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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What is difference between anisotropy and inhomogeinity of this type of composite material?

I am studying some types of composite materials having 2 phases - fibers and matrix. I have some questions and confusions. Any help is appreciated. The composite has fiber along length and I am ...
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Block on an inclined plane, spring at bottom of incline [closed]

Problem: A block of mass $m = 5.00kg$ is on an inclined plane with an angle $\theta$ = 16.26 degrees with respect to the horizontal. The coefficients of static and kinetic friction are: $\mu_{k}$ = ...
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53 views

Spring on a cart problem [closed]

The problem is two dimensional. At t = 0, a stationary cart at initial position (0,0) starts to accelerate with acceleration a in the negative "x-axis" direction. On the cart, there is an isosceles ...
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175 views

Quantum explanation of Newton's Third Law of Motion

Newton's law states that for every action there is equal and opposite reaction. This law explains how rockets fly in space and accounts for the the majority of the lift action generated by a ...
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Variable mass dynamics: Particle and Rigid Body

I'm encountering some issues in the understanding of some basic concepts about the dynamics of variable-mass particles and rigid bodies. For what I found, for example reading On the use and abuse of ...
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32 views

Will the particle reach other end?

I place a container at rest in vaccum and filled it with air (STP conditions). Suppose a moving particle(sphere of dia 2mm) is placed at one end of the container without disturbing anything, will ...
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Theory books for physics upto Irodov level [duplicate]

Problems in Physics by IE Irodov is a very popular book amongst students for problem solving. It has very good problems. However, most of the popular high-school physics textbooks like Resnick ...
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79 views

How torque and friction cause wheel to roll

I apologize if this question has been answered before, but I did not find the explanation that I needed. If a torque is applied to a wheel situated on a frictional surface, what forces cause the ...
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19 views

Is there an applied force acting on the balloon? [duplicate]

A long string is running through a straw with a blown-up balloon taped onto the straw, and a penny taped onto the balloon. There should be a support force going up, gravity going down, friction force ...
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24 views

How are Newton's Laws of motion related to the amount of work exhibited by the balloon vehicle? [closed]

A long string is running through a straw with a balloon taped onto the straw, and a penny taped onto the balloon.
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35 views

Mach's principle in empty universe, centripetal force and violation of Newton's laws of motion [closed]

Questions about Mach's principle and empty universe has been asked many times but nowhere can I find it's cross examination with centripetal force. From my point of view the simple logic of ...
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2answers
59 views

Will a person experience micro or zero gravity inside an aeroplane in free fall

Let us say that a person is inside a stationary aeroplane being held by a stationary helicopter in the sky. Now, the cable which supports the aeroplane breaks. Thus the aeroplane is now not bound by ...
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2answers
106 views

Perspective and changes in kinetic energy

Say you have two planes flying next to each other at the same speed and one decides to pick up speed by burning a tank of rocket fuel. If someone on the ground wanted to know that plane's new speed ...
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27 views

How to find amplitude?

What are the general methods of finding amplitude in various cases of simple harmonic motion containing spring block system? I always try with the basic sine formula of SHM to find amplitude.
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Friction Between Liquid and Solid Surface

How does friction between liquid surface and solid surface differ from viscosity, the friction between liquid and liquid surfaces? Also has a word describing the process been invented or is ...
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1answer
39 views

Conservation of momentum 1-D problem: track is not level

This problem is a standard kind of 1-D problem. You have 2 equal carts approaching each other and collide on linear air track. BUT the person setting up the track did NOT do a good job at making the ...
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0answers
15 views

What is the minimum velocity an object needs to hit a vertical hanging rod with, so it it can make a revolution? [closed]

The Rod is handing vertically, Attached to a firm end. An object of mass m hits it with velocity v, so what minimum value does v should have so this rod can rotate about its pivot?
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591 views

What is the physics of a spinning coin?

When we spin a coin on a table, we observe 2 things: It slows down and stops after sometime. It does not stay at just one point on the table but its point of contact with table changes with time. ...
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2answers
22 views

Damping Constant for a Ball Rolling in a Bowl

How would you find the damping constant of a ball rolling without slipping in half of a sphere? I know how to find the period of the oscillation, but how would I find the damping constant ...
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What is the radius of the circular orbit? [closed]

Find the radius of the circular orbit of a satellite moving with an angular speed equal to the angular speed of Earth's rotation. I started with the relation of time period ad the radius.
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28 views

What is the true weight in the geostationary satellite? [closed]

What is the true weight of an object in a geostationary satellite that weighed exactly 10.0N at the north pole? I did: At north pole the weight of the body is 10 N. Therefore the mass of the body is ...
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1answer
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Can we measure kenetic energy on an absolute scale, or does it have to be measured with reference to something else?

I recently read the question Kinetic energy of an object at rest where it was suggested that the kinetic energy of an object on Earth is measured in the reference frame of Earth. Can we measure ...
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32 views

kronecker product of representations on SU(2) group [closed]

We know that if we have two irreducible representations, their product is in general reducible : $$T^{\mu}\otimes T^{\nu}(g)=\oplus \sum_{\lambda}c_{\lambda}T^{\lambda} (g)$$ where $c_{\lambda}$ is ...
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Will a heavier or lighter tank shell / bullet/ etc. travel further given the same starting energy?

Let's say I have for example two tank shells, both being the same size and having the same shape. Let's say the starting energy is 100kg*m/s^2, and the one shell is 1kg, the other 25kg. 1kg * ...
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Parabolic motion exercise [closed]

From the top of a building, when t=0, a ball is thrown with a speed of 50m/s, forming a 30° angle over the horizontal. The ball hits the street, wuth a 40° angle below the horizontal. Find: a) Time in ...
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Car driving / falling off of a cliff - will it land upright?

In a recent episode of The Walking Dead, a van was pushed off of a bridge and flipped once and landed upright, on all four wheels. Assumption: the ground and cliff are both flat. Will a vehicle ...
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1answer
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Coupled ODEs that model a quad rotor

I am working on modeling the vibrations of a quad rotor. The arms that support the rotors are fixed to a center plate; that is, it is pretty much a cantilever beam with an end load. Since this is the ...
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Kinetic energy of an object at rest

Why don't we consider that an object on Earth has kinetic energy as it is also moving at the rotating speed of Earth?
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17 views

Maximum velocity on Unbanked roads and why should friction be more than centripetal force? [closed]

Why is maximum velocity on unbanked circular road given by $\sqrt{urg}$ where $u$ is coefficient of friction, $r$ is radius of circular track and $g$ is acceleration due to gravity? Why should ...
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5answers
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Build a ring around Earth, then remove the supports

What would happen if we decided to build a giant ring that managed to wrap around the whole world, end to end that was supported with pillars all along the ring and then the supports all suddenly ...
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6answers
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Newton's cradle

Why, when one releases 2 balls in Newton's cradle, two balls on the opposite side bounce out at approximately the same speed as the 1st pair, rather than one ball at higher speed, or 3 balls at lower ...
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28 views

Centrifugal force on a space station - how many RPM? [closed]

What is the RPM needed to have 1G simulated gravity on a cylindrical space station that is 1000 meters in diameter? What is the equation to calculate that? [edit] I know that in this case it's the ...
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When an object moves downward, is its height negative?

The question is: A ball is thrown directly downward with an initial speed of 8.00m/s from a height of 30.0m. After what time interval does it strike the ground. So I went through the problem ...
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142 views

Tension in string and gravitational force on bob relative strength

When calculating time period of simple pendulum (an approximation of SHM at small amplitudes) we take gravitational force greater than tension in string and resolve gravitational force in two ...
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Relative acceleration: frame of references

There is a question I've been struggling with, and I ask for your help to understand it fully. Q: An inclined plane, fixed to the inside of an elevvator, makes a 32 degrees angle with the floor. A ...
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How fast would someone have to run to travel vertically up a wall?

I am currently doing a physics project on the effects of so-called 'super-speed'. I was wondering how fast you would have to run to vertically travel up a wall? That is, to negate the force of ...
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1answer
40 views

Estimate the maximum distance of water spatter

There is a faucet dripping water from height $H$ onto a smooth, horizontal ceramic surface, and I need to give a upper bound of the maximum distance between the water spatter and the point directly ...
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114 views

Rolling a ball into a cone; what should the forces overall be?

This is my solution to finding angular displacement/velocity/acceleration on cone so far. Consider a cone, with an apex of half-angle $\psi$ pointing down, and a height of $h$. If I roll a ball into ...
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2answers
119 views

What motion can emerge in a still universe? [duplicate]

I consider a very large non homogeneous cloud of dust in isolation. No external gravitational interactions. It is initially completely still and start collapsing under the its own gravity. Can the ...
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29 views

Angle of throwing a ball in a train moving in an arc [closed]

Suppose a man is standing in the middle of a train car, when the train is riding with speed $V_T$ on a track section with circular curvature of radius $R$. The man wants to throw a ball with velocity ...
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Liquid placed in a rotating cylinder

The Question A closed vertical cylinder is filled with an incompressible liquid of mass m completely. The cylinder is now sealed from all sides and rotated about ...
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Calculating the moment of inertia in bifilar pendulums

I'm an A2 student, and I've been looking into how experimental and theoretical determined mass moments of inertia differ. I came across a method (search Youtube for Measuring Mass Moment of Inertia - ...
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1answer
102 views

Movement of a cylinder filled with water

Not long ago I was pretty bored at a dinner and I started playing with a water bottle that was not empty: I've been quite interested in its behavior when putted on its side and pushed: the bottle of ...
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How does live load versus dead load effect roof slip-resistance testing?

I have tested a wide variety of roofing materials for slip resistance in a range of roof slopes using various boot outsole materials. With all test protocols, equipment, and conditions being equal, ...
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2answers
119 views

Deceleration rate of objects of different mass but the same otherwise

Using a tennis ball as an example object, if one ball weighs 1 ounce and the other is 2 ounces, and both are struck at 100 mph on the same trajectory, would there be any difference in the deceleration ...
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Question about massive spring and SHM [closed]

A mass $M$ is resting on the end of a spring with constant $K$. The mass of the spring is $m$, and the displacement of each element of the spring is proportional to the distance from the fixed end ...
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Sliding Atwood? Moving Stoplight? [closed]

This version of an Atwood machine has two posts, separated by a known distance, with pulleys at the top. Running over the pulleys is a string of known length with three different masses: one on an ...
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Relating Angles in Elliptical Orbit

I've been trying to model the orbit of a comet of arbitrary mass around our sun from having a known initial condition with $r_0, v_0$ with angle $\alpha$ at $t_0$ around our sun. I've been able to ...