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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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Mathematical expression of impulsive forces during a collision

I'm facing with problem regarding collision between bodies. Specifically, I need to understand the impulsive forces that arises during a collision. Sometime ago, I posted two questions (this and this) ...
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Downward force applied on a wedge

If a vertical (downward) force is applied on a wedge (on the sloping surface) then what would be its component in horizontal direction? It should be zero as the angle between them is 90 degrees. But ...
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Formula for would something fall over or not?

Let's say I have a 10cm x 10cm x 50 cm wooden stick that weights 5kg total. The 10cm x 10cm base is touching the floor and it protrudes from the floor 50cm which is the height of the stick. Based on ...
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How do I solve for Tension 1 and Tension 2 in this problem given the weight is 100N? [closed]

How do I solve for Tension 1 and Tension 2 in the problem? The weight is 100N. Book is BREAKING THROUGH SCIENCE 10; Page 88, Number 4 Problem Three
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help this tension problem Weight is 100N [closed]

help i dont know tension please help send help please physics gods help help help please. Thank you
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1answer
58 views

Stupid pulley question [closed]

I started self-studying physics and it's been 15 years, since I took basic mechanics in college. It seems to me that I'm unable to figure out how to rigorously derive from Newton's laws how a basic ...
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Question about pulley

I am wondering if the tension in the ropes in this situation is the same. Doesn't it matter if the other rope is pulled at an angle? Does this change the tension in the rope? For example if at one ...
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32 views

Derivation of acceleration and tension of pulley system [closed]

On this website I am considering the question that goes along with figure 30. I am going to assume downwards is negative and rightwards is positive (not to confuse upwards as the website says). The ...
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52 views

Does the rope stretch when the pulley of Atwood's machine is accelerated?

Let's say I've an Atwood's machine in which I have two point masses which are different. Now, when I accelerate the pulley, the two masses accelerate at a different rate which can be shown by ...
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Tension at extreme of a rotating rope of mass $m$

A uniform rope of mass per unit length $\lambda$, length $\ell$ is attached to shaft that is rotating at constant angular velocity $\omega$. Find the tension in the rope as a function of distance ...
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Gravitational force on a rope

If we have a rope fixed to the ceiling. How much gravitational force will the rope experience? Let's suppose the mass is $m$. Well the obvious answer is $mg$. But doesn't the part that is ...
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2answers
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Weight of a person sitting on a spring kept on a weighing machine. What is the reading shown? [closed]

In the above image, what would the scale reading be? Let scale reading be $R$. I was taught that the scale reading will always be the Normal force. Thus imagining the compression of spring to be $x$ ...
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Derive an equation for the minimum vertical distance needed by the string connected to masses to start accelerating [closed]

It would be helpful if someone could help with this problem. Let us consider a mass m1 on a horizontal surface which has friction between the mass and the surface. It is attached to another mass m2 ...
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How can I measure some forces in this experiment…? (statics)

Math and statics weakling here trying to do some... math and statics. I have an experiment where I'm trying to measure forces along 2 axes. I currently have a setup that I think might give me the data ...
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1answer
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Problem on force components [closed]

In this problem, is the direction of tension(725N) shown in the free body diagram correct? Wouldn't such a direction lead to compression instead of tension.
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1answer
36 views

How is the normal force on a banked track larger than gravity?

The formula of the vertical force of an object that is not accelerating up or down on a banked curve is: Ncos(θ) = mg There is also a centripetal force component which shows that the normal force is ...
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Will the motion in both systems be same?

In my book, the discussion in SHM is mainly about a mass hanging vertically from a spring. But there are some exercises which contain questions which involves a mass attached to a spring and the whole ...
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62 views

Why a rope grabbed by a single end seems to follow the hand that grabs it?

Context I am thinking about the physics of the movement of a rope in the context of a person running and grabbing a rope in one hand (the other end is "free", there is nothing attached). When the ...
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2answers
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What is the force of friction on the body? [duplicate]

This might seem like a stupid question, but my instructor could not give a straightforward answer. If a body is kept in contact with a completely vertical surface i.e. right angle to the ground, and ...
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Which specific law of physics is broken by the “double jump”? [closed]

So, there's a cliche in computer gaming known as a "double jump". This can be described as: A character jumps from a solid surface, and then is able to extend their jump by carrying out the jump ...
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2answers
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Work done by friction in this Case

So there is an elevator going down with a constant and the block does not slip on the wedge. We have to find the work done by friction in time t. So the answer given is $-mgvt\sin^2\theta$. What I ...
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2answers
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Why cannot we go in outer space with constant speed?

Sorry if this question is very childish for experts here. This was the question I had in school and years later it has resurfaced. I did some google search but getting the same equations of ...
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1answer
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What is the direction of the “normal force”? [closed]

What would be the direction of normal and friction forces when a rod is falling which was initially kept upright on a table?
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Friction while Rolling Without Slipping

This is an excerpt from an elementary Physics textbook ("Fundamentals of Physics" by Halliday), which describes what happens when a wheel that is "rolling without slippging" doesn't have a constant ...
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1answer
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Surface friction and Newton's third law [duplicate]

My question is regarding a specific case displaying Newton's third law. In the diagram below, a man is shown exerting a force on the wall, which in turn causes an equal and opposite reaction force ...
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3answers
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Direction of force when ball strikes an edge

From the perspective of classical mechanics, when a ball strikes an edge of a box-like-object, as shown here what is the direction of the force from the ball on the object (assuming there is no ...
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Why do you not double calculated tension when there are two tension forces? [duplicate]

So there is a weight acting at the centre of a rope causing two equal tension forces either side of it. I’m having difficulty working out why you do not double the tension calculated at the end. For ...
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Determining direction of friction in 3d problems

How to determine the direction of friction in complex problems? I can determine direction of friction in 2d problems which involve wedges and pulleys. But when it comes to 3d problems i always get ...
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How do we prove the downwards force of a massless rope on a pulley it wraps around is $2T$?

I took this picture out of one of Morin's problem books. The entire system is under the influence of gravity. The ropes are massless, and the circle is massless. The original question asks to give ...
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3answers
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How does frictional force push when we walk?

Friction is due to the attractive force between the body and the surface so how does it push us forward when we walk or in a bicycle
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5answers
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Pulley string system using conservation of string length method

my attempt $$4(x_3-c_1)+x_p=L$$ which give $4*a_3=-a_p$ such that $a_p$ acceleration of pulley how to get relation between $a_1$ and $a_2$ and $a_3$ using conversion of string and how to solve the ...
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1answer
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How exactly does does friction rotate a wheel?

All I know is that the wheel pushes the ground and the ground pushes back (friction). Pls can anyone elaborate on this process?
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Does artificial gravity based on centrifugal force stop working if you jump off the ground?

In an answer to another question of mine, concerning gravity, there was a link to a video about creation of artificial gravity, based on rotation. The question I have might be silly (or with an ...
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1answer
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How can any object move? [duplicate]

If an object A exerts a force on another object B, an equal and opposite force will be applied on object A by object B, so that means for a force to be applied on object B by object A, a force must ...
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1answer
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How do we write free body diagram for an object that is rebounding?

How do we write free body diagram for an object that is rebounding? Here's an illustrated example Let us assume that the object has an initial force. So, I want to draw free body diagram for each ...
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2answers
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Reason for neglecting frictional force in a particular type of Motion

A thin inelastic string is tightly wound on a cylinder. One of the ends of the string is attached to the above surface. Initially the whole system (string +cylinder) is held near the surface. When it ...
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2answers
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What force causes tangential acceleration? [closed]

I believe the static friction is responsible for the centripetal acceleration whereas kinetic friction is responsible for the tangential acceleration. But the answer key states otherwise and says it's ...
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If an object would be too tough to puncture while static, is it possible to pierce it while holding still and having it move toward you?

In The Lord of the Rings it is claimed that no man has the strength to pierce the skin of the giant spider Shelob. In a dramatic turn of events, Shelob lunges at Sam with such force that she pierces ...
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Why do we include $x$ in this Spring Equation?

I am currently in Physics 1 and we are learning about Energy. This may sound like a dumb question but I am currently trying to understand this. Here is the question of the problem: A 10kg block is ...
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3answers
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Attack point of buoyancy force

I have seen free body diagrams of submerged objects that show the buoyancy force acting on the centre of mass of the object. However, the buoyancy force arises due to pressure differences between the ...
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Why is the tension in a pendulum string highest when it is at the mean position?

Why does the string of a pendulum have max tension when it is at the mean position?
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2answers
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Why aren't we pushed one left/right direction when we stand closer to one side of a pool?

Why isn't it that we are pushed more one direction left or right than the other if we aren't standing in the middle of the pool/ any fluid? By pressure=mass(height)(gravitational constant) and ...
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4answers
60 views

Springs and Hooke's Law

Suppose a mass was stretching a vertical spring. Why does the mass have a velocity in its equilibrium position where the net force is 0? Note the spring is massless.
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2answers
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How is it possible to survive more than a few cm submerged underwater?

Suppose you hold your breath and dive a meter underwater. Assuming the surface area of the back of your body is approximately $1$ m$^2$, you have about $1$ tonne of weight above you. If you were out ...
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0answers
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Confusion about conservation of linear momentum in a bike

A bike is moving with some velocity.There is some frictional force between the wheels of bike and ground.Now you apply brakes and the bike stops after some time.Brakes apply a force say F on wheels ...
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2answers
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Newton's third law in a two body system

If I push on a table with some force 'f' then by newtons third law of motion the table also applies the same magnitude of force on me in the opposite direction. I get that there may be various forces ...
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1answer
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Why does the vector in the banked turn problem not point to the center?

I am currently working on the banked turn problem. I know that once you set up all the equations properly you end up with $$v^2=gR\tan{\theta}$$ I drew a little diagramm of the forces: I know that ...
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9answers
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Why do bikes hardly ever skid while braking with the front wheel?

When abruptly braking with the rear wheel on a bike, it tends to skid pretty easily. Doing the same with the front wheel is a very different experience. Instead of skidding, the bike lifts the rear ...
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Violation of law of conservation of linear momentum

A bike is moving with some velocity.There is some frictional force between the wheels of bike and ground.Now you apply brakes and the bike stops after some time.Brakes apply a force say F on wheels ...
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1answer
64 views

How do I calculate the maximum force needed to apply on the structure for it to topple over? [closed]

The structure consists of 6 parts as shown and the purpose of this structure is to be placed in construction sites to monitor the progress of works. As such, the structure will be subjected to ...