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].
19,394
questions
1
vote
0
answers
21
views
Angular momentum in pieces of a fracturing object [closed]
I have a physics problem that's a bit beyond my knowledge to solve and I haven't been able to find a clear answer for that I trust. Let's say I have a 2d asteroid in the shape of a convex polygon of ...
- 11
0
votes
1
answer
18
views
$N$-body simulation: total energy is conserved, but what about the energy of a specific particle?
It is clear that the total energy in a full gravitating $N$-body simulation should be conserved, but what about the energy of an individual particle? Is this not conserved, since the potential is ...
-1
votes
1
answer
32
views
Can someone please explain how the friction is exerting on each other even though it is just a surface? [closed]
Why it has some weird friction components? It said the surface has friction, alright, that means A will have a friction component on the right side and B will have a friction component on the leftside....
- 1
-4
votes
0
answers
34
views
Motion Of a cars [closed]
If a car collides head on head and the initial speed is 100 km per hour. What is the estimate time that the airbag will hit the driver in English
- 1
0
votes
1
answer
46
views
Vector Cross Product in Mechanics [closed]
$\vec{v(t)}\ =\frac{4t^{3}}{15}\hat{i} \ -\frac{3}{10} t^{2}\hat{j}$
$\vec{r(t)} \ =\ \frac{t^{4}}{15}\hat{i} -\frac{t^{3}}{10}\hat{j}$
Find
$\displaystyle \vec{r} \ \times \ \vec{v}$
I am working on ...
- 19
0
votes
1
answer
47
views
Does the earth exert centrifugal force on us in air?
Whether the centrifugal force exerted by earth due to rotation be felt or even applied to us if we were in air ? The landmass rotates with earth so it is exerted on us radially outwards , but that isn'...
- 35
3
votes
1
answer
23
views
Air resistance in two dimensions
Suppose I have a ball moving through the air parallel to the ground, and diagonally in some 2D x,y coordinates (along the line y=x). Let's say its velocity is 1, which means on the X axis and on the Y ...
- 435
0
votes
1
answer
57
views
Power consumption / energy expenditure to maintain constant velocity while riding a bicycle at $1\times$ velocity vs $2\times$ velocity
Consider the case of someone riding a bicycle on an even horizontal surface at a constant velocity. As they are riding at a constant velocity, there is presumably a constant energy expenditure (which ...
- 6,439
0
votes
0
answers
26
views
Engineering Mechanism Modelling Project [closed]
I’m currently working on a university group project where we have been tasked with creating a system to deploy solar panels for electricity generation from the back of a pickup truck.
The Design we ...
- 1
-6
votes
0
answers
38
views
Can you solve this problem for me [closed]
In a Physics demonstration, Mr. H rests an 8.86-kg mass on a smooth horizontal table. The mass is connected to a light string that passes over a pulley and then is fastened to a hanging 11.62-kg mass.
...
0
votes
1
answer
31
views
Tangential Acceleration of a pendulum
I have looked at previous questions on physics stack exchange and it has been really helpful, but this is my first time posting so I would be grateful for any information anyone can offer.
My question ...
- 1
0
votes
0
answers
19
views
How do you estimate the maximum height of a trampoline jumper? [closed]
Sorry for my poor english in advance, I am German. I have a homework and it is about finding out the maximum height of a trampoline jumper + we have to show an example with selfmade datas (like ...
0
votes
1
answer
32
views
Force exerted on vehicle when hitting an object [closed]
How can i calculate force that is exerted on a vehicle when it hits an object?
Vehicle speed is 40 km/h, mass is 1500kg
Object is standing still (speed is 0 km/h), object mass is 11kg.
Now this ...
- 1
3
votes
2
answers
262
views
Is weight distribution influenced by the location of the weight's attachment points (see drawing)?
Is there any difference in terms of fore/aft weight distribution between the two wheels in the two pictures?
In other words: Is the location of the center of gravity of the 100kg weight the only ...
- 31
0
votes
0
answers
31
views
Could someone help in visualizing this problem? [closed]
I'm a unable understand whether the 2 rings that we seen in this image is actually the same ring at different positions? IF SO, and only if so, then position of the ring indicated by the dotted lines ...
-3
votes
0
answers
25
views
Is gravitation the same as electromagnetism less radiation pressure? [closed]
I've been researching the possibility that there is a fundamental relationship between Newton's law of universal gravitation and Coulomb's law of electric charges. I'm an independent researcher in ...
0
votes
1
answer
71
views
Why is $\sum_{i}m_iv_i$ equal to zero for a rolling ball? [closed]
I was watching a video about rotational kinetic energy in which they derived the formula $$K=\dfrac{1}{2}mv^2+\dfrac{1}{2}I\omega^2$$
each point on the circle has a translational velocity equal to the ...
- 3
-3
votes
0
answers
33
views
Is the newtonian equation precise for any non trivial situations? [closed]
When you calculate the gravitational force $F_G = G \cdot\frac{m\cdot M}{r^2}$.
Are there any cases where you get a precise result other than $m = 0$ or $M = 0$?
If so which?
It does not matter if the ...
- 1
3
votes
1
answer
80
views
Where do these forces come from?
Lets say a door is entirely supported by two hinges, one at the bottom corner and one at the top corner.
I know that the two vertical forces of the hinges are produced by newton third law, however ...
- 35
2
votes
1
answer
42
views
Liquid pressure at the atomic level
If liquid pressure is higher at greater depths, particles colliding with the container exert more force, and this is only possible if they collide with greater velocities (assuming mass to be ...
- 21
-1
votes
0
answers
20
views
Vertical acceleration of a stone on a string [closed]
A stone is tied to a 1.7 m string and whirled at a constant speed of 5.0 m/s in a vertical circle. Its acceleration at the top of the circle is:
Assume g=9.8 m/s2
- 1
2
votes
0
answers
69
views
How can the entire system be at rest irrespective of how much external force you apply? [closed]
NOTE: I only wish to understand the underlying concepts and visualization aspects. I do not by an intention mean to seek a complete worked out solution for this answer.
Now I was unable to solve this ...
0
votes
1
answer
42
views
Why are we assuming normal forces to be equal in this FBD of liquid in a container?
In such a container, a liquid with density $\rho$ is filled to the brim. I have to find the net force exerted on the walls. Since the horizontal component cancels out, only the vertical components ...
- 1,096
0
votes
0
answers
26
views
Why potential energy changes when kinetic energy does not? [duplicate]
The work-energy theorem states that the net work done by the forces on an object equals the change in its kinetic energy.
If I bring an object above ground doing same work as gravity then net work on ...
- 105
0
votes
0
answers
12
views
Momentum related question, two ball elastic collision. Asking ratio of two balls [closed]
This is supposed to be some sort of physics Olympiad question, can anyone share your thoughts on it?
- 101
0
votes
0
answers
21
views
Angular Velocity in the Plane of a Lamina
A rigid body (i.e., a 2-dimensional object) has principal moments of inertia about the centre of mass of $I_1 = (\mu^2 -1), I_2 = \mu^2 + 1, I_3 = 2\mu^2.$ I wish to show, using the Euler equations, ...
1
vote
3
answers
296
views
Angular Momentum vs. Force Due to Gravity
I'm getting my feet wet with orbital mechanics and have a very basic question. Kepler's 2nd Law shows that 2 objects in an elliptical orbit sweep out equal areas in equal time, implying objects ...
-1
votes
0
answers
18
views
Static equilibrium - center of gravity problem? [closed]
For a chair to be balanced on one leg only, where must the chair's center of gravity be located?
i thought of, for it to be in rotational equilibrium, the center of gravity has to be at the point ...
- 1
0
votes
2
answers
59
views
How can people be weightless on space station?
I had read it somewhere that on the space station, people are weightless. even though artificial gravity is created there, people are still weightless. how can this be possible if there is gravity, ...
- 31
-3
votes
2
answers
88
views
Well I dont know, what you want? [closed]
When you calculate the gravitational force $F_G = G \cdot\frac{m\cdot M}{r^2}$.
Is this equation precise for relativistic big masses, given that $m$ and $M$ do not and can not move?
If not is there an ...
- 1
1
vote
0
answers
57
views
Physics HL Nov 2022 - Hovering Aircraft: underlying problem model
This is the setup of a Physics HL paper of past year:
I would like to understand the model underlying this problem.
From the solutions I can find worked out in that video for instance, this is the ...
- 289
1
vote
4
answers
59
views
How can I factor friction into acceleration, given power?
I'm trying to work out an acceleration curve for a vehicle for a simulation, but despite a bunch of research there are a couple of things I still don't understand.
First we have $P = mav$. Assuming ...
- 147
15
votes
9
answers
2k
views
Why do we still use pseudo forces? [duplicate]
So when I was reading about Newton's laws, and my textbook (Sears and Zemansky's University Physics) gave the classic examples of when we might be tempted to create an additional "centrifugal ...
- 301
5
votes
4
answers
274
views
Addition of forces on a rigid body instead of a point
When two forces act on a point mass,we add the forces like we usually do and i have no problem understanding that. When the same forces are applied on a rigid body,how are we able to add them the same ...
- 1,021
1
vote
1
answer
47
views
Could someone give me the explanation for this scenario?
I fixed inclined wedge. I throw a ball from height say h meters above its point of impact of the inclined plane. And lets say the inclined plane is smooth (no friction) but has a coefficient of ...
1
vote
1
answer
46
views
Question in time period of oscillation of a ball in bowl [duplicate]
We know time period of pendulum is $$T=2\pi\sqrt{\frac{L}{g}}$$
While reading through a question on S.E which was based on a ball oscillating on a bowl , I was curious and I thought of its time period ...
- 472
0
votes
5
answers
89
views
Query in Newton's Third Law and friction
So My main question is about Friction in Newtons third law
Consider a box on the floor , A force $F$ is applied to it on the east direction , the floor then applies an equal and opposite force on the ...
- 35
0
votes
1
answer
33
views
Coriolis force on a person on a carousel
Good afternoon all,
I am looking at the question Running backwards on a carousel from 2020 and the accepted answer given below it. Why is there no centripetal force on the person in either reference ...
- 71
-1
votes
0
answers
19
views
How is trajectory prediction done on guided missile (which control systems for stabilization and changing trajectory) for application in Air defense? [closed]
I was just exploring ways to predict impact prediction of an incoming missile, I wanted to know how it is determined if a missile launched from a source point is detected by a radar will hit inside ...
- 19
1
vote
1
answer
43
views
Confusion regarding net acceleration of the bob in the bottommost point of the trajectory of a pendulum?
Here is my analysis from the inertial frame on it:
At the bottom most point,
$g$ acting downwards
$v^2/r$ (centripetal acceleration) acting upwards
So the net acceleration, a = $(v^2/r)-g$ right?
...
0
votes
1
answer
41
views
Problem figuring out correct sign using newton's third law [closed]
I'm having trouble interpreting Newton's third law on a block classic problem.
Considering a constant horizontal force acting on two blocks of masses $m_A$ and $m_B$ must give an acceleration of $a = \...
- 3
1
vote
2
answers
183
views
Correct explanation of tides [duplicate]
In the explanation of tides on earth there seem to be different versions for the second water bulge on the side opposite to the moon, while everybody seems to agree that the bulge on the moon side is ...
- 4,205
0
votes
1
answer
26
views
Conversion of energy of rifle and bullet
If we shoot a bullet from a rifle,do the energy we put on the rifle=rifle's backward kinetic energy+bullet's kinetic energy and sound energy(the noise from the shooting)+heat energy(if the rifle's ...
1
vote
6
answers
436
views
How does unbalanced force ever create? [duplicate]
This question rather seems elementary but has been bugging me for a while! How does even unbalanced forces create? The main driving force of this question is Newton's third law
Let's take Free Fall:
...
- 472
1
vote
4
answers
103
views
Line of action of resultant force of two parallel forces
We take a rigid body as shown in the figure and apply two parallel forces (which do not have the same lines of action) at the ends of the body. Let us assume that $P>Q$. Now as we all know
There ...
- 1,021
2
votes
0
answers
48
views
Why are we ignoring the effect of rotation of earth while equating initial and final energy in this question? [closed]
A satellite of mass $m$ is launched vertically upwards with an initial speed $u$ from the surface of the earth. After it reaches height $R$($R$= radius of the earth), it ejects a rocket of mass $\frac{...
- 203
0
votes
2
answers
43
views
When we swing a ball around in circle there is a centripetal force on the string but is there a torque also proudced in the string?
When a ball is swinging in a circular path the is a centripetal force that is provided by the tension in the string but because it is a circular motion is there a torque also proudced in the circular ...
0
votes
1
answer
60
views
Force that an axle exerts on wheel [closed]
Consider a wheel attached to an axle.
Since the torque on both must be the same:
$$F_wR_w=F_aR_a$$
$$F_w < F_a$$
because the radius of the wheel is greater than radius of the axle.
My question is: ...
- 35
1
vote
0
answers
20
views
Change in kinetic energy of mass pulley system [closed]
Imagine a pulley (with non-negligible mass) with two masses hanging from the pulley on a rope on opposite sides. One mass is accelerating downward and the other mass is accelerating upward. We assume ...
- 11
0
votes
1
answer
42
views
Help me understand power and torque [closed]
I'm trying to understand power and torque relationship in terms of cars.
Let's assume we have a four tracks with a load that needs a total of 1000N to move.
First one has 1000 Nm and 1000W
Second ...
- 1