Questions tagged [free-body-diagram]
A pictorial device which analyzes forces present on any body with the use of vectors. Allows easier grasping of problems involving either objects at equilibrium or in motion. Can be used to predict presence of forces.
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If work done by hinge force on a hinged rod is 0, then why is there a hinge force at all?
Consider a rod hinged at one end, and free in the other, initially, the rod makes a 30° angle with the horizontal axis through the hinge, it is then allowed to fall.
I was told, that energy could be ...
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Person holding two persons hanging over the edge and centre of mass inconsistency
Imagine a person holding the leg of the person in front that also holds the person in front of him. (over the edge like in MI4, assume centre of mass of second person with feet still on the floor is ...
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Rope sliding from frictionless surface inconsistency [closed]
Imagine a rope that has a mass lying on a frictionless table and one part of it is hanging over the edge. I know that if there is no friction it does not matter how much of the rope is hanging over ...
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What are the forces that do work when a spring between two masses pulls inwards?
Two masses (indicated as 1 and 2) of value $m$ are connected by a spring with an elastic constant $k$ and a natural length $l_0 = 0$, as shown in the figure.
Initially, the two masses are separated ...
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Mechanics and constraint relation [closed]
Please solve this mechanics problem .
I couldn't derive the relation of extension of cords
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A bird in a container [duplicate]
Suppose there is a bird in a sealed container, and the container is on a scale that measures its weight. The bird is flapping its wings to hover in the middle of the container. If the bird flaps its ...
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Implications of massless pulleys in Atwood machines
Consider the double Atwood machine below:
I understand the classic approach to a solution for the acceleration of each mass involves setting the tension in the upper string equal to twice that of the ...
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How to resolve a horizontal force acting on an object in an incline plane into a parallel force?
A particle of weight $W$ Newtons is supported on a smooth inclined plane by two forces each equal in
magnitude to half the weight, one acting horizontally and the other acting parallel to the plane.
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Some questions regarding a pulley [closed]
Please have a look at the following diagram sketched by my Professor. The points $P_1$ and $P_2$ have mass $m_1$ and $m_2$ respectively . The pulley is frictionless and it is represented by a ...
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Why can we treat a ball as a point mass to calculate torque?
A sphere of radius $R$ is supported by a rope attached to a wall as shown in the below figure. The rope makes an angle $\theta$ with respect to the wall. The point where the rope is attached to the ...
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A paradox while explaining the equilibrium of books
An even number of books (say four) are held in the manner shown in the figure. It is obvious that if we apply a large force inwards, we can increase the normal force, and hence the friction which ...
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Tension of rope over frictionless edge obstructing block
Consider the diagram below. All corners are assumed to have no friction. Is it true that the tension throughout the rope is equal in all sections? The section over the edge of the building, the ...
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When an object is thrown towards the sky it starts to gain potential energy, why?
I didn't think so because when an object is thrown towards the sky it already has kinetic energy and it looses it's energy due to the gravitational force of the earth.
When the object looses all of it'...
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Tension in Atwood machine revisited
In their book "Theoretical Mechanics of Particles and Continua", Fetter and Walecka ask to solve the problem (problem 1.3 of Chapter 1) of an Atwood machine in which a massless string is ...
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Condition for a car moving with a constant velocity [closed]
I seek your help with this simple yet confusing problem. The question says:
A car is moving with a constant velocity 10m/s. Which one is correct?
No force is acting on the car
The force applied by ...
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