Stack Exchange Network

Stack Exchange network consists of 174 Q&A communities including Stack Overflow, the largest, most trusted online community for developers to learn, share their knowledge, and build their careers.

Visit Stack Exchange
Join us in building a kind, collaborative learning community via our updated Code of Conduct.

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.

0
votes
0answers
5 views

Trajectory Problem On Kinematics [on hold]

A ball is thrown vertically upwards in the air by a passenger(relative to himself) from a train that is moving with constant acceleration on a slope of inclination $\theta$. What will be the ...
0
votes
2answers
35 views

When I am on a moving bus and the bus stops abruptly how to cancel the extra motion due to Newtonian Law without holding steel bars in the bus?

Today I was on a City bus. And Newton's first Law hit me hard. I was standing. And the bus stopped suddenly. I fell down. Because of Newton's Law of Inertia, which states: An object at rest stays ...
0
votes
0answers
12 views

Uniform Acceleration: Pulley Problem

This situation came up in my physics lab. Assume there's 0 friction between mass m and the ground. Given some constant mass M, and you are to vary the mass m, will the acceleration of the block with ...
0
votes
1answer
72 views

What set of experiments can I make to derive Newton's laws myself?

I have read this great answer (first one) by joshphysics: Are Newton's "laws" of motion laws or definitions of force and mass? It cleared all my confusion regarding what mass actually ...
-3
votes
0answers
45 views

A question I came up with while trying to analyse another one however miserably failed to proceed any further than a square case with it [on hold]

A ball strikes the two orthogonal walls' point of intersection making an angle of 60° with the vertical. As soon as it strikes two walls are added making a square cage for the ball with sides having ...
0
votes
0answers
20 views

Time taken for an object to slide down a curved ramp (variable acceleration) [duplicate]

If given a ramp in the shape of a known function (which has a restricted domain so that the function is only decreasing), how can you find the time taken for an object to slide down that ramp.' For ...
-2
votes
0answers
38 views

Newtons laws of motion [on hold]

As far as i can judge the thread will also accelerate but i can't show it theoretically.Someone please explain through a FBD using necessary mathematics.
-4
votes
2answers
45 views

Why does the sphere not roll?

It says in the first case that the sphere never rolls. Is it possible for a sphere to not roll and just slide?
0
votes
0answers
53 views

Does power delivered by a person depend on frame of reference? [on hold]

A person lifts a block of mass $m$ to a height $H$ in time t inside the lift that is moving upwards with acceleration a and having velocity $v$ at $t=0$. Find the power delivered by the person for ...
-3
votes
0answers
29 views

Trajectory Problem On Kinematics-especially relative motion [on hold]

A ball is thrown vertically upwards in the air by a passenger(relative to himself) from a train that is moving with constant acceleration on a slope of inclination $\theta$. What will be the ...
0
votes
0answers
31 views

With respect to inertial observer standing at the starting point of why is the velocity of ejected mass of rocket $v + v_0$

We derived the equation of motion of a rocket this way: all the velocities are taken with respect to inertial observer standing where the rocket starts. As we take upwards direction to be positive. ...
0
votes
1answer
26 views

Tipping angle of a box

how do you calculate the tipping angle of a box? That is the maximum angle a which a box can reach before tipping over. help, please!
0
votes
0answers
33 views

How to calculate the radius of a curve based on vehicle wheel speeds of a car

I have data of the 4 differen wheelspeeds of a vehicle during driving time. Based on that I want to calculate the radius of a curve it is taking. The following are my current thoughts that seem to be ...
0
votes
0answers
34 views

What equation describes the path of a ball tossed in the air?

I am trying to understand a lecture on stationary action and got stuck right from the beginning. The professor says if he tosses a ball in the air it will be described as X(t) = 1/2gt( T- t). T is ...
0
votes
2answers
54 views

Question about the Normal Force exerted by Planet Earth in relation to centripetal force

I have the following question based on a paragraph from my Physics textbook (I am translating, so the result might not be the most elegant): It states that due to the centripetal force resulting from ...
0
votes
2answers
33 views

Velocity of a ring tied to an inextensible rope

In the diagram, the pulley is weightless and friction less and the thread connecting the pulley with the ring is inextensible. The thread is attached to the ring which in turn can move only ...
0
votes
0answers
36 views

How does Earth's rotation affect long range shooting trajectory? (Coriolis and Eötvös effects)

I know that this has been a well discussed topic on the internet and I read a lot about it, and yet, I still have some doubts. I'm talking about Coriolis and Eötvös effect. Let's start with Coriolis ...
-1
votes
0answers
16 views

Gyroscope calculation

Is it possible to calculate rpm of a gyroscope based on the mass of a gyroscope and the force that acted on it? Let say the mass of the gyroscope is 1 kg, and the force is 5 torque. Is there any ...
1
vote
2answers
57 views

Conservation of energy when dropping a ball

If we drop a bowling ball from one meter above the earth's surface, we are converting its gravitational potential energy to kinetic energy. When it hits the floor, it transfers its kinetic energy to ...
-1
votes
1answer
42 views

Why is velocity in an uniform circular motion constant and is there a costant accelleration due to the variation of direction of the velocity?

In an uniform circular motion in which the transverse component of the velocity varies due to the change of direction of the radius vector r (t) and the radial component remains constant, for which ...
-5
votes
0answers
18 views

Kinematics influencing work, power ,energy [on hold]

An unloaded bus of mass $m$ and a loaded bus of mass $2m$ are having same kinetic energy. Brakes are applied to both, so as to exert equal retarding force. They covered $x_1$ and $x_2$ as distance ...
0
votes
1answer
21 views

Real Time Tension Measurement of a string

For a cable-stayed bridge, I have come across some papers where it is mentioned that the tension is varying in real time. I was just wondering why the cable tension is changed? (All the derivations I ...
1
vote
2answers
47 views

Relativistic speed Ion engine

I'm a newbie so this might be obvious to others but....if the specific impulse of an ion engine is limited by it's fuel load then why not accelerate singular fuel (krypton) ions to relativistic speeds ...
1
vote
1answer
30 views

Force on individual membrane points

I am working on the dynamics of a membrane under various forces. My membrane is made up of discrete points $(x_i,y_i)$ with $i = 1,2,\cdots n$. I can model the total energy of the membrane as made up ...
3
votes
1answer
47 views

Is this a valid way to derive conservaton of momentum?

So i’ve just been considering some basic things, and i wanted to make a quick way to show conservation of the total momentum of a system occurs under the collision of two objects. Consider force, ...
1
vote
3answers
49 views

Internal and external forces

When a person lifts a book while standing on the earth's surface. Why is his force considered external to the book-earth system? Isn't his force internal like the case of the forces that cause the ...
0
votes
1answer
15 views

Determining the direction of a force with a dynamometer

I'm taking what is usually called "freshman's" mechanics course, and I'm basically trying to understand how forces are measured and determined. Starting with the definition of the procedure for ...
0
votes
2answers
25 views

Role of friction in circular motion

If a body is moving in a circular path, then, why do we take The direction of friction towards the centre of circular path and why It is static friction
-1
votes
1answer
23 views

Spring-Block system [on hold]

Here is a multiple spring and a block system. I need to find the maximum elongation of the spring. I tried to take $mg-(k_1+k_2)x=0$, and find $x$ from there. The answer is coming wrong. It should ...
-1
votes
2answers
34 views

Maximum tension in a rope [duplicate]

Lets say I have a siccative object that’s attached to a rope and it’s moving in a vertical circular motion around some circumcenter. If along the motion the rope will happen to reach maximum tension, ...
-4
votes
1answer
33 views

Maximum force in tug of war

In tug of war, The maximum force that a person can exert on the rope depends on the static coefficient of friction. Is that correct?
1
vote
0answers
29 views

Conservation of angular momentum in a rod with hinge on one end

Consider the case a rod with hinge on one end in horizontal position. At the instant when it is released, the weight of the rod is going to give it a torque with an acceleration. Why is angular ...
1
vote
1answer
35 views

Force and momentum of water striking a water wheel?

Imagine water striking a water wheel. We can find the torque applied by calculating the force of the water and multiplying by the distance from the center. To calculate force, we can use the formula ...
-3
votes
0answers
27 views

Find the acceleration time of a car [on hold]

So given the power, mass, and distance of a car to travel i need to find out how long it will take. Power is 84HP mass 200kg and distance is half a mile! I've tried my best and can't figure it out! ...
0
votes
1answer
26 views

What force does the dynamometer show in this case? [duplicate]

So I came across this picture on facebook My logic says it should show 200N, because you are pulling it with 100N on each side. On the other hand (as one of the facebook comments also stated, also ...
0
votes
2answers
48 views

Overcoming the inertia of a body at rest

Neglecting friction and other forces (air resistance) and assuming all forces are orthogonal the gravity vector , consider a large dense sphere at rest on a perfectly flat plane which is plumb. Now ...
0
votes
2answers
45 views

Friction and Motion

We know that the frictional force always opposes the relative motion. Recently, I happened to read somewhere that "It is the frictional force which causes a car to accelerate on road". My question is ...
-1
votes
1answer
46 views

Can a tunnel through a planet be used as a power generator?

Assuming that it were possible to do so, if a tunnel from one side of a planet to the other were lined with copper wire, could dropping magnets down the hole be used to generate power?
2
votes
3answers
63 views

How do we know that the motion of the particle in an central force field lies on a plane?

If I take r as the radial vector of the moving object and v as the velocity vector of the moving object in central force field. Then r should be perpendicular to r×v . So that depicts that r.(r×v) = ...
-2
votes
0answers
50 views

Pendulum on stand without friction [closed]

Pendulum is on a stand. There is no friction between the stand and the ground (and no air friction). Mass of stand is double the mass of pendulum bob. Length of rod is 0.3 m. Calculate speed of stand ...
-2
votes
0answers
17 views

İmpulse of tension during swinging [on hold]

A mass m connected to a rope which is fixed to ceiling is released from horizantal. Find the impulse applied by the tension till the mass comes to horizantal.
47
votes
4answers
13k views

Why is the shape of a hanging chain not a “V”?

From Wikipedia: To answer this question: "What is the shape of a chain suspended at both ends?" we can use the variational principle that the shape must minimize the gravitational potential energy. ...
-1
votes
0answers
26 views

Can kinetic energy and potential energy or other similar quantities be considered multivariable functions?

We know that kinetic energy is mathematically represented as $$E_k = \frac{1}{2} m v^2$$ Similarly, potential energy is defined as $$E_p = mg\Delta x$$ Considering these mechanical quantities in a ...
1
vote
3answers
38 views

A slipping cylinder comes into contact with friction

Suppose a cylinder is slipping rigidly on a frictionless horizontal surface. Then, at $t=0$ it reaches a different ground. The coefficient of friction between the cylinder and this new type of ground ...
51
votes
14answers
11k views

When a balloon pops and lets a brick fall, where does the energy come from?

Let's say a scientist attaches a 1 kg brick to a large helium inflated balloon, lets the balloon go, and then it reaches an altitude of 10 000 meters before it pops, dropping the brick. The brick ...
0
votes
1answer
27 views

Two-particle system: proof force on each particle can be derived from one potential energy

Suppose we have a two-particle system with particle 1 and particle 2 that obeys Newton's laws. Further assume that the force on particle 1 due to particle 2, $F_{1, 2}$, is conservative. I know then ...
1
vote
1answer
49 views

Magnetism and reactionless drives

I have a question regarding the interactions of electromagnetic fields. Say you have two superconducting electromagnets A and B. The properties of the magnets are known such that you can tell ...
-1
votes
0answers
43 views

Calculating ringworld self-gravitation

I have built a ringworld calculator that gets around lack of strength by adding in a non-rotating counterweight to balance the force applied by the spinning habitable ring. For small rings with ...
-1
votes
0answers
50 views

Dynamic question [closed]

In a welcome triumph of technology, Canada shoots its three federal party leaders far into space.Scheeridan, TrustDuh, and SingASong have identical masses of 80.0 kg and they are tied together with ...
0
votes
2answers
48 views

Total energy of an object in motion in free space

In order to impart motion (additional motion) to an object in free space, inertia "soaks up" an given amount of energy prior to additional movement, which is related to its mass, irrespective of any ...