The term free body is usually associated with the motion of a free body diagram, a pictorial device used by physicists and engineers. In that context, a body is said to be "free" when it is singled out from other bodies for the purposes of dynamic or static analysis. The object does not have to be "free" in the sense of being unforced, and it may or may not be in a state of equilibrium; rather, it is not fixed in place and is thus "free" to move in response to forces and torques it may experience.
Suppose a person is walking on the ground without slipping. For the free body diagram of just the person, only the frictional force is drawn in the horizontal direction. The force exerted by the leg muscles to generate a force against the ground is considered an internal force. What would be the...
Hoping someone can chip in and help me understand a problem when it comes to two-force members.
I have a structure as shown below. Essentially its a single body attached at 3 points with pin joints. My question is, is it appropriate to treat each of the left and right side as individual...
Are we allowed to use free body diagrams in dynamic systems where there is non-negligible friction in say the rotational pivot between two linkages? If so, how to incorporate friction into the equations of motion? If not, what method allows friction to be accounted for?
In this diagram, if the system begins by being held static, and then at time ##T## release of all components occurs, at all times ##>T##, until vertical movement stops upon vertical block ##m## making contact with the Normal Force at the base of block ##M##, will the lateral acceleration of...
So, to obtain the motion equations I initially plotted the free-body diagram (see picture). Then I’ve tried to get equations, but I’m not sure, do I have done it rightl. I will be gratefull if someone could help me.
Let's say you are riding a bike very fast, and then you sharply turn into a slide (where the bike is sliding perfectly sideways).
I'm trying to calculate the angle that the bike would be leaning at, but I'm having trouble creating the free body diagram.
Right now I have the normal force and...
So I’m a high school physics teacher and I came up with the question above. However I haven’t given it to my students because I’m not sure what the answer would be.
There is a force holding the gum up, and that force must balance the force of gravity. I’d probably call that an applied force, so...
I have a question regarding a homework exercise. My professor asked me to find the radial force in the free body diagram in the image included. There is a weight Fz from above and it is assumed that it is countered by the vertical component of both the Ff (friction force) and the Fn (normal...
So basically, I got close to a zero for my solution to this problem. I'm guessing based on the posted solutions that I wasn't able to get partial credit
due to the fact that my coordinate axis was aligned with the slender bar and not in its usual perpendicular position.
This resulted in...
Hello,
When solving statics or dynamics problems, one important step is to draw the free body diagram (FBD) with all the external forces acting ON the system. The "chosen" system may be composed of a single or multiple entities. The external forces have components that must be projects on the...
I have put a picture of the problem above. The picture below shows my free body diagram. Fg is the component of the gravitational force in the direction fo the tangent at the point of contact and Ff is the frictional force between the plank and cylinder. I put Ff in the opposite direction as Fg...
To start off with, I can't seem to interpret the FBD here. Here are my drawing:
and what I interpret as.
From here, I feel like I can (it's wrong obviously but I'm not sure why) state that sin theta = o/h = o/mg = N/mg , so N= mg sin theta?
Thanks
Has anyone created a thread on Free Body Diagram on assembly having many components ? For example a Casing having premium threads in both end and a set packer within it. What would be the FBD equations to determine various forces and reaction forces
FIRST PICTURE
I have some doubts here because of the spring... I'll tell you what forces I've drawn. For ##A##, I drew the weight and the force applied by ##B## (the normal force) on the vertical axis; and the elastic force pointing to the right on the horizontal axis.
For ##B##, I drew the...
Hello everyone. I find the following problem confusing.
A board sandwiched between two boards in the figure below weighs 95.5N. If friction exists between the middle and the compressing boards, draw the free body diagram of the middle board.
Below I attached the diagram found in the solution...
Hi i am posting this to double check my work. Please help and feel free to ask any questions. I posted a picture of my work and what i currently have.
1. Homework Statement
Two small insulating objects are hung from strings attached to the ceiling. The masses of each object is 0.0076 kg. The...
Homework Statement
A mass M1 is sliding across a table with coefficient of kinetic friction μk. A string is tied to this mass and runs over a pulley, drops vertically and is tied to another mass M2 which is falling. The pulley is connected to the table by a support. The pulley is a solid...
Homework Statement
3. Consider R2D2 (a droid) with mass 30kg riding on a Ferris wheel with diameter 25m, with a velocity of 2.8m/s.
a) Compute the free body diagram for R2D2 at the exact top, exact bottom and at both horizontal positions. Remember to include gravity. (Note: The forces act in...
Homework Statement
A 2kg block is being pushed along a ceiling with friction by an angled force of 70 degrees. I'm asked only for the free body diagram.
Homework EquationsThe Attempt at a Solution
I figured both the gravitational and normal force would point downwards, but the force applied at...
On EngineersEdge.com they have a free body diagram of a scissor lift
https://www.engineersedge.com/mechanics_machines/scissor-lift.htm
Can anyone explain how the Fy, Fx components are determined? What is specifically confusing to me is how Fy is opposite in direction given the system.
To me...
Homework Statement Determine the forces acting on the two rods in the figure. Explain which stresses that act on the rods and the bolts holding the rods to the brackets in point A and C.
Homework Equations
∑Fx = 0 ∑Fy = 0 ∑Fz = 0...
Hello,Ive got a question and wondering if there is someone that could help me? I would really appreciate it!
I am studying for an exam that I am going to have in a couple of weeks and it has been going great besides that I have been stuck on a question about tension in a preloaded system with a...
Homework Statement
Homework Equations
Trying to find the reaction forces at E. But, I am kinda confused about drawing the free body diagram for each member. I know that member AD and CB are two force members. What is wrong with my free body diagram then?
The Attempt at a Solution
i...
Here I have drawn the free-body diagram for a rock (but could really be any object) which is being pulled upwards.
Fa represents the applied force (let's say...by a rope)
Fg represents gravity/weight of the object
Ff represents friciton, i.e. the small amount of air resistance
But here's my...
Imagine a long brick in outer space. You apply a force tangential to the center of mass. The brick accelerates in a transitional and angular fashion. There are no constraints or fixed axis. How would I calculate the translational and angular acceleration? I would like to run some simulations...
hi, i am studying about design the box carried on car.
i am really stuck in how to draw free body diagram for when 3 or more boxes stack together on car running and braking. there are many example with 2 boxes but i don't know why i can't find any case with 3 or more boxes
thanks in advance
I am currently performing failure analysis on an A356 Aluminum alloy wheel subjected to rotational loading, with a maximum load of 650 kgf and a torque of 4600 Nm. Cracks formed in the wheel after 1.3*10^6 rotations.
My job is to perform a stress analysis to determine the regions of maximum...
Homework Statement
Two cylinders, each with a mass of 10kg, are lying on an L profile.
Neglect the thickness and weight of the L profile.
Calculate the reaction force in b and e.
Homework Equations
G = mg
The Attempt at a Solution
So I tried to make a free body diagram of the cylinders.
I...
This is a practical issue I've trying to resolve by understanding the physics. While I talk sailing jargon, ultimately this is a question of simple torsional forces on a body.
So: In a high wind, when heeled over, my boat does what's called "rounding up"; it turns sharply into the wind -...
Homework Statement
A 500-N person stands 2.5 m from a wall against which a horizontal beam is attached. The beam is 6 m long and weighs 200N (see diagram below). A cable attached to the free end of the beam makes an angle of 45 degrees to the horizontal and is attached to the wall.
Homework...
Homework Statement
Hi, please see the attached file. I am trying to find the force as illustrated in the diagram.
Homework Equations
[/B]
The Attempt at a Solution
I've found the force for the 4deg beam and therefore the horizontal beam however I am unsure how to take into account the...
< Mentor Note -- thread moved to HH from the technical forums to use a scpecific schoolwork problem to illustrate the general concept of torque in a FBD >
I'm writing up a lab report for Physics class and I have to draw FBDs for torque being applied to a ruler resting on a pivot point. I've...
Free body diagrams are where you simplify each object to a point and draw all of the forces acting upon it.
I am having difficulty understanding it entirely and it would really help to just have a bunch of examples of free body diagrams. If you have a link to a bunch that would be great.
I...
What would the Free Body Diagram of a Trebuchet look like (FOR THE SYSTEM)? Would it be comparable to a see saw/ teeter totter? I am aware of some of the forces at play, but I feel there is some I am missing.
Homework Statement
Free body force diagram question, where I have selected the best answer but the diagram doesn't ring completely true (see diagram uploaded). I think mathematically the diagram is sufficient but it doesn't properly represent the situation. Do you agree?
Homework EquationsThe...
I was wondering if anyone can provide feedback on my free body diagram of two objects acting on each other. The question is asking for two separate free body diagrams. A force is applied to object 1, and object 1 pushes against object 2. Object 1 is on wheels and object 2 is in contact with the...
Homework Statement
Homework EquationsThe Attempt at a Solution
I got the components of each force. I called the Force from BA "B" and the force from CA "C" and then the force going downward on D "W"
FBy=sin30*B
FBx=-cos30*B
FCy=3/5*C
FCx=4/5*C
W=-500
~~~~~~
ΣFx= -B*cos30 + 4/5C = 0
ΣFy=...
Homework Statement
A positive charge Q1 = 7.4 μC is located at a point X1 = -2 m, a negative charge Q2 = -9.7 μC is located at a point X2 = 3 m and a positive charge Q3 = 2.1 μC is located at a point X3 = 9 m.
Draw free body diagrams for the electric force acting on Q1, Q2 and Q3.
Find the...
Homework Statement
A positive charge Q1=7.4uC is located at a point X1=-2 m, a negative charge Q2=-9.7uC is located at a point X2=3m and a positive Q3=2.1uC is located at a point X3=9
A. Draw a free body diagram for the electric force acting on Q1, Q2, and Q3.
B. Find the magnitude of the force...
Homework Statement
A 250 kg box slides down the ramp and then across a level floor. The coefficient of kinetic friction along the floor is 0.20. A person see the box moving at 1.0 m/s(left) and pushes on it with a horizontal force of 140 N (right). How far does the box travel before coming to...
Hi everyone,
I am an electromechanical engineering student. The last few days I am trapping into some confusion about some things. I am just going to state my question underneath.
Question:
First question:
As they learned me at the university. When you draw a free body diagram it doesn't mind...
In the above cases I want to find the acceleration a for m1. I can do it by considering m1 and m2 to be a system, which would give me a = F/(m1+m2). How can I use a free-body diagram instead to calculate the acceleration? Using a free-body diagram, m2 only affects the vertical motion by exerting...
Homework Statement
Homework Equations
relevant equations are provided with each question below
The Attempt at a Solution
please check my solutions to ensure they are correct. thanks.
a) [/B]
b)
Calculate net force:
Fnet = FA + Ff + Fg
Fnet = (1.20 x 104 N [up]) + (1.40 x 103 N [down])...
Homework Statement
The context of this problem involves a dolly pulling a trailer, and I am trying to establish the basic free body diagram for the trailer. Is what is done so far acceptable and is this a step in the right direction?
Homework EquationsThe Attempt at a Solution
I am confident...
Homework Statement
Assuming no friction is on the plane or the pulleys and the pulley and rope have negligible mass... Determine the acceleration of each block and the tension in each cord. Block A weighs 100kg, Block B weighs 300kg.
Homework Equations
ΣF = ma
ma = 100kg
mb = 300kg
The...
1. Homework Statement
Given the picture, find theta, and the magnitude of the force going from point A to B.
I have asked multiple people how to solve this problem and they have no idea, I end up getting 2 equations with 2 unknowns but then when I try to solve for theta I get 70cos(theta) -...
Homework Statement
A car attempts to accelerate up a hill at an angle θ to the horizontal. The coefficient of static friction between the tires and the hill is µ > tan θ. What is the maximum acceleration the car can achieve (in the direction upwards along the hill)? Neglect the rotational...