# 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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### Acceleration of a sphere with cavity in the incline

Does the object in the figure above undergo an uniformly accelerated motion? (Let's assume that the object rolls without slipping, ignore $\theta$) I tried to find acceleration using free body ...
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### Equations of motion: Calculate location of point [closed]

The scenario is that a user is dragging an object on a touchscreen. I want to calculate the position of the object as the finger drags it across the screen. I also want to account for any acceleration ...
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### How to calculate the launching velocity when there is gravity to be considered?

I think i got very close to the Solution. First, i had to find the velocity at which the ball is launched. I used energy Conservation formulas and find that. But the expression of the velocity was ...
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### How to understand Newton's law of universal gravitation?

Hi I am a high school physics student and I am currently struggling to grasp the concept of Newton's law of universal gravitation. I am really confused with how this works. So do all objects attract ...
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### Moment of impulse simple problem. (have answer, need to find a way to do it) [closed]

Problem is: "Flywheel is rotating with frequency of 20 Hz, where it's angular momentum is equal to 2000 kgm2/s. When angular momentum stops, flywheel stops after 1000 revolutions. Find moment of force ...
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### Way to reduce lateral movement of a rod when trying to calculate the mass moment of inertia using bifilar pendulum?

Basically I'm trying to measure the moment of inertia of a hollow rod using bifilar pendulum. I will rotate the rod, and measure the period, and use the written formula to calculate the moment of ...
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### Determining acceleration in order to meet a space-time-velocity reservation

An Example A train on a single line track is told to be at position $x_{res}$, at time $t_{res}$, and to be moving at exactly $v_{res}$ when it hits that point. Where $_{res}$ denotes the reservation....
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### Acceleration and tension [closed]

If block A (weight 200kg) is being pulled at a 20 degree angle by block B (weight 2000kg), blck B has a pulling force of 3000N & (friction of block B=1500 / block A=1000) what is the acceleration ...
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### Prove: angular velocity does not dependent on the vector stay fixed with the rigid body

From definition of the angular velocity of a rigid body: $$\frac{d\vec c}{dt}=\vec \omega \times\vec c$$ with $\vec c$ is a vector fixed in the rigid body. Now, choose a different vector $\vec a$ ...
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### Why does a falling ladder $y$ component force greater than the $x$ component force?

I have a ladder at 30* against the smooth wall and it accelerates down and to the left when it falls to a rough ground. It also pivots at the bottom. I understand that the the force of gravity is ...
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### Finding the minimal radius of body in elliptic motion

Assume I have a body with mass $m$ with particular velocity $v_0$, that is is being pulled by a radial force which is linearly proportional to the radius $r$, which is the body's distance from the ...
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### Is there an equation that relates angular acceleration to centripetal acceleration? Tangential to centripetal?

Is there an equation that relates tangential and centripetal acceleration? I ask this question because it's been on my mind ever since I solved a problem involving the giant swing ride commonly seen ...
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When releasing two balls from a Newton's cradle, both with mass $1 kg$ and velocity $2 m/s$, they have momentum $4 kg m/s$ and kinetic energy $4 kg m^2/s^2$. Assuming elastic collisions, these will be ...
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### Moment of force about a point definition

In defining the moment of a force about a point as "the tendency of one or more applied forces to rotate an object about an axis [going through a point, hence also about a point]", I see it logical to ...
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### Is there any physics book like Newtons principia mathematica?

Firstly that it is practically undecidable whether it's a math or a physics book due to its elegant formal mathematical style despite being about the natural world. Secondly no coordinates, not even ...
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### Is there a difference in energy walking with and against Earth's rotation?

If the amount of energy required to accelerate an object is dependent on an object's speed, and the earth is spinning, shouldn't take more energy to walk with the earth's rotation rather than against ...
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### Could we make a orbital kinetic strike weapon big enough to destroy a city? [closed]

i was playing call of duty ghost recently and i realized they were using a kinetic orbital strike weapon and i was just wondering if it would be possible and effective at the same time I've watched a ...
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### Does “inflation” eliminate the requirement that the big bang distributed an infinitely dense kernel of mass?

My admittedly limited understanding of the big bang is that it was an event that expanded spacetime itself along with the kernel of infinitely dense material that coexisted at the moment of the big ...
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### On force being directly proportional to the rate of change of momentum [duplicate]

Newton's second law says that $F_{Net}=\frac{dp}{dt}$. I do realise that when the net force on a body is zero it keeps its current velocity, so one can infer that the force is somehow related to ...
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### Gravitational Oscillation and Kepler's Third Law [duplicate]

I want to figure out the motion of a comet that can somehow pass freely through the sun (mass much, much greater than the comet's so that its movement is negligible) if it starts out stationary ...