# 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 concepts, use [classical-mechanics]. For Newton’s description of gravity, use [newtonian-gravity].

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### How come $X^2$ is a physical function?

This might be a very dumb question. When we use values that are lower then one in lets say, the expression for kinetic energy - $\frac{1}{2}MV^2$, (for example $V=0.9\frac{m}{s}$ or $V=0.8\frac{m}{s}$...
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### Work and energy: conceptual doubt

Suppose I am sliding a block very slowly on a rough surface. If the block has travelled $d$ distance then work done by me is $W_1=\mu mg d$ and that by friction is $W_2=-\mu mg d$. Now the energy ...
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### Car moving on the hill (circular motion) [closed]

I have the following question which makes no sense to me: Car is moving at $20 \;\text{m/s}$ speed on the road. Curvature radius of the hill is $R = 100 \;\text{m}$. What is the maximum possible ...
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### Trying to find constant of motion formula [closed]

I have a ball that oscillates around a point. The ball have an origin and a destination (the point where the screen is touched). This destination is the equilibrium. One operator gave me this equation ...
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### Is “non-inertial” frame a relative term?

I've heard only two definitions of non-inertial frame so far: I. A frame that is accelerating with respect to an inertial frame. II. A frame where Newton's Laws are invalid. Let's begin with ...
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### Could you determine if you were moving when standing on an infinite, frictionless plane?

I'm quite curious to know about this question. I don't really fully understand how inertia works so I couldn't quite put this one together in my head. As far as I know, if you are moving in empty ...
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### How to find the momentum of an object at time $T$ when velocity is not given? [closed]

I tried finding the change in momentum which is force x change in time. Here, I assumed the final momentum would be equal to change in momentum as since at $t= 0$, the object is at rest. However, I ...
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### Angular vs tangential vs centripetal acceleration of a non-rotating object [closed]

I was presented with a physics problem which asks to determine the maximum angular acceleraion. Unsure of how to do this, I did some research and came across the terms angular, tangential and ...
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### Stuck with this problem. Is the resultant velocity when the swimmer is going along the river just the resultant velocity of swimmer and river itself? [closed]

Here, I tried to find the resultant velocity when the swimmer is swimming perpendicularly with respect to the speed of the river. However, I got option C, which was not the right answer. Is there ...
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### Hooke's Law and work done [closed]

The formula for potential energy of a spring is $(1/2)kx^2$, with $k$ = spring constant and $x$ = displacement. This is the integral of Hooke's Law, $F = kx$. My understanding is that given a ...
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### Common assumptions in simple physics questions [closed]

I have the following problem which specifically asks me to assume and justify additional information. I was wondering if there were common assumptions across simple physics problems like this that I ...
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### Classical mechanics spring block system [closed]

Two blocks of mass $m_1$ and $m_2$ are attached at the ends of an ideal spring of force constant $k$ and natural length $l_0$. The system rests on a smooth horizontal plane. Blocks having mass $m_1$ ...
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### Deriving Newtonian Gravity from General Relativity? [duplicate]

Let me provide some insight, I was studiying about General Relativity, and I read that it "encapsulates" Newtonian Gravity. I understand this perfectly, because, Einstein used lots of ideas ...
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### Why the path of a balloon left untied is unpredictable but of a rocket is predictable? [duplicate]

When a water rocket is projected, it goes in a specific trajectory. But when a balloon is inflated and left untied, it does not follow a definite path. It goes in a random way. I do not see any ...
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### Discuss the possibility of using force rather than mass as the basic quantity. (Kibble, Classical Mechanics)

I'm starting first year in the Autumn and I'm doing some pre-university maths and physics. One of the questions I had a go at doing was this one, from Classical Mechanics by Kibble: Discuss the ...
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### SHM of a block attached to two springs and two light pulleys [closed]

The question I have is shown in the figure below: (Please note that all pulleys are ideal and massless). I have tried this question for a bit, and I'm attaching my work below. But the answer for the ...
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### Measuring work by lifting cable with constant weight

At calculus - an intuitive and physical approach by Morris Kline(2nd edition) 143p, A cable weighing 2 pounds per foot of length (and so having a mass of 2 pounds per foot) is suspended from the top ...
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### Non-inertial reference frame, a pendulum in an accelerating car [duplicate]

Take a pendulum that is suspended in a car; it hangs from a rope in a car. When the car starts to accelerate with acceleration $a_0$ to the right, from an inertial frame, Why does the pendulum move ...
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### Really understanding Newtonian mechanics [closed]

I absolutely abhor the way in which physics is taught at school. All they really do is prepare you for doing physics problems, making little effort to impart an actual understanding of the subject ...
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### Physics of Formula 1 [closed]

I'm a second year student in Engineering and a big fan of F1. I was wondering if there were any books to understand, from a physical and scientific point of view, how an F1 car works. I'm not looking ...
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### Reaction force cancels out? [duplicate]

Lets say Im pushing on the wall with a force of 1N. According to newtons laws the wall will push me back with a force of 1N. What I dont get is that my hand already has this 1N of force meaning when ...
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