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.

learn more… | top users | synonyms (3)

0
votes
1answer
18 views

Why isn't momentum conserved in this pulley problem?

I have some conceptual doubt about method of solving this problem. 24. A block of mass $m$ and a pan of equal mass are connected by a string going over a smooth light pulley as shown in figure ...
2
votes
2answers
63 views

Can atoms with top / bottom quarks exist?

Do we have examples in nature or the lab of atoms constructed of 2 top and 1 bottom quark and a tau selectron? How would its properties differ from a hydrogen atom?
0
votes
0answers
31 views

Reason for strange magnetic ball movement

I was playing with a set of those neodymium magnet spheres and noticed a couple of strange behaviors (which I believe are related so I'm only positing a single question) and I was hoping to get an ...
-1
votes
2answers
49 views

Period of a T-shaped pendulum [on hold]

I'm trying to calculate the period of a pendulum that has a T-shape. For a normal pendulum it's $T = 2 \pi \sqrt{\frac{L}{g}}$ so with $L = 1m$ and $g = 9.8\frac{m}{s^2}$ it's about 2 seconds. I've ...
1
vote
1answer
68 views

Height of Water 'Splashing'

Suppose from a height $H$, I throw a ball of mass $M$ and radius $R$ with initial velocity $u$ into a pool of depth $x$ having a liquid with density $\rho$ and coefficient of viscosity $\eta$. ...
0
votes
0answers
19 views

Net force when deriving relation between torque and angular acceleration

When deriving the equation $\tau = I\alpha$, it is assumed that $$F_{tangential}=ma_{tangential}$$$$a_{tangential}=\alpha r$$$$\tau=rF_{tangential}$$$$\tau=mr^2\alpha=I\alpha$$ However, doesn’t ...
0
votes
2answers
54 views

Vertical Circular motion - Tension and velocity

I read through the question Minimum velocity of the particle at the highest point which is quite similar to my questions. But I still have some doubts in the answers - "The particle will complete ...
0
votes
0answers
22 views

Is there a constant decay of particles that maintains the value of the Quantum Vacuum? [on hold]

By my question I am attempting to understand how the Vacuum of space remains at a constant value, (GR the universe on the large scale matches the “critical” energy density of about 8.5×10-10 J/m3) ...
-3
votes
1answer
59 views

Without friction, what happens in our life? [on hold]

Generally all are subject to friction. So friction is most a essential part of our life, if friction is not available in our surrounding then what would happen in our life and which technique could we ...
0
votes
2answers
40 views

Gravitational force acting on two particles

According to Newton's Laws of Gravitation, $F=Gm_1 m_2/r^2$ So gravitational force F is directly proportional to $1/r^2$. Now if we consider 2 point masses in vacuum at rest at a distance 'd' ...
-1
votes
1answer
17 views

Stress( Mechanics) [on hold]

The diagram represents a steel tube with wall thickness $w$ which is small in comparison the diameter of the tube. The tube is under tension, caused by a force $T$, parallel to the axis of the ...
0
votes
0answers
21 views

Dynamic coefficient of friction

Is there any way or equation or table to find dynamice coefficient of friction between Aluminum and asbestos or steel with asbestos in wear test at various temperature,pressure and velocity ?...
0
votes
0answers
23 views

Finding the potential for a block on a wedge on a slope [on hold]

I'm trying to get the Lagrange equations for a block on top of a wedge which is itself on a slope. We can rotate the system to make it functionally the same as the classic block on a sliding wedge ...
0
votes
0answers
35 views

Altering a model to account for another variable

A question in my textbook asked me to find a general equation for depth fallen by an object of mass $75kg$ thrown from a bridge whilst tied to an elastic rope. Below the bridge there is a stream of ...
2
votes
2answers
55 views

Why does spinning a golf ball one way make it go further than spinning it the other way?

In golf, you'll often hear people say that one person hits the ball further than another because the one person "draws" the ball while the other "fades" it. I want to know why the direction of ...
-3
votes
0answers
22 views

Magnitude of force of air resistance [on hold]

A 68 lbf prefabricated slab is hoisted by a rope. The rope pulls with a force of 751.9 N at an angle of 6.6° to the left of vertically upward. The only other force acting on the slab is the force of ...
0
votes
0answers
9 views

Regarding IMU derivation of position/orientation

If you are familiar with IMUs (Inertial Measurement Unit) , you know that before the double integration to arrive at estimating the position, one has to subtract the gravity from the measured ...
-2
votes
3answers
57 views

How to calculate the linear speed without angular velocity? [on hold]

How would you calculate question (f) the linear velocity, without a angular velocity. The radius of the circle is 0.6m. The answer (linear velocity) should = 1.84 m/s
4
votes
1answer
87 views

Is work done by a pseudo force?

If a body is viewed from the frame of another body which is itself accelerating will work be done by the pseudo force acting on first body in the frame of second body ( provided the first body is ...
-2
votes
1answer
21 views

magnet repulsion in a cylinder [on hold]

Firstly, Am doing a research project on the use of repulsion of magnets to form a car shock absorbers. Can the forces of repulsion manage to absorb the shock of a 2.0 ton car?
0
votes
2answers
61 views

Does the frame of reference change the behavior of a particle

"Behavior" word in the title is not very correct. I'm in a train at a railway station and on the platform there is a glass case (the mass of case is 5 kg and if it gets hit with a velocity of 10 N ...
-1
votes
1answer
48 views

Calculating output forces of bicycle wheels

Based on the force on the rear gear $F_t$ and the radii of the rear gear $R_g$ and rear wheel $R_w$ , how would you calculate the force the bicycle exerts on the ground when it is accelerating? I ...
4
votes
0answers
74 views

To what depth can a whirlpool descend?

My question is based around comparing the physics of a tornado against, what I imagine/assume to be the marine equivalent of a tornado, that is a whirlpool located either at sea, in a tidal region or ...
10
votes
1answer
2k views

Why don't lakes have tides?

There's a tidal effect that we can clearly observe in oceans, which is the effect of gravity from the Sun and the Moon. If gravity affects everything equally, why don't lakes have tides?
0
votes
4answers
100 views

Does a flying bullet get KE from gravity?

A projectile P is shot horizontally at 9.8 m/s from a height of 4.9 m, considering no air friction, after a second it will have v = 9.8 m/s on the x-axis and v = -9.8 on the y-axis. Because of ...
1
vote
1answer
81 views

Rolling down an arbitrary hill with friction

I had in mind this physical situation of a point mass rolling down a hill of some arbitrary shape ($y=y(x)$, for instance a parabola about $x=0$), with a peculiar friction force whose "expended work" ...
-6
votes
0answers
16 views

What axial forces does the vertical load induce? [closed]

What axial forces does the vertical load P induce in the members of the system down in the figure? Neglect there weights of the members themselves and assume an ideal hinge at A and a perfectly ...
0
votes
1answer
51 views

Why is centre of mass taken as integral of x.dm and not m.dx?

Forgive me if I'm being naive, but, I don't understand why the X-coordinate of the Centre of mass is taken as an integral of x.dm and not m.dx. I understand the summation part, but how do we convert ...
-1
votes
0answers
25 views

Frictional pulley [closed]

Whenever we do any pulley problems, generally, it is mentioned, that the pulley is $massless$ and $frictionless$. But, what will happen if it is given that the pulley is frictional. I had gone a ...
0
votes
1answer
58 views

Calculate Spring Constant [on hold]

I am editing the question because it was misunderstood to be a homeowrk question. I am modeling a Stumps equipment for a game called Cricket.Typically the game consists of 3 wooden stumps ...
1
vote
1answer
56 views

Can 4 collinear planets exist?

Imagine 4 planets, A has moon a and B has moon b. A and B are binary planets. Is it possible that a and b and A + B all have same the period, so that the 4 planets are collinear?
7
votes
1answer
63 views

Without using rotational mechanics, why does a gyroscope precess the direction it does?

When a top is spun, it will precess in some direction, either clockwise or counterclockwise. It's possible to find out which way using $\boldsymbol{\tau} = d\mathbf{L}/dt$ and $\boldsymbol{\tau} = ...
0
votes
1answer
47 views

What will happen if all the population all over the world jumped together at the same time in sea? [duplicate]

What can happen if a magnitude of such huge force is applied over the sea water of earth? Force applied will be average mass of each person *7 billion *9.8 .
0
votes
2answers
35 views

Horizontal and vertical acceleration of a ball on a slope?

I understand that you resolve the components of the balls weight parallel and perpendicular to the slope in order to calculate the force due to gravity that actually acts down the slope. The ...
0
votes
0answers
23 views

Need reference on the minimum moment of inertia [duplicate]

I would like to know if there is a book on classical mechanics about the following Moment Of Inertia About Centre of Mass
0
votes
2answers
36 views

Pertaining to Newton's laws, how do so many objects acheive perfect equilibrium?

Suppose a light is hanging from a ceiling. Supposedly, the force of tension pulling it up is exactly the same as the force of gravity pulling it down. Why is it that the tension happens to be exactly ...
0
votes
1answer
39 views

The Real Rocket

Suppose we have a Rocket with initial mass $M_o$ and we want to sent it into space. The equation of motion is (i think... please tell me if there is something i forgot) $$\frac ...
1
vote
2answers
87 views

Why does the ground always push up?

In the example of a bouncy ball being thrown at the ground, at some angle from the normal, $\theta$, we know that the ground will apply a force in the normal direction, causing the ball to rebound at ...
0
votes
1answer
33 views

Does the mass change for a body with eccentric orbit?

I am a student with a programming and electronics background attempting to recap on orbital mechanics. I would appreciate anyone with a physics specialisation helping me understand where my ignorance ...
2
votes
3answers
82 views

Does acceleration follow the same addition like velocity?

Two frames have relative velocity $u$, but an object in one is initially at rest and in the other has velocity $v$. If it then starts to accelerate, the acceleration measured in both frames is equal. ...
1
vote
3answers
252 views

Fundamental paradox with Newton's Law of Gravity?

This is my first post here, but I've been struggling with this problem in my head since I studied physics at school when I was 14 (30 years ago!). There seems to be a fundamental paradox with ...
0
votes
0answers
26 views

Is it wrong to equate the net force to the force by the spring to find its maximum expansion?

When I want to find the maximum expansion in a spring, let's say connected to 2 blocks of different masses, and some force is applied on one of them, I find their separate accelerations and then ...
1
vote
0answers
17 views

Calculating stable orbital resonance and other factors into orbits

Firstly here is a brief summary of what I trying to accomplish. From a predetermined total solar system mass , star count in that system, per-star classification and mass I am building a system of ...
2
votes
0answers
29 views

The underlying chemical interactions behind torque

I did some searching around, and didn't find any previous topics that address torque in this specific way -- here goes: Say I just have a plain ol' piece of wood -- relatively long in one axis, so it ...
0
votes
2answers
44 views

Direction of frictional force

How will I find the direction of frictional force for any kind of motion of a moving object?
0
votes
1answer
71 views

Why is it effectively impossible to balance this rectangle block on a triangle block? (See photo)

I've always wondered why it's basically impossible to balance a rectangle block on top of a triangle one like this. This is my nine-year-old giving it a try. I have never in my life gotten it to ...
-2
votes
1answer
43 views

Equation for a physic theory [closed]

There is a theory that state and explains why everything on Earth (or on a place with same force of gravity) falls at the exact same acceleration in vacuum. What's the name of that theory, who came up ...
-1
votes
1answer
22 views

Pulley and block velocity problem [closed]

Block B is moving towards right with velocity 'V'. What is the velocity of block A with respect to block B? Note that the string has negligible mass and is inextensible, also that the pulley has ...
0
votes
2answers
51 views

How does friction act on a body, if only 2 regions on it are rough? [closed]

While tackling an Olympiad question, it came to my mind that friction need not act in the same direction at all points on a body. I thought of using integration to evaluate the net frictional force, ...
2
votes
1answer
29 views

What is the ratio of the acceleration in the two cases (a) and (b)

What is the ratio of the acceleration in the two cases (a) and (b)? I thought that the ratio would be 1:1 but it my textbook says its 1:3, so can someone explain to me how that's possible.