What is Force diagram: Definition and 69 Discussions

A free body diagram consists of a diagrammatic representation of a single body or a subsystem of bodies isolated from its surroundings showing all the forces acting on it.
In physics and engineering, a free body diagram (force diagram, or FBD) is a graphical illustration used to visualize the applied forces, moments, and resulting reactions on a body in a given condition. They depict a body or connected bodies with all the applied forces and moments, and reactions, which act on the body(ies). The body may consist of multiple internal members (such as a truss), or be a compact body (such as a beam). A series of free bodies and other diagrams may be necessary to solve complex problems.

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  1. T

    Monkey force diagram and tension problem

    1. Homework Statement A 5kg monkey hangs initially at rest from two vines, A and B, as shown in the JPEG attached. Each of the vines is 10m long and has negligible mass. a) Draw a force diagram labeling all forces acting on the monkey. (do not resolve the forces into components, indicate...
  2. R

    Master Shear Force Diagrams with this Helpful Homework Example

    Homework Statement Hi, I know how to draw simple Shear Force Diagrams, but I am struggling with the example in the below picture, as it has a UDL. Homework Equations The Attempt at a Solution Normally for the solution, I should start the diagram at 26.7, then across and down...
  3. Femme_physics

    F in Friction Diagram: Explaining Opposite Force to Normal

    Whenever there's normal force there must be a force that causes it. Please explain how in this diagram of this object http://img850.imageshack.us/img850/605/aa1b.jpg Where first Free Body diagram is this: http://img534.imageshack.us/img534/9454/aa2zw.jpg Which I accept as...
  4. R

    Polygon of force diagram inclined plane

    Homework Statement Use the polygon of forces to demonstrate that the crate is in equilibrium on the slope Homework Equations No friction 1962 N crate sitting on a inclined plane 25 degree angle. The Attempt at a Solution I have drawn four forces mg = 1962 N ( 200 kg * 9.81)...
  5. H

    Balancing Forces on a Frictionless Surface: Exploring Tension and Equilibrium

    I know that if an object is moving at a constant velocity on a frictionless surface, the forces are balanced (add to 0). The only force vectors you would have are Fg and Fn going down/up. But what if an object is being dragged across a frictionless surface with a string; wouldn't there be a...
  6. N

    Is the 10N Force on the Bike Wheel Causing It to Move Backwards?

    I need to clarify the forces acting on the bike in the first fig is the 10N force spinning the wheel anti clockwise? hence the bike is moving backwards? Do the answers match the diagrams?
  7. B

    How Do You Calculate Electrostatic Force Between Charges?

    Two positive point charges, each of which has a charge of 1.5 × 10−9 C, are located at y = +0.50 m and y = −0.50 m. The Coulomb constant is 8.98755 × 10^9 N · m2/C2. a) Find the magnitude of the resultant elec- trical force on a charge of 1.0×10−9 C located at x = 0.55 m. Answer in units...
  8. P

    Simple Free Body Force Diagram + Friction Question

    I just want to check if I am doing the right thing with this force diagram. Forgetting the force of friction for the moment, if I know that the body is accelerating at 6.34ms^-2 with a mass of 6000kg; and the opposing force of mgsin3 is 3077.4N, then would the I have to add that to the...
  9. F

    Understanding Force Diagrams: Exploring Forces on Objects Connected by a Rope

    First off, this isn't a homework question, its a variation on a problem I have in one of my books. I've drawn a diagram below In the diagram, there are to objects of mass m1 and m2, which are connected by some rope, which is fed through that eyelet on the rod, which is perpendicular to...
  10. D

    What happened to the division of g in the Mach 3 force diagram problem?

    Here is an answer from a book of mine: From the force diagram we have N-mg=(\frac{mv^2}{R})e_r. The acceleration that the pilot feels is \frac{N}{m}=g+(\frac{mv^2}{R})e_r. I'm confused though; what happened to the g being divided by the last term as well?
  11. jegues

    Trouble be force diagram, verticle circle

    Hello all, I seem to be having issues drawing the correct force diagrams... The question is as follows: "A 1kg mass, attached to the end of a string, is swung in a vertical circle having radius of 0.3m. When the string makes and angle of 30 degrees below horizontal, the speed of the mass...
  12. J

    Help With Physics Problem: 3D Force Diagram

    Homework Statement So I have a physics problem which I can't do (I am in ap physics c by the way). I only need help with the idea as I cannot find anyway to do the free body diagram. So the question is "A crate slides down an inclined right-angled trough. The coefficient of kinetic friction...
  13. F

    Force diagram, tension on a rope

    Hello, "Two carts are connected by a rope and are free to move on a horizontal surface. We apply a force on the second cart. Draw a diagram of the forces that act on the two carts." the answer is: http://img238.imageshack.us/img238/4024/diagrameo3.jpg I don't understand T1 and T2 (the...
  14. T

    Determining Maximum bending moment via shear force diagram

    Homework Statement http://imagebin.ca/img/uzuDsi.jpg and by maximum it means in magnitude Homework Equations I figured the best (easiest/quickest) method would be to draw the shear force diagram. When I originally did this problem I came up with equations for M and V by dividing...
  15. J

    Bendingmoment and shearing force diagram

    I think i have successfully worked out the reactions, but do not know what to do in the second part where i have been asked to draw a bending moment and shearing force diagram.. Thanks, Joe. p.s i tried to attach an image of this but it is saying 15 posts or more... very weird system to...
  16. G

    Force Diagram Assistance - please

    Hey all. I have a practice assessment on mechanics and structures. question 1one was to calculate mathematically using the method of joint principle the magnitude and nature of the forces for all members of each frame. I have completed this part and the answers are acceptable. But for...
  17. S

    Force Diagram of Electrostatic Forces

    Homework Statement Two uniformly charged spheres are firmly fastened to and electrically insulated from frictionless pucks on an air table. The charge on sphere 2 is three times that on sphere 1. Which force diagram correctly shows the magnitude and direction of the electrostatic forces...
  18. M

    Work energy theorem force diagram

    I am working on the following problem. Susan's 13.0 kg baby brother Paul sits on a mat. Susan pulls the mat across the floor using a rope that is angled 30 degrees above the floor. The tension is a constant 31.0 N and the coefficient of friction is 0.190 . Use work and energy to find Paul's...
  19. X

    Force diagram for dynamics problem

    Hello i am having toruble with this problem. A 24 kg block is pushed along a horizontal surface with an acceleration of 2.0 m/s^2. The coeficient of friction is 0.25 and teh block starts at 1.0m/s. Find: the force being applied horizontally, the velocity after 5.0 s, and the distance moved...
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