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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Ball on a string

A ball is attached to a string on a pole (i.e. Totem Tennis). If you hit the ball harder tangentially and horizontally, what will happen to the centripetal force, velocity and radius? Intuitively it ...
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Rotational Equilibrium of a Rotating Titled Rod about a Vertical Axis

Consider: Here a rod AB is rotating about a vertical axis with a constant angular velocity and is supposed to not fall down but maintain its angle with the vertical axis. Here the point of suspension ...
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Question Regarding the conservation of momentum in an inelastic collision of two rods

I am tasked with solving this question but am facing some intuition difficulty. consider this system: The empty circle signifies a nail that is stuck in the wall. I am unsure if there is conversion ...
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Cannon sliding an inclined plane

A classical question but seems I get is wrong. A cannon is sliding an inclined plane. As some point (where we cannon speed is $v_0$ downwards) it shoots a missile horizontally with speed $v$. What ...
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1answer
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Net Force vs Net Work

I hope you are doing well :) When I was practicing, I came upon this question: On a horizontal frictionless surface there is a Spring with a Spring constant is 50 N/m. Initially, the spring is at its ...
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4answers
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The effect of windspeed on a car

I've worked problems in the past in trig class concerning the effect of wind on the speed of a plane and it's flight path and was wondering if a similar thing occurs with a car. First off, I'm ...
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The formula of friction

So I had a question regarding the formula of frictional force (which is $F=\mu N$ where $\mu$ is the coefficient of friction and $N$ is the normal force b/w the objects and $F$ is the frictional force)...
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Problem regarding components of forces in conical pendulum

For the motion of conical pendulum we can write equations as $$T_{F}\cos\theta =mg$$ $$T_{F}\sin\theta=\frac{mv^2}{R}$$ $T_{F}$ represents tension in the string. $v$ is the velocity of bob at this ...
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5answers
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What comes first: Work or kinetic energy?

Suppose we have a body initially at rest. Now a force ($F$) is continuously applied on it and it gets displaced by some distance $x$. My tutor said that from work energy theorem it gains kinetic ...
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Properties of inertial reference frames from different perspectives

I was thinking about the following, a block on an inclined plane no friction. However this inclined plane is in a truck accelerating forward. Note: the inclined plane doesn't slip. So I wondered what ...
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Solving of work done due to a non-conservative force

Q: A particle of mass m moves in the $x$-$y$ plane along the curve $y = x^2$. At $t = 0$, the particle is at $ (1,1) $. The direction of motion at that point is as shown in the graph. The particle is ...
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Problem in understanding inertial and non-inertial frame of reference

Consider a person standing still on the ground and a car, which is moving with a constant speed $v$ in a straight line. From the frame of reference of the car the person is moving backwards with same ...
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Partial derivative in Newtons Second law

Newton's second law states Force is the time derivative of momentum. But is it a total derivative or partial derivative? What is the reason behind it?
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Feeling heavy in an upward accelerating elevator - is it a pseudo force?

In an elevator accelerating upwards, a person weighs "heavier" on a scale. The normal force can be expressed as $N=m(a+g)$, a being the upward acceleration. In this case, is $ma$ a fictional ...
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Tangential friction acting on a bug as it moves from center to periphery of a rotating disk

The question is if a bug is moving from center to periphery of a rotating disk or lets say vice versa; there is a tangential friction acting on the bug which is producing some torque. The small doubt ...
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Doppler effect with circular motion [closed]

I've been struggling with this question that turned up in a physics exam last year and just can seem to get anywhere close to the answer. From the attached picture: An object is moving in a circle ...
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1answer
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Escape Velocity from Earth and Sphere of influence

I know that escape Velocity from the earth's surface is 11.2 km/s. But is that the minimum velocity to get to orbit (L.E.O I guess) or to escape earth's sphere of influence?
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How to find angle using $τ = Iα$? [closed]

I want to find angle (radians) using the formula: $τ = Iα$ . I guess after finding angular acceleration α I have to do an integration but I am not sure which method I should use.
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1answer
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Pulley problem: I included the here the the picture of what i already tried doing [closed]

Pulley problem Problem: Find the tensions in the two cords and the acceleration of the blocks if friction is negligible. The pulleys are massless and frictionless, m1=200g, m2=500g and m3=400g. I am ...
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2answers
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Relative velocity, momentum conservation

I am having difficulty in conserving momentum for objects moving with relative velocities. For example: A block of mass $m$ with a semicircular track of radius $r$ rests on a frictionless ...
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1answer
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What does a scale attached to an Atwood machine measure?

Assuming a massless and frictionless pulley with two arbitrary masses, what is it that the scale actually measures of the system?
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Computing the distance where two solids reach each other using basic speed formula (high school problem) [closed]

A car$B$ which moves in a straight line at a speed of $50km/h$ arrives at a point$B$ ($d_{B}$) on the line, and a car $A$ which moves in the same straight line at a speed of $100km/h$ reach the point$...
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1answer
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Why does the left cup’s top region till where the water is filled the most hot point and not the points below?

So I have two cups here. Black cup on the left and a white cup on the right.The region where I have made a dark red horizontal line is the region till where the water is filled.The left one is made ...
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Circular Motion Question - 11th Grade

I have been recently solving physics questions since I have an exam next week. I came up across the following question and I have been trying for a good amount of hours to solve this question. The ...
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3answers
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What drives the free end of a slackened string?

Let's consider a gentle situation. A small puck is attached to a string. The string is sufficiently long in length. The setup is placed on a frictionless surface. One end of the string is nailed to ...
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Variation of Intrinsic losses w.r.t spring constant

How intrinsic friction losses (or energy losses) of a real spring varies w.r.t its spring constant? I am not expecting a direct relationship between the two, but at least whether more stiffer springs ...
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4answers
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When to use $x = A \sin (wt + p)$ and $x = A \cos (wt+p)$ during Simple Harmonic motion when we start our clock not between mean and extreme position?

When to use $x = A \sin (wt + p)$ and $x = A \cos (wt+p)$ during Simple Harmonic motion when we start our clock when the object is between mean position and extreme position ? I have been trying to ...
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Mass calculation of a body having a constant horizontal force of 10 N which travels 18 m in 6 seconds? [closed]

How i must calculate mass of a body having a constant horizontal force of 10 N which travels 18 m in 6 seconds? I had thought of finding acceleration in order to apply the second law of dynamics, but ...
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Calculation of Intrinsic energy losses of spring

How can I calculate intrinsic damping energy losses of a spring theoretically. What variables do I need in order to get an approx idea of internal energy losses of spring?
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Solve without using pseudo force [closed]

A block can slide on a smooth inclined plane of inclination Φ(theta) kept on the floor of a lift. when the lift is descending with the a retardation a, the acceleration of the block relative to the ...
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1answer
123 views

Inertial pressure on in a rotating syringe

First question on stackexchange. Hopefully somebody can help me out. I'm struggling to express the following eloquently. I have a rotating syringe tipped with a needle. rotation speed w, with radius ...
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Explain briefly why the total mechanical energy is not conserved

A uniform circular disk is free to rotate in a vertical plane about a smooth horizontal axis through its center $O$. An insect P is at the lowest point A of the disk and the whole system is at rest. ...
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1answer
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Why collisions with other molecules not taken in account here?

I have few doubts related to this derivation why collisions with other molecules not taken into account since they could also influence the time it takes for one molecule to collide with the wall how ...
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2answers
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What is the physical significance of the rate of change of a body's momentum with respect to the displacement it travels through, $dp/dx$?

This is something I've been trying to wrap my head around as I review mechanics, particularly conservation laws, in depth. I see the conservation of momentum and conservation of energy as sort of two ...
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5answers
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Zero gravity means zero friction?

The frictional force acting on a body placed on a horizontal plane is $F=\mu{R}$ where $R$ is the normal reaction and is equal to weight of a body in this case. And $\mu$ is the coefficient of ...
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1answer
909 views

How do the following variables affect the period of a Bifilar pendulum?

Hey everyone, I am a high school student from New Zealand and I have 4 questions concerning the period of a bifilar pendulum system. It is very much appreciated if you can answer in a detailed ...
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1answer
603 views

Force balance for belt-pulley-mass model (2nd order response system)

I am trying to model a mass being driven by a motor (Angular acceleration $\dot{\omega}$ and shaft-polar modulus $J$) with belts and pulleys. This is then being compared to numerical simulations. I ...
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1answer
26 views

Energy lost due to air drag of a varying velocity object

How do we calculate total energy lost of an object due to air drag which is moving with varying velocity (from 'v1' to 'v2' m/s with an acceleration 'a' and over a displacement 's') in air? Assume ...
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2answers
141 views

Measure imbalance from within wheel

I want to measure static imbalance in a (car) wheel, using an accelerometer. This imbalance can be caused by tire, rim damage, dirt in the tire etc. The imbalance causes the center of mass to be ...
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1answer
35 views

Is this particle always equilibrium vertically that is $Rsin(\alpha)=mg$ where $R$ is reaction on particle?

A thin smooth straight tube $OA$ is constrained to rotate with constant angular velocity $ω$ about a fixed vertical axis through $O$, and a particle is free to move in the tube. The angle between $OA$ ...
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4answers
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Calculating the direction of friction on an inclined plane/Determining the fate of a round body on an inclined plane

Question: If a round object (say ring or a sphere) is kept on a rough inclined plane of inclination $\theta$ and coefficient of friction $\mu$ is such that it exactly balances the component of weight ...
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0answers
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Variation of internal damping losses with spring constant [closed]

How internal friction losses (or energy losses) of a real spring varies w.r.t its spring constant? I am not expecting a direct relationship between the two, but at least whether more stiffer springs ...
2
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1answer
241 views

Effect of forces inside a sphere

What would be the effect of applying two parallel forces of the same value at opposite points of the equator inside a sphere? Common sense tells me that it wouldn't move, but it seems that it could ...
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Is there a way to solve this question using instantaneous center method? [closed]

This question is about instantaneous center method of finding velocities. I saw this question on a exam paper, but i think the question may be wrong because i couldn't find a way to get IC(1,3) Or ...
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2answers
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Kinetic energy and acceleration of two bodies (easy) [closed]

I am really confused by this and I am not sure what assumption I have made that is wrong. KE $ = \frac{1}{2}m v^2 $. Consider a system of a BOX and a BALL and they both have a mass of $2 kg$ each: ...
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1answer
59 views

Spring mechanical losses calculation [closed]

A real spring (having damping losses), attached with a mass is stretched for a distance of x mm from its equilibrium, then what is the distance it will cover on the other side when released from this ...
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51 views

What happens to their momentum? [closed]

A Russian cosmonaut with mass 87 kg and a US astronaut with mass 94 kg are outside the ISS and decide to run a momentum experiment. They are motionless facing each other palm to palm, then push apart ...
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2answers
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What is the derivative of velocity with respect to height?

I have a question on fluid dynamics which requires to find the derivative of velocity wrt to height? It was solved by my teacher but I am not able to grasp the solution. Here is the question: - A tank ...
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1answer
109 views

Can someone please explain this paragraph on work from the Feynman lectures?

This is a portion from Feynman Lectures: ...............We have proved previously that the answer is zero for any path composed of a series of notches like those of Fig. 13–3, and also that we do the ...
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2answers
48 views

Calculate total angular momentum of object rotating about 2 axis (e.g. Earth)

Consider the Earth. It rotates about its own axis (going through the poles) with some angular velocity $\vec\omega$, and around the sun, with some angular velocity $\vec\Omega$. In every textbook/web ...

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