending our knees?

I observed it while trying to jump from my bed with my knees straightened and I failed to do it. I want to ask whether it is with all of us our it may be a medical issue with me? Why we can't jump ...
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physics,finding result by transforming equations [on hold]

The football ball m=1kg was kicked up vertically with speed v=30m/s. Make the model of movement track, also the graph of speed, knowing that Fr=bv2 , b=1 N/m2
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2answers
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Basics of simple harmonic motion

I was told in my class that simple harmonic motion (SHM) describes the motion of the projection onto a straight line of the motion of a particle undergoing uniform circular motion (i.e. with constant ...
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1answer
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Effect of air resistance of the period of a pendulum [duplicate]

Does air resistance increase or decrease the period of a simple pendulum?
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4answers
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How is linear momentum conserved in circular motion?

Consider a system of two charged particles ($+\text{ve}$ and $-\text{ve}$). Let's assume that the negatively charged particle revolves around the positively charged particle due to the force of ...
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1answer
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What is tension in cabel of elevator? [on hold]

A block of mass $m$ is kept on the floor of an elevator of mass $M$ and the system is accelerating upward with acceleration $a$. The acceleration due to gravity is $g$. $F_n$ is Normal force on Block. ...
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3answers
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The normal force in an elevator that's accelerating

I read a problem about a person is standing on a scale in an elevator. When I read the answer, there was an explanation saying that when the acceleration of the elevator goes upward, the normal force ...
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1answer
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An aircraft executes a horizontal loop at a speed of 720 km/h with its wings banked at 15°. What is the radius of the loop?

Though I solved the question as in the image: Solution: Taking Normal force on aircraft as N. $$\begin{array} {l}{N \cos \theta=m g, \quad N \sin \theta=\frac{m v^2}{R}} \end{array}$$ which gives ...
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How can a flywheel make engine run smoothly?

In the video Moment of Inertia Demo, a man states that moment of inertia will be higher if the masses are away from the axis of rotation. The engine take more power to spin the flywheel, because of ...
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If a particle can exert a force on itself,then can we define a whole lot of newtonian mechanics corresponding to it?

I think that it may be a broad question to be answered but if small amount of discussion is possible then it would be very helpful for all of us. Basically,I asked a question on this website a few ...
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Can the laws of mechanics be framed without invoking coordinate systems? [duplicate]

To a mathematician a vector is a geometrical entity in space that can be defined perfectly well without establishing up a set of x,y,z,t axies. In other words, mathematically we can work with vectors ...
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Why is the weight multiplied by 2 and not one for this moment question?

Hi, I have my physics gcse tomorrow and in my CGP guide, to find the anti-clockwise moment they multiplied the weight by 2 and not one even tho it says 1m on the right of the pivot, is this due to the ...
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1answer
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Rotation as an example of symmetry in classical mechanics

I modified the question because it was confused. On my book there is this mathematical definition of symmetry transformation: "The equations of motion have a symmetry, if the solutions of the ...
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0answers
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Why scooters have short wheels? [on hold]

Is there any physics behind the manufacturing of short wheels of scooters or is it just fashion?
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1answer
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Elastic potential energy

Elastic potential energy derivation For a string ...
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1answer
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Why is it easier to ride a bicycle than to run? [duplicate]

While it is very hard and energy-consuming to run a marathon, covering the same distance by bike is doable by most people. Where exactly does the gain come from? Assuming for simplicity that we are ...
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1answer
61 views

An ice cube orbiting the Earth

Recently I am stuck with a question about an ice cube that is orbiting the earth from a certain radius and it starts to melt down by the sun. Which of the followings are wrong? The cube will start ...
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1answer
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Theoretically, if you could attach a 1 meter string with a weight on the end to the exact center of the earth what would it do? [closed]

Would the mass of the weight keep moving towards the center but overshoot and repeat the process?
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5answers
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What is the reason for Moon and satellite in free fall condition?

I am a high school student. I read in my book that moon and satellite are in free fall condition with Earth. I asked my teachers about this, but I'm not able to understand. Can anyone explain to me ...
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1answer
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An error in a physics documentary?

I was watching The Amazing World Of Gravity (Full Physics Documentary) | Spark on Youtube, and I didn't quite understand a certain part. From 5:00 to 9:00, Professor Jim Al-Khalili was recreating ...
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5answers
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Rolling object not stopping even when friction is considered

I am dealing with a question that has me puzzled. Suppose an object which is rolling on a horizontal plane, with initial linear velocity $v=v_0$ and angular velocity $\Omega=\Omega_0$. There is ...
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A particle of mass $M$ decays into two particles of mass $m_{1}$ and $m_{2}$ [closed]

I can't understand how to get what the problems asks for: A particle of mass M decays into two particles of mass $m_{1}$ and $m_{2}$. A detector measures your energies and moments like this: $$E_{1} =...
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At what amplitude is maximum tension produced? [closed]

While I was studying angular SHM, a question struck me. Suppose there were two masses $m$ connected by a light rod at a distance $\frac{l}{2}$ from the centre of the light rod. If the centre of the ...