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Results tagged with forces
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user 208138
This tag is for the classical concept of forces, i.e. the quantities causing an acceleration of a body. It expands to the strong/electroweak force only insofar as they act comparable to ‘classical’ forces. Use the [particle-physics] tag for decay channels due to forces and [newtonian-mechanics] or one of the other subtopics of [classical-mechanics] for the dynamics of classical systems.
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When we pull a tablecloth off a table with a glass on it
On doing a Google search, it says the glass stays put if we pull the tablecloth fast enough, as in, the glass does not move at all. I have seen some videos and the objects put on the tablecloth seem t …
- 14.9k
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How do I prove that this force equation is wrong? [duplicate]
According to him, if we consider the two blocks, string and pulley together, gravity on two blocks and the tension force at $D$ are the external forces. So they must equal. …
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Is it possible to determine the motion of a vehicle moving at a constant speed of $0.8c$?
Suppose you are in a rocket with no windows, traveling in deep space far from other objects. Without looking outside the rocket or making any contact with the outside world, explain how you could d …
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Why does Friction not accelerate the body in this case?
Large enough in the sense that it can not be ignored when we analyse the forces acting on the object.
This is what I can't comprehend. … The surface exerts two contact forces on the body (according to the book). One perpendicular to the surface (Normal), other parallel to it (friction). …
- 77.9k
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Free Body Diagram w.r.t a rotating reference frame
When analysing the statics of a particle of mass $m$ from a reference frame which is rotating with angular speed $\omega$, we need to add a pseudo force known as centrifugal force, apart from other real forces … on the object along with the two fictitious forces? …
- 612
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Work done by action-reaction pair of tension
I want to understand how work done by action-reaction pairs of tension forces acting on this system is zero. …
- 876
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Force equations for a particle in a non-inertial frame of reference
I am familiar with Pseudo forces and how we use them in accelerating reference frames. My question is a bit specific. … I can see (or feel) that force in my own (non-inertial frame) because individual forces are frame-independent.
Let’s say my mass is $M$. …
- 77.9k
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Friction acting between road and tyres of a car
I don’t understand a few things.
1) How did they come up with that FBD (free-body diagram) for the horizontal forces acting on the car? … I think the FBD (figure 5-16) shows the forces acting on it when brakes are applied. …
- 52.3k
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What are Inertial and non-inertial forces?
What are inertial and non-inertial forces? I looked them up.
One of the websites says that an inertial force is a force that can be observed/measured in an inertial frame. … Non-inertial forces are basically pseudo forces that we use in non-inertial reference frames? …
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Spring force in a massless spring [duplicate]
If I consider a very small section of the spring, then forces at either ends of the spring should be equal in magnitude according to the 2nd law, because the section of the spring is massless. …
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Tension in a massless string being pulled at its ends with unequal forces
But what if we pulled on the ends of the string with forces of unequal magnitudes? This question occurred to me and I kind of got confused. … My question is,
If we pull on the ends of a string that is massless and inextensible, with forces of $60N$ and $70N$ respectively, what would be the tension in the string?
Will it be $60N$? …
- 213k
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Ratio of $F_{net}$ acting on a body to its weight?
The acceleration of a body, expressed as a multiple of $g$, is $always$ equal to the ratio of the net force on the body to its weight.
What does this statement mean? Is it referring to the g-f …
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Is tension along the length of a massive rope resting on a table always the same?
Mathematically it can be easily proved using Newton’s 2nd law that tension along the length of a massive rope just lying on a table and not accelerating, is the same. But is it always the same? It sho …
- 77.9k
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Why do we call it $g$-force when it basically tells us about acceleration?
I was studying about $g$-forces. It is basically non-gravitational accelerations imparted to a body by forces acting on it, other than gravity. …
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How is the external force and the tension force related in this system [closed]
And the tension forces acting the two bodies have been shown by pink vectors. Of course the two pink vectors, i.e, the tension forces are equal in magnitude (please correct me if I am wrong). … What I don’t understand is, how is $F_{applied}$ related to the tension force $T$ acting on block B (and block A, since the two tension forces are equal in magnitude)? Is it greater than $T$? …
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