Fbd Definition and 107 Threads

Dear friends... During the last months I am puzzled by the following problem and I would like to kindly ask for your assistance, There is a device that I am trying to analyse and although the results do make some sense it seems that the experiments that I have done fail to replicate...

Homework Statement I want to find all acting forces on a hot air balloon rising form the ground. Volume and mass of balloon are given. Homework Equations F=mg F_{b}=ρVg The Attempt at a Solution Here is my free-body diagram; There are three acting forces: 1) F_1 = mg...

Homework Statement The forearm weighs 20.0 N and has a center of gravity in the position shown in the diagram. The person is pushing DOWN on the weight scale shown in the picture. If the reading on the scale is 70 N, calculate the tension, M, in the triceps muscle. I understand how this...

I have a FBD I'm not quite sure about. I attached what i have along with the original picture. 2 pin supports plus the other one on the hydraulic jack. How does it look? Here's my problem: The chute of a concrete truck for delivering wet concrete to a construction site is shown. The length of...

Homework Statement A bird sits in a birdfeeder suspended from a tree by a wire, as shown in the diagram below. Let WB and WF be the weight of the bird and the feeder respectively. Let T be the tension in the wire and N be the normal force between the bird and the feeder. Which of the...

Homework Statement A box is lifted by a magnet suspended from the ceiling by a rope attached to the magnet as illustrated in Fig 3.65. Draw free body diagram for the box and for the magnet so the picture is basically there is a ceiling , and the rope hanging from the ceiling to the...

Calculate the tension in the cable connecting the two masses. Assume all surfaces are frictionless. FBD m1 = 5 kg θ1 = 60° m2 = 6 kg θ2 = 70° Equation 1 ~ FT - Fg = ma FT - mgSinθ = ma FT = 5a + 5(9.8)Sin60 FT = 5a + 42.44 Equation 2 ~ Fg - FT = ma...

Homework Statement A superhero and his sidekick are hanging motionless from a rope. The superhero’s mass is 90.0kg, while the sidekick’s mass is Homework Equations The Attempt at a Solution i tried drawing it out, but not sure so I divided the rope into two points, one on...

Homework Statement I have this system (attached) which I need to model using simulink (attached). Homework Equations My available variables/constants are: y, y', tita, tita dot, tita double dot, m=0.1, c=0.1, k=300, l=0.3. I derived the following equations from the free body diagrams; y =...

Ok so here is the issue I'm having: For problems with inclined planes I have always broken the Fg force down into its components: Fgy= mgcos(theta) Fgx = mgsin(theta) Usually the Fnety= Fgy+ Fn(there is no motion in the Y direction for let's say a car going around a banked curve)...

Homework Statement http://img59.imageshack.us/img59/493/capturemml.png The Attempt at a Solution Here is my attempt. I assumed that both the man and the box would slide down the incline. (The box is the left diagram and the man is on the right)...

here is the scenario: there are 2 blocks A & B, both have the same mass 'm'. block A is kept on an endless surface. there is no friction between the block A and the surface. now the other block, B, is kept on top of the block A. the coeff of friction between A & B is say 'u'. the limiting...

Homework Statement Here is a picture of the problem with the free body diagram: http://dl.dropbox.com/u/64325990/HW%20Pictures/problem101.PNG I am confused about why the free body diagram has the force vector in the direction of the aθ. When I did it I thought the force that the rod...

Homework Statement See attachment Homework Equations The Attempt at a Solution My only question concerns the free body diagram. Why is the line of action of N not go through the mass center? I'm very confused about this. Any help is appreciated thanks.

Homework Statement See attachment. Homework Equations The Attempt at a Solution My only question concerns the free body diagram. In the attachment, is the F pointing to the right friction or force of the truck accelerating? Why is the line of action of N not go through the mass...

http://imageshack.us/photo/my-images/440/49789320.png/ Assuming the indicated direction of motion, why is friction acting as shown in the tangential direction? Shouldn't it be acting in the opposite direction?

Homework Statement A stone is tied to a rope. The rope is spun vertically clockwise in circular motion. The rope has a constant speed. Draw four free-body diagrams of the stone when the angle between the rope and the positive x-axis is 0, 90, 180, and 270 degrees. 2. The attempt at a solution...

Okay on question two i can only get as far as drawing fbd for the particle. I realize I need to get sin/cos for tan but don't really know how to get there. question three i have no idea. I don't understand. if the string is at an angle then does that mean tension has two components? If so...

Homework Statement A man having a weight of 150 lb supports himself by means of the cable and pulley shown in the figure. If the seat has a weight of 15 lb, determine the force that must be exerted on cable at A, and the normal force the man exerts on the seat. Answers provided by the...

Homework Statement I need to make a free body diagram of an object being twirled around on a string in a circular motion. What forces are acting on it and what are there equations? For example I know that the force of gravity is acting on the string so I am showing the Fg = mg equation on my...

Homework Statement A person is holding onto 2 separate rings and each at angle is 85 degrees. find the tension in each rope. The mass of the person is 70kg. so we know the mass of the person, and the angle of ropes, i should be able to figure it out by looking at a FBD but i don't know how the...

Homework Statement A crate is carried in a truck traveling horizontally at 15m/s. If the coeff of static friction between the crate and the truck is 0.40, determine the min. stopping distance for the truck such that the crate will not slide on the truck. Homework Equations Newton's Laws...

Homework Statement http://img576.imageshack.us/img576/5773/67450733.jpg Suppose three blocks as stacked as shown on a floor which I forgot to draw and assume it is frictionless. Draw a free-body diagram for each mass Now I know my FBD is wrong because it is a misconception of Newton's third...

Homework Statement A student proposes to study the gravitational force by suspending 2 100 kg sperical objects at the lower ends of cables from the ceiling of a tall cathedral and measuring the deflection of the cables from the vertical. The 45 m long cables are attatched to the ceiling 1m...

Homework Statement The first part is a donkey is pulling a cart with zero acceleration and I've found the coefficient of kinetic friction in the bearings and the wheel, and the coefficient of static friction of the donkey in the ground. Part two I'm having problems with- This time, a the...

Homework Statement I have a member that is at a 15 degree angle from the horizontal. I have a purely vertical load acting halfway along it, and an applied torque at one end. I am solving for the torque at the other end. Homework Equations Equilibrium equations. The Attempt at a...

Homework Statement First of all, thank you for taking your time to look at this. I cannot seem to figure it out! http://screencast.com/t/MzZiNjhmMzUt I may be completely wrong, but I feel like there isn't any tension... If the ship is slowing down, doesn't that mean that the string isn't...

Silly question I know, but I want to just clarify this. The actual question: A 0.45kg bug is crawling to the right along a metre-stick which is resting on the edge of a desk. If the mass of the uniform metre-stick is 0.37kg, how far from the edge of the desk can the bug crawl before the...

Hello, I have been trying to set up a free body diagram for a power screw in a horizontal application. Every example I find they are using a power screw to lift or lower a load not move it left to right. I have attached the example from the textbook, along with my work so far...

Homework Statement I want to know if I drew this free body diagram correctly. Information about the problem: 1:The truck has a load which is the black park as it goes up the incline. It doesn't have a load when it goes down the hill. 2:The truck is rear wheel driven. 3:The truck has...

Homework Statement See figure Homework Equations \sum F_{x} = 0 \sum F_{y} = 0 \sum M = 0 The Attempt at a Solution See other figure. is the FBD for my truss correct?

Homework Statement A cup is spinning around on a Lazy Susan...Homework Equations The Attempt at a Solution My question is about the perspective. The picture on my book is like this: ___________|---0.5m---\_/ ===================== So should I draw the free body...

Homework Statement A truck of mass 8000 kg is accelerating at 5.0 m/s2 up a hill of inclination 4 degrees to the horizontal The friction forces on the truck add up to 5500 N. What force does the truck exert against the road in the direction of travel? What force does the road exert on...

Hi, When drawing the FBD (ex. block on incline), and when you split a force into x and y components, where do you put theta when giving the angle of let's say, the incline? Is there a trick to this? I generally know where to put it (basic trig), but for some reason I can't use trig for some...

Homework Statement A sled weighing 100 N is held in place on a frictionless 20 degree slope by a rope attached to a stake at the top. The rope is parallel to the slope. Use the FBD diagram of the sled below to answer the following. What is the correct formula in both the x and y direction...

1. Homework Statement Obtain the pin-forces on the vertical bar BDE at the instant shown. Supply and document any additional information that my be necessary in order for this problem to have a tractable solution. 2. Homework Equations Newton's motion equations. [I'm just trying to...

Homework Statement from book "The compound beam ABC shown in the figure has a guided support at A and a fixed support at C. The beam consists of two members joined by a pin connection (i.e moment release) at B. find deflection 'del' under the load P"...

Homework Statement Find the linear and angular accelerations given that FA is the applied force. v is the current linear velocity and w is the current angular velocity. r is the radius of the stick. h is length of the stick. d is angle from the vertical axis. Homework Equations a...

This problem is not from a textbook. There is no given problem statement. Please let me know if the problem statement does not make sense. Homework Statement Model a two-wheeled system with DC motors that is meant to self-balance like a Segway if there is control. The input is the voltage...

The problem states: Construct a FBD of the system shown in 7.38(which i have attached). The beam is uniform and has a mass of 550 kg(I converted it to kN). Determine the moment M that will relieve roller A of any load. At this condition determine the resultant pin reaction at B. This is not...

Homework Statement The 4-kg uniform rod ABD is attached to the crank BC and is fitted with a small wheel that can roll without friction along a vertical slot. Knowing that at the instant shown crank BC rotates with an angular velocity of 6 rad/s clockwise and an angular acceleration of 15...

So I have this problem and I can't move on until i got this assumption cleared up. Looking at this truss If we look at the entire truss' FBD we have reactions in the x,y directions at B and a reaction in the x direction at C. Now I know by inspection that C_x and B_x are in the same...

I am trying to write a position vector for point D I originally thought that the z component was 0...but now common sense is telling me that it can't be...the rope must be sagging. Are my first to components correct or am I visualizing this incorrectly? : 8i+7j-(something)k <---or...

[SOLVED] FBD troubles Homework Statement I am looking at 3-15 (with diagram). I am having trouble since there is no angle given. I have so far -F+F_{ax}+F_{cx}=0 and in y direction F_{ay}=F{cy}. Since the y components are equal, the springs have equal unstretched lengths, can I...

I am not sure why this is not clicking... An object hangs from a spring balance. The balance registers 30 N in the air and when it is immersed in water it reads 20 N. What is the buoyant force on this object? Draw a FBD to solve this. FBD...

Here's an image of the problem I trying to do. http://img339.imageshack.us/img339/1765/torquequestionqv0.th.gif I'm wondering if there is a force exerted by the wall on the beam, and if so in which direction? I think it's pointed upward to the right, but I'm not too sure. Any help...

Homework Statement A toy duck waddles across the floor at constant speed. 1) How do the magnitubes of Fapplied and Ffriction compare? 2) If the coefficient of friction is 0.15, what is the maximum forward accelereation the duck can give itself? Homework Equations Ff = coefficient of...

Homework Statement Car being towed up incline. It makes 20deg angle to the horizontal. Goes at constant velocity. No friction. Tow rope rated at 6000N max.. will it break? Homework Equations I don't need help in whole question, its just the trig which i keep getting wrong. (i have...

Homework Statement Draw and FBD of a rubber stopper (mass) in circular horizontal motion. Be realistic here: Is the tension force on the stopper truly horizontal? This question is from an experiment where a rubber stopper is tied to a string and swung horizontally. When the question says...

Homework Statement A person is sitting on a chair. Draw force diagrams for the person, the chair, and the earth. Homework Equations Identify the third law pairs too, por favor. The Attempt at a Solution attached GIF is my attempt. what forces do i draw on the earth thanks for...