Resultant force Definition and 172 Threads

In physics and engineering, a resultant force is the single force and associated torque obtained by combining a system of forces and torques acting on a rigid body. The defining feature of a resultant force, or resultant force-torque, is that it has the same effect on the rigid body as the original system of forces. Calculating and visualizing the resultant force on a body is done through computational analysis, or (in the case of sufficiently simple systems) a free body diagram.
The point of application of the resultant force determines its associated torque. The term resultant force should be understood to refer to both the forces and torques acting on a rigid body, which is why some use the term ' resultant force-torque.

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  1. N

    What is the Pressure and Resultant Force at the Bottom of the Tub?

    Homework Statement ( athmosphere pressure is normal 101 kPa) A ”tub” has a form as a prism ( like on the pic ) with the following lengths Length: 2m Width : 0,75m height: 0,5m Whats the absolute pressure agains the sides at the bottom of the “tub” + resultant force Homework...
  2. L

    Calculating the resultant force .

    calculating the resultant force... Use a suitable graphical method to determine the magnitude and direction of the resultant force acting the anchor point of two cables under tension as shown...
  3. R

    Vector Addition - Find Angle of Resultant Force

    [SOLVED] Vector Addition Homework Statement Find the angle between two vector forces of equal magnitude, such that the resultant is one-third as much as either of the original forces.Homework Equations Pythagorean Theorom, I assumeThe Attempt at a Solution This is from Schaum's 3000 Problems...
  4. D

    Resultant Force for circular motion on a banked track

    [SOLVED] Resultant Force for circular motion on a banked track Homework Statement A car travels 77 m/s around a circular track of radius 71.9 mass of car= 2800 kg coefficient of friction = .1 angle of track with horizontal = 22 degrees acceleration of gravity = 9.8 m/s^2 What is the...
  5. J

    What Is the Resultant Force Exerted by a Car on the Road?

    [SOLVED] Resultant force on a car Homework Statement A 1070 kg car is pulling a 320 kg trailer. Together the car and trailer move forward with an acceleration of 2.01 m/s2. Ignore any frictional force of air drag on the car and all frictional forces on the trailer. Determine the following. (a)...
  6. J

    What is the resultant force direction?

    Homework Statement A 33 N force acts on an object at 30 degrees West of South while a 17 N force acts on the same object at 30 degrees North of West. What is the resultant force and direction. Force1= 33 N Force 2= 17 N Homework Equations Force diagram? Cos? The Attempt at a...
  7. R

    Adding Vectors and Calculating Resultant Force

    adding vectors and getting their resultants are Quite easy but understanding the problem is not.. in my problem it says that three of the forces are 100N, 60 degrees above the x axis; 200N, 140 degrees above the x-axis and 250N, 320 degrees above the x axis..The resultant is 100N along the...
  8. Saladsamurai

    Law of sine/cosines to find resultant force

    Homework Statement So I am using Law of sine/cosines to find resultant force R and its direction. My teacher gave me a hint to decompose the 600 and 800 into x and y components...but I have done this and cannot see what it helps me to derive? Anyone else see it? Casey Also, I have drawn...
  9. Saladsamurai

    How can I find the resultant force using only the law of cosines and sines?

    Homework Statement Okay, I am only allowed to use law of cosines and sones to find the resultant force F_r I am having a hell of a time finding a usable angle after drawing my parellelogram..so obviously I am in need of sleep. What am I missing here? (pic is clickable) Casey
  10. S

    Calculating the resultant force using vector

    Please HELP! I need help with a question...I don't know how to do it...can someone please tell me how. This question is about calculating the resultant force using vectors. Question: There is a parachutist with a 500 N force acting upwards on him and a 1000 N force acting downwards on him...
  11. N

    Finding the Resultant Force to Using Vector Components and Trigonometry

    What type of equation would I use to find the resultant force? Do I just add the vectors together? Or change them to X and Y variable?
  12. J

    How to Calculate Average Resultant Force?

    [SOLVED] Average Resultant Force Hi for this question http://tinyurl.com/3cbxlq What I try is Average Force =(mv-mu)/t =2000(6-4)/4 =1000 but this is not one of the answers. Meaning it is wrong. May I know how to do this question?
  13. M

    What Is the Resultant Force When Two People Pull on Ropes Attached to an Object?

    two ropes are attatched to a heavy object. the ropes are given to two strong people with instructions for each to pull with 1000N of force. what is the total resultant force if the two women pull.. in the same direction_________F=2000N in opposite direction__________F=0N at right angles...
  14. B

    Resultant Force magnitude of the acceleration.

    I can't seem to figure this problem out... Three forces in the x-y plane act on a 3.70 kg mass: 14.50 N directed at 478.0°, 11.00 N directed at 117.0°, and 10.70 N directed at 222.0°. All angles are measured from the positive x-axis, with positive angles in the counter-clockwise direction...
  15. T

    What is the formula for determining the resultant force on a charge?

    Homework Statement 1. A charge A of -5 µC has two nearby charges: +3.0 µC at a distance 0.3 m vertically above it, and +4.0 µC at a distance of 0.4 m horizontally. Find the magnitude of the force in Newton on charge A. Hint: find the vertical and horizontal components, then add these vectors...
  16. M

    How Do You Calculate the Force Needed to Move a Block Across the Ground?

    Homework Statement Hi, The question I am a bit confused about is this: A block is dragged across the ground by a light cable,attached to a winch. Th block is initally at rest. Information given: Volume: 6m³ Density 2875 kg/m³ Coefficent of friction between block and the ground: 0.4...
  17. A

    Calculate Resultant Force of Charges on Rectangle

    http://img424.imageshack.us/img424/6972/showmeks9.gif Four charges are placed on the corners of a rectangle. What is the resultant force on the positive charge (a = 1.1 m, b = 0.7 m, q = 2.4 × 10-9C)? So you need to break this into X and Y, for Hypotnuse i got 1.303 So wat i did...
  18. K

    Magnitude and direction of the resultant force

    1. Three ropes are tied to a box and three boys exert the following forces: F1=220 N @ 90 degrees F2=185 N @ 165 degrees F3=235 N @280 degrees Determine the magnitude and direction of the resultant force. For my solution I made a Vector Componant table, found the total force on the x...
  19. C

    Calculate Resultant Force on Positive Charge in Rectangle with 4 Charges

    Four charges are placed on the corners of a rectangle. What is the resultant force on the positive charge (a = 1.3 m, b = 0.8 m, q = 1.8 × 10-9C)? HELP: Use Coulomb's law and superposition. HELP: Superposition tells us that we can find the force on the positive charge by looking at the...
  20. G

    How do i workout the resultant force and direction?

    The angle between a 40N Force and a 70N is 60 degrees...how do i workout the resultant force and direction?
  21. K

    Determine the magnitude and direction of the resultant force

    Three forces act simultaneously on point J. One force is 20.0 N north; the second is 20.0 N west; the third is 20.0 N 60° east of north. Determine the magnitude and direction of the resultant force. I need help with this problem. I know you can figure this out by putting it on a graph and...
  22. K

    Calculating the Resultant Force at J

    Three forces act simultaneously on point J. One force is 20.0 N north; the second is 20.0 N west; the third is 10.0 N 60° east of north. Determine the magnitude and direction of the resultant force.
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