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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 ...
21 views

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 ...
31 views

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. ...
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.
18 views

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 ...
36 views

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?
1k views

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 ...
51 views

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....
10 views

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 ...
11 views

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?
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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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 ...
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 ...
46 views

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 ...
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...
23 views

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 ...
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....
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 ...
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 ...
15 views

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. ...
39 views

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 ...
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 $\vec F_1 ,\vec F_2, \vec F_3$ ...
20 views

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.
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 ...
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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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 ...
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 ...
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 ...
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,...
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 ...
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\...