# 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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### What is the need of acceleration?

As we can usually predict the various forces that a body might be undergoing based on its position and its velocity.Hence what is the need of acceleration?
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### Understanding the geodesic equation in a Wikipedia article

I was reading this Wikipedia article which attempts to motivates some concepts key to General Relativity in the Newtonian setting first. However I was not able to understand one of the equations ...
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### Determining circular velocity of an object in a sphere from gravity

The radius of a sphere is $12$ m. An object is circulating around the sphere such that it is touching the edge of the sphere and close to the bottom such that its radius is 9m. As it slows down, the ...
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### Discussion regarding work done?

Let's consider a very basic physics problem involving pushing a block with a frictional force. These kinds of problems are common in introductory physics textbooks—but they often miss some subtle ...
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### Why are you accelerating yet remaining at a constant speed while going around a curve? [duplicate]

We have to write a rap in physics, and it has to answer a prompt he gave us on this packet. The prompt for the verse I am writing is: Pretend you are driving a car on the freeway going 65 mph. The ...
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### Direction of friction in pure rolling

Suppose a disc or a sphere with uniform mass density is purely rolling without any slipping/sliding on a ground having friction. Will there be friction acting on the disc/sphere? If yes, what will be ...
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### What is the true quantitative definition of “force”? [duplicate]

Newton's second Law of Motion states that for a point mass, $\vec F = m \vec a$. This is a law and not a definition. So, this law only makes sense if all the physical quantities appearing in this law ...
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### Displacement of string and simple harmonic motion

If the displacement of a string follows $$y(x,t) = A \sin(kx - \omega t + \phi_0)$$ how can I show that the "hand" generating the wave must be moving vertically in a simple harmonic motion? ...
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### Angular velocity in Body-fixed frame and space-fixed frame

When we solve for a free symmetric top we find that in body fixed frame, the angular velocity precesses. My confusion is regarding the calculation of omega in body frame. When i am in the body fixed ...
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### How do you calculate how heavy you feel from negative g forces?

My physics tacher told me that to calculate the weight that you feel from negative g forces you have to devide your mass by the negative g force, but then my friend told me that it did't make sense ...
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### Work done by force with changing angle [on hold]

There is a 20kg block attached to a spring which is released from rest. The initial elongation of spring is 1 m. Its being pulled by constant horizontal force of 50N. We have to find its velocity in ...
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### Why is resultant displacement in an composition of simple harmonic motion the sum of individual displacements?

I recently came across the concept of the composition in simple harmonic motion. A paragraph says that: If $$x_1 = A_1sin(\omega t)$$ $$x_2 = A_1sin(\omega t + \phi)$$ Then, the resultant ...
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### “Newtonian limit” property of special relativity

Books say that special relativity is indistinguishable from Newtonian mechanics when the speed of the primed frame ($v$) is small compared to the speed of light ($c$). This is what I mean by the "...
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### Can you get a playground to swing from stationary

I feel this might be a FAQ but I would love a definitive answer. Imagine a frictionless stationary idealised child's playground swing. If you are sitting on the seat of the swing, is it possible in ...
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### Will a can filled with vacuum move when we let in air? [duplicate]

This picture is from L.C.Epstein's book Thinking Physics. The upper can is filled with compressed air, and, when an opening is made on the right, the air comes out and the can shoots left. The ...