# 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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### Will a tennis ball tossed straight up in a airplane cabin move towards the tosser or will its distance from the tosser remain the same?

If I am in a pressurized airplane cabin and I toss a tennis ball into the air, will the ball move towards me? My thinking is that though the ball is in an air bubble that is moving as a whole at the ...
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### Distance and time contrasting results

I know the thing I am missing is right in front of my eyes, please help me see it, I see this equation $x_{final} = x_{initial} + v_{initial}t + \frac{1}{2}at^2$. I want to find the free fall distance ...
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### Calculating the time to perform work on rolling shutters

I have rolling shutters, e.g.: I am trying to determine how much time it takes to raise/lower the shutters a specific amount. (Because of the physics involved, the time is non-linear relative to the ...
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### What happens when a point mass reached Centre of Gravity of another body?

Suppose a body is slowly descending in a downwards firing rocket, in a tunnel dug through Earth's surface, and switches off the rocket just as it reaches earth's COG. Now since the body reached the ...
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### How to calculate energy required to rotate a cube?

I would like to apply force instantaneously at point $F$ in the given direction on cube $A$ and have it rotate around point $C$ to end up in the same position as cube $B$. How would I calculate the ...
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### If I saw two gears turning in front of me, how would I know which of the two has its own turn?

If I saw two gears turning in front of me, how would I know which of the two has its own turn? In other words, one gear rotates another static gear. How do I know which gear has its own movement?
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### What does Newton mean by 3 kinds of centripetal force?

In his book "Philosophiae Naturalis Principia Mathematica", Newton writes in Definition V The quantity of any centripetal force may be considered as of three kinds; absolute, accelerative, ...
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### How can we add torque acting at two different points? [closed]

How can we possibly add the torques acting at two different points?
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### Why does ground reaction force decrease at the start of a vertical jump?

I don't understand why reaction force would decrease at the start of a countermovement jump. I've tried looking at this diagram and considering moments and how lowering the position of the center of ...
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### Why should angular momentum be conserved in this case?

Consider two disks (not friction-less) with some moment of inertia ($I_1$ and $I_2$). Both of them are given angular velocities ($\omega_1$ and $\omega_2$) both in same sense. Now if we bring both ...
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### Spring block system on a rough surface [closed]

Suppose we have a given a block of mass m connected to a spring of spring constant k and kept over a rough horizontal surface having coefficient of friction u.Initially the spring is compressed by d (...
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### Theoretical question about velocity and acceleration

Imagine you have a ventilator that is spinning madly an creating strong air up force upwards. Then you put in the middle with a holder a paper ball. Then some-have detach the paper from holder. Sure ...
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### Calculate ball speed and direction from forward angular speed and sideways force [closed]

I have a mounted arm with a ball attached to the end. It has a potentiometer that de-facto measures the angle between the arm and and the mount. below the ball is a newtonmeter (actually a weight ...
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### What do force extension graphs for springs show?

Say for example a 4N force is applied to a spring. The spring's restorative force will increase from 0N to 4N until the spring is in equilibrium. Throughout this time the resultant force acting on the ...
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### Does static friction do work on an accelerating car? [duplicate]

I have seen several questions about this on this site and quora and there seems to be no definite, unanimously agreed upon answer. Does static friction do work on an accelerating car. Heres what i ...
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### Impulse by Tension [closed]

Suppose One end of a string is tied to a wall, and the other to a ball(mass $m$). Suppose the Ball is imparted a velocity which has two components: One away from the wall ($v_1$), and one ...
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### Why does a ping pong ball bounce higher when it is dropped together with a cup of water?

Setup: an official ping pong ball is floating inside a party plastic cup filled with clean water, which is then dropped from a certain height onto a soft mat. Observation: the ping pong ball shoots up ...
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### Calculate the magnitude of the acceleration due to gravity including its uncertainty?

I made a free fall time experiment and now I'm trying to make a report. The experiment consists of releasing a steel ball from various heights hi and measuring corresponding free fall times τi . ...
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### How to make a object stay under water?

How to make an object submerged under water? Neutrally buoyant? Thank you
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### In which direction will the friction act?

Suppose a block of mass $1$ kg is kept on a rough horizontal surface. Let the friction coefficient be $0.2$. Now let's say, I apply a force of $1$N in the east direction. Friction will act in the ...
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### How does waves transfer energy forward

I'm teaching a O-level physics student (grade 10th). We were talking about waves and she asked this question, how does waves transfer energy forward if the molecules just moving up and down? How does ...
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### Will the tension be the same throughout a massless rope?

If a mass is suspended from the ceiling by a massless rope, will tension be the same at all points on the rope?
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### Why does a bike skids on the sand?

Whats the theory behind bike skidding on the sand? Is it related to friction and if then why it skids. Is that the sand has more friction if so then pedaling should be difficult rather than skidding.
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### Newton's 2nd law for rolling motion with changing moment of inertia

While writing an answer to this question, I encountered a puzzling conceptual problem when applying Newton's second law for rotation about an instantaneous axis of rotation when the moment of inertia ...