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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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9 views

Limiting conditions of archimedes principle?

Consider a hemispherical object immersed in a container filled with a fluid, such that the plane surface touches the bottom surface of the container.Density of the object is lesser than the fluid. By ...
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Behavior of a drone inside a car

I have this thought experiment. The car is stationary. A kid inside a car takes off with a drone (a small drone of this kind) and keeps it hovering in the center of the car. Daddy gives gas and ...
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3answers
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Conservation of momentum: Collision involving Tenis ball on top of Basket ball

I am asking about this video where The Physics Girl drops a system of balls from a height. I am trying to estimate the velocities just after the collision using the law of conservation of momentum. ...
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1answer
66 views

How may the situation, when there is no inertia? [duplicate]

I want to know clearly the real concept of inertia.I have seen lot of definitions regarding inertia.But I could not exactly find real meaning of inertia.
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what happens when Normal force is greater than $mg$?

I know what happens when mg is greater than Normal force .But I am little bit confused of the concept of Normal force.I mean imagine the situation Normal force is greater than mg.
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Physics force Questions help [duplicate]

A satellite has a mass of 6443 kg and is in a circular orbit 4.17 × 105 m above the surface of a planet. The period of the orbit is 2.4 hours. The radius of the planet is 4.72 × 106 m. What would be ...
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Physics Force Gravity Question [on hold]

A satellite has a mass of $6443$ kg and is in a circular orbit $4.17 \cdot 10^5$ m above the surface of a planet. The period of the orbit is $2.4$ hours. The radius of the planet is $4.72 \cdot 10^6$ ...
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Mechanics of Two Strings Coupled Pendulums of different lengths

with reference to this video: https://www.youtube.com/watch?v=XsgjWbyaru8&list=PL5DEADB2E11ADCCCF&index=21&t=0s can anyone explain what happens if the two strings have different lengths?
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Newtons Laws Of Motion [on hold]

Wedge constraints What are wedge constraints? How are they applied? What are some of the methods to get answers of these questions by using special approaches?
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3answers
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What helped Einstein to provide a more accurate description of gravity than Newton?

Newton's explanation of gravity as an attractive force seems to have been superseded by Einstein's explanation of gravity as warping of space-time. Was there any advances in math and science that was ...
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Maths behind a Trebuchet¹

I want to throw pumpkins up in the air. More specifically, I want to throw discarded Jack-O-Lanterns about 100 M so people can shoot them up with shotguns. Think of it as post-halloween trap shooting....
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Payload in spinning tube

I am trying to understand the forces of an object or payload in a spinning tube. I know centrifugal isn't a real force, yet I'm trying to calculate centrifugal acceleration. Now my centripetal ...
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Mechanical power [on hold]

A constant power Plant is applied to a particle of mass m. What is the distance travelled by the particle when it's velocity increases from v1 to v2?
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27 views

The normal force on incline with external force

I am working on making a physics simulation in order to better understand physics, and have a question: If there was a ball that was thrown at angle a with force f and hits an incline with angle b, ...
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1answer
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Mechanics problem, car movement with delay

The problem in question is as follows : An (infinite) queue of cars stops at a red light, every car has the length $l$ and the distance between two cars is $d$, with the first car $0m$ away from the ...
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1answer
31 views

Damping of horizontal mass-spring system at high velocities

I am trying to study the damping of a horizontal mass-spring system at high velocities. The equation for damping due to a viscous fluid at low velocities is: $$ma-cv-kx=0$$ I changed the equation ...
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3answers
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Difference between static friction and kinetic friction

I don't understand the difference between static friction and kinetic friction. I understand that the force of frictional force acting on a stationary object is the static frictional force and we use ...
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3answers
66 views

A problem on Motion

I'm having this problem in my textbook: "A rocket with a lift-off mass 20000 Kg is blasted upwards with an initial acceleration of 5 m/s². Find the initial thrust (force) of the blast. Take g=9.8 m/s²...
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Calculation of magnitude and direction of impulse [on hold]

A satelite of mass 50kg is to be put into orbit 500km above the earth surface assummed to be of uniform radius.if after its launch the velocity is 2000m/s ,calculate the magnitude and direction of ...
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0answers
45 views

How to calculate mass of an object rotating at constant speed [on hold]

How do you calculate the mass of an object rotating at a constant speed? I can't seem to get it. Here's the problem I was given: A mass m is moving in a circle of radius r=3.2m at a constant speed....
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3answers
72 views

Man inside an accelerating train carriage [on hold]

I'm having trouble recognizing the forces at play here. If we have a man is standing inside a train carriage which is accelerating, and the coefficient of friction (for simplicity dynamic and ...
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0answers
55 views

How to calculate the coefficient of kinetic friction using deceleration? [on hold]

The original question is: A sled is pushed along a snowy road with velocity $v = 2.5\,\mathrm{m/s}$. When it is released, it glides along for $6.4\,\mathrm m$ before coming to rest. Find the ...
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Collision (elastic and inelastic) [on hold]

An object A of mass 2kg is moving with a velocity of 3m/s and collides head on with an object B of mass 1kg moving in opposite direction with a velocity of 4kg . After collision they stick together. ...
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2answers
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Why $g$-force increase with radius and centrifugal force decreases? [duplicate]

Trying to understand the 2 formulas and the relations between radius. Common sense will tell me that centrifugal force increases while we are on a curve with a short angle , as newtons law formula ...
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2answers
843 views

What's the physical meaning of the standard base vectors?

I can find 3 displacement $\vec d_1 ,\vec d_2, \vec d_3$ and use them as basis so that a displacement is $\vec d=a\vec d_1 +b\vec d_2+c \vec d_3$. I can find 3 forces $\vec F_1 ,\vec F_2, \vec F_3$ ...
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Mass spring system [on hold]

I have a question that i cant figure it out. I would be so pleasent if you can help me.
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21 views

Necesary time to let a particle at equilibrium point

I remmember that exists a demostration of this time is actually infinite, but I cannot find it. We have a potential V(x) that it had a local max, and a local min at least. If we give to a particle ...
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0answers
43 views

Oil droplet in Electric field [on hold]

suppose a horizontal plate capacitor. They are separated by $d=0.005 \text{m}$. In a homogeneous field, the oil droplet ($m=3\cdot 10^{-15} \text{ kg}$) sits at the bottom of the lower plate. Like a ...
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54 views

A simple derivation for the motion of the Simple Harmonic Oscillator [on hold]

In order to solve the equation $\frac{d^{2}y}{dt^{2}}=-ky$ where $k>0$ is a fixed positive constant, most standard textbooks seem to talk about using trial solutions of the form $y=e^{\pm i\sqrt{k}...
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Curvilinear problem [duplicate]

A person is riding their bike in a circle of radius $r$, at a speed of $v$. The person throws a tennis ball towards the centre with a speed of $u$. However, the tennis ball misses the centre. From the ...
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27 views

Coordinate Frame Misalignment Question

Quick math question here involving coordinate frame transformations: Lets say I have a terrestrial robot with instrument coordinate frame in ENU, and it has angular misalignments (let’s say theta, ...
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23 views

Gravitational force vector [on hold]

Three 3kg balls are placed on a table at the corners of a right angled triangle. the size of the triangle are a=0.4m,b=0.3m and c=0.5m. calculate gravitational force vector for each ball?
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1answer
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I'm in a moving train filled with vacuum. I'm leaning to the rear wall, so the train pushes me forward. If I drop a ball, woudn't it hit my chest?

I'm assuming it has inertia, so no, it would continue to move forward and just fall to the the ground of the train. But has anyone really performed this experiment in a vacuum? In the absence of ...
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2answers
40 views

System kinetic energy interpretation(edited)

How can I make a “further interpretation” of the 2nd term of system kinetic energy when it comes to “fluids”? (Possibly deformable body, too) Linked pdf below is not lecture note of mine, however, my ...
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1answer
25 views

Does an object in a v-shaped channel experience static friction?

As the title states, I was wondering if an object that is at rest in a horizontal, v-shape channel like the one in this diagram would experience static friction:
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1answer
38 views

Bicycle physics [duplicate]

From a long time, I have a question that bicycle is not stable at low speed or for that matter it's difficult to balance bicycle on its wheels in static position (with zero speed and no brakes). Can ...
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1answer
35 views

Simple model for friction in a pivot joint

Consider a pendulum that is attached to its pivot point using a hinge or ball bearing joint. What is a simple but reasonable approximation for modelling friction in that joint? Background: I'm ...
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0answers
21 views

How do I look for strain? I cant find any way to start the question [on hold]

How do I find the question? Much appreciated
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1answer
50 views

Rate of change of acceleration [on hold]

I am trying to figure out some equations for a program I'm writing and I'm kinda stuck. I don't have the best experience with math or science so bear with me here please. I am trying to calculate ...
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1answer
40 views

Why the gravitational potential energy at infinity is zero?

If an object is taken from earth's surface to infinity, it's gravitational potential energy becomes zero (always taken as zero), but it doesn't make any sense as energy can never be destroyed so where ...
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0answers
35 views

Friction on Inclined Plane [on hold]

Please refer to the following picture: A mass m1 is placed on a ramp whose surface is frictionless. Another mass m2 is placed on top of m1. Release both masses so that they start sliding down the ...
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1answer
70 views

Problem on conservation of energy [on hold]

A parcel is launched at speed of $3.0\; \mathrm{ms}^{-1}$ up a rough plane inclined at an angle of $35^o$ above the horizontal. The coefficient of kinetic friction between the parcel and the plane ...
2
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4answers
115 views

Newton's third law and Coulomb's law

Coulomb's law states that if we have two charges $q_{1}$ and $q_{2}$, then $q_{1}$ will act on $q_{2}$ with a force $$ \textbf{f}_{12}=\frac{q_{1}q_{2}}{r_{12}^2} { \hat {\textbf {r}}_{12}},$$ and $...
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2answers
34 views

Physics terminology: Can a light beam be displaced?

Say you have a rotating mirror and a fixed laser beam pointed towards the mirror such that the reflection of the beam changes direction. Can you say that the light beam has been displaced? Why or ...
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0answers
18 views

Terminal velocity and distance traveled of a sphere in a liquid [on hold]

I have actually done this question, but I think it's wrong. The terminal velocity I got was 6000 m/s and a distance traveled of approximately 4000 km. The question is: A sphere with radius R = 5.0 cm ...
4
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1answer
118 views

A bead on the wire loop

In my physics book there is a question which stated is as follows: A thin circular loop of radius $R$ rotates about its vertical diameter with an angular frequency $\omega$. Show that a small bead ...
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1answer
43 views

Who will win the race?

There is a wedge which is inclined at an angle X to the horizontal.Supppose two carts of same mass M one having 3 wheels and the other having 4 wheels are released from rest at the top of the incline,...
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4answers
68 views

Can someone explain what is the force the ball will exert?

If a ball is falling under free fall then the force exerted by the ball on the ground would be $mg$. But that's not the case in real life ball would hit with more force. But when i draw free body ...
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0answers
40 views

Write Equations of motion and a phase portrait of a point particle [on hold]

A point particle with mass m = 1 moves along the X axis under the the force $f (x) = x^3 + x^4$. Write the equation of motion of the point and draw a phase portrait. What I have so far: So, $f = m\...
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0answers
37 views

Find gravitational force of a point that moves along an ellipse [on hold]

A point with a mass of 20 g, that moves under the force of gravity to a fixed center according to Newton’s law of gravity, moving along a complete ellipse with 10cm and 8cm axes for 50 seconds. Find ...