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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Why is it harder to walk on sand as opposed to a flat foor although the former has a higher friction coefficient?

It is a common experience that it is harder to talk on sand as opposed to walking on a sleek flat floor, even though it is evident that the former is more abrasive than the latter?
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Swords and wing flutter

In order to retain structural integrity it is understandable that a sword has to be flexible enough to be able to absorb impact without shattering and rigid enough to not be bent due to it. Is this ...
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1answer
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What does it mean that the relationship between material mass and weight is constant and proportional?

I hope someone can help me with this apparently very basic doubt, but I feel like a stupid monkey trying to join two sticks to reach bananas and without success. My English is not good, I am Mexican ...
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2answers
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Angular momentum and momentum of a force explanation for students of an high school

This question is created to get additional information for my students from a high school. We know that the angular moment is given by: $$\mathbf{L}=\mathbf{r}\times \mathbf{p}=m(\mathbf{r}\times \...
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Compression of a spring

I find the following situation: I have a spring with constant $k$ that meets a mass $m$ at one of its ends, which is elongated at a distance $L$ from the equilibrium point as shown in the figure. If ...
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Fixed volume air flow to vacuum

I have a work project and am trying to wrap my head around the foundational aspects of the fluid dynamics before I attempt to take measurements. I want to have an idea of what to expect compared with ...
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1answer
23 views

Condition for a full rotation of a pendulum

A sphere $(m)$ hangs on one end of a non strechable and weightless thread of length $L$ and the other end is firmly fastened on a pivot $A$. $(m)$ has initial speed $v_0$ as shown in the picture. ...
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2answers
38 views

Can a collision between a large and small mass result in final velocity greater than initial velocity?

If you have some large mass with a velocity $v$, and some small stationary mass, is it possible for a collision to occur that results in the smaller mass having a velocity $v_f> v$, and perhaps the ...
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1answer
21 views

Confused about linear displacement in circular motion

We know that velocity is the derivative of displacement w.r.t. time. Keeping this mind, suppose that we are traveling across a circle where we go from point A to point B. In textbooks, it is said that ...
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5answers
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Objects falling from table

It is an everyday experience: You have placed an object a tiny little bit too much over the edge of a table and it falls down. This is the case when the center of gravity is above the floor and not ...
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1answer
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Difficulty with applying the Work-energy theorem

Question: A block of mass $m$ is lying on a smooth horizontal surface when a force $F$ is applied on it horizontally. If it's kinetic energy as a function of displacement $s$ is given by $k s^2$, then ...
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Differences in using Clausius-Duhem inequality vs Principle of Virtual Work/Power in derriving constitutive equations?

I am a novice getting my toes wet in continuum mechanics and nonlinear elasticity. I have seen papers that use both approaches in developing constitutive connections to compliment balance equations of ...
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What factors influence the energy loss in a bounce?

Suppose a spherocylindrical solid is let to fall from some height to a flat, solid surface, bouncing some height up after it reaches the surface. The object clearly loses some of its energy due to the ...
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Pendulum with flexible connecting rod: synchrony in nature

Consider a pendulum with a flexible connecting rod. When initializing the free motion, the bob would be released at a position such that the connecting rod is flexed as shown in the figure. There are ...
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2answers
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What is the unit for modulus of elasticity?

I've previously asked a question regarding the modulus of elasticity which I am still unsure about. I've been told various formulae to calculate the modulus of elasticity, some of which give answers ...
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1answer
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Mechanics: objects in contact

I was reading a textbook example. The question stated that ‘a person of mass $72 \; kg$ stands in a lift of mass $540 \; kg$. the lift is supported by a cable that can be modeled as light and in-...
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Why is the radial velocity considered zero?

I had recently come across a question which is stated as below: A disc placed on a large horizontal floor is connected from a vertical cylinder of radius $r$ fixed on the floor with the help of a ...
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It's a question from a book I can't solve [closed]

A block A of mass m and length l is placed on a horizontal floor. Box B is used to cover A. The distance between interior of walls of B is (>1) and the mass of B is also m. The coefficient of ...
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1answer
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How do I calculate the modulus of elasticity of a spring when I don't know the cross-sectional area? [closed]

'An elastic spring of natural length 1.5 m has one end attached to a fixed point. A horizontal force of magnitude 4 N is applied to the other end and compresses the spring to a length of 1 m. Find the ...
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What is the net work done on two different systems?

Assume that we applied a force on an object so it moves at a constant speed upward, and we defined our system as the object only. I was taught in my physics class that if we want to calculate the ...
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1answer
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What would happen if you drew electricity from a magnet in orbit?

So suppose you had a big, dense, heavy magnet that we got into orbit. In its path of orbit would be a tube of copper wire running all the way around the planet. So it would be orbiting the planet, ...
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1answer
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Vector Resolution

I want to clarify if this statement $F_3$ is resolved along the u and w axes means that the $F_3$ is sort of a resultant of u and w axes.
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1answer
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Negative or positive newtons

Do we write A car needs 6000N of force to be stopped or A car needs -6000N of force to be stopped
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Why is more difficult to pull a short spring than a long spring? [closed]

Why is more difficult to pull a short spring than a long spring? I guess it has to do with the law of the levers but I am not sure
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Binary stars orbiting around each other are equidistant [closed]

This is a problem that was given to me in my Classical Mechanics course: J.S.Plaskett's star is one of the most massive stars known at present. It is a binary star, that is, it consists of two stars ...
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Physics of Weight-Lifting [duplicate]

I am the Soldier of Steroids and I have a question regarding the concept of "work done" in Classical Mechanics, inspired by my time in real life situation of me the gym (after taking ...
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1answer
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Roll, slip, or bounce?

A sphere is dropped onto an infinite inclined plane. Can we predict whether the sphere rolls, slips, or bounces after hitting the surface? If so, how can we predict this?
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Collision time of two objects [closed]

The object $A$ starts motion with constant speed of $u$ as shown in the figure. At the same instant $t=0$, the object $B$ starts motion with constant speed of $v$ by a lateral separation of $L$ from ...
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You hurl a satellite from the space station with a force of 2000 N, applied in the direction of motion, over 1 meter [closed]

I wanted to know what speed does the satellite attend with respect to the space station in this situation? Assume mass of satellite = 1000 kg I calculated the orbital velocity of the space station ...
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1answer
33 views

Intuition on Different SI Units and Squaring Decimals (Beginner Question)

So this is a very basic question. I am certainly not in grasp of some key aspect of physics equations here. I hope someone will be able to help me out. Here is the equation for drag force: $$F_{D}=\...
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A particle of mass $m$ is moving in a straight line and a constant resistance force of magnitude $F$ is exerted on it [closed]

a particle of mass $m$ is moving in a straight line and a constant resistance force of magnitude $F$ is exerted on it. If it starts with a speed $V_{0}$ $a)$ How long does it take to stop? $b)$ What ...
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3answers
61 views

Why do balls bounce in terms of force, momentum and energy?

From what I understand, as a ball is released from some height above a surface, it accelerates downward at 9.81m/s^2 due to the Earth's gravitational field. Once it reaches contact with the solid ...
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1answer
70 views

My simple pendulum has a period about 1/3 what it should be

I'm a high school science teacher, my primary degree is in Physics, so I have a solid grasp of the background. I'm running into a strange issue with a pendulum lab I had my students complete. We're ...
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2answers
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Forces in a redirected rope where both strands are loaded

So, if I take a rope, 'fold' it over something to redirect it and then load both strands in the same direction with a certain force, each Strand of the rope should See 50% of the tension, right? But ...
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3answers
102 views

What rotates a door, torque or force?

I am confused as to what causes a door to rotate. Assume I apply a force to the edge of the door, with the door initially at rest. Force is perpendicular to the door, so it would create a torque. But ...
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1answer
102 views

What are Kepler's laws in equation form? [closed]

So, I know about the worded explanations about them. I also know the equation for Kepler's Third law: $$\left(\frac{P}{\mathrm{yr}}\right)^2=\left(\frac{a}{\mathrm{AU}}\right)^3$$ I have also seen ...
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1answer
40 views

Second order ODE for constant external force

Given a general ODE for damped spring with constant external due to gravity $$my'' + \gamma y' + k y = -mg$$ where $m, \gamma, k, g$ are positive. I have to show that given an initial condition, the ...
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Physicists in Space want to reach his rocket using minimum rope [closed]

A man of mass $M$ kg, in space is $L$ units away from its rocket with a hook of mass $m$ kg attached to a mass less rope. What should be the minimum length of the rope so that he could reach his ...
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1answer
36 views

Moving an object from a height to the ground at constant velocity, difference between normal vs applied force

An object is at rest on top of a level surface such as a table at height $h$. Under this condition, a normal force is acting on the object from the surface of the table as well as the force of gravity....
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2answers
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A person has 2 weighs in his hand, he jumps onto a trampoline and releases the weights. What is the new height the person will achieve? [closed]

A person 60kg holds 2 weighs in his hand (30kg each), jumps from a height of 3m and releases the weights as he strikes a trampoline at height 0m, what height does the man achieve after the bounce? ...
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0answers
23 views

Difference between fixed pulley and movable pulley

What's the difference between the tension and acceleration produced by a fixed pulley and movable pulley? Is there some difference between the direction and magnitude of the tension produced by the ...
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1answer
41 views

Gravitational field in a hollow sphere in the presence of another mass nearby non zero. Why is that so?

I have learned that charges inside a conductor align themselves in an external field such that the net electric field inside them is always zero. My teacher taught me that most concepts of gravitation ...
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3answers
118 views

Power and work contradiction

A body is starting from rest. A force is acting on it for a short period of time. In that given time, power delivered to it at any instance $t$ is given $$P = F \cdot v_1 = ma \cdot v_1 = mv_1^2/t,$$ ...
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1answer
47 views

What limits the maximum reaction force that can be exerted by the table?

Suppose I have an object placed on a table which exerts a force $$W=mg$$ on the table. The table provides a reaction force which is $-mg$ if the table does not accelerate. However if the table breaks,...
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1answer
60 views

Differentiating between the formulas for Static and Kinetic Coefficients of friction

With an object sitting at the top of an inclined plane, the static coefficient friction can be calculated with the simplified equation of: μ = tan(θ). In the same way, with an object moving down an ...
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1answer
28 views

Graph of reaction force of bouncing ball

Let's consider a ball of mass 1kg with initial velocity 8m/s and final velocity -5m/s after bouncing off the floor, the duration of contact with the floor is 0.06s, therefore the average force is 217N....
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1answer
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Question on force and friction (beginner level)

Please read this question thoroghly. I just want to clear my conception. Suppose I have a mass $M_1$ and another mass $M_2$ on top of $M_1$. Now if I pull M1 with force F ,******the whole system ...
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25 views

What amount of force does the average person exert when hammering a nail into an object/concrete? [closed]

I am designing a long reach hammer that can pile nails into concrete that's used for reinforcement and formwork for my senior design project. I just need to know how much force one exerts with a ...
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0answers
21 views

Simple Harmonic Motion of a particle attached to a spring all inside a circle

I want to understand the following problem: The way I approached this question was using Hooke' Law. I managed to solve for $\lambda$ and later made a differential equation through which I got a ...
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1answer
24 views

3 block system on a frictionless plane [closed]

3 blocks of the same mass are attached with each other by a massless string. If a force $F$ is applied at one end, then what is the net force on the middle block? [The plane is friction less]

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