Elementary Dynamics Problem (FBD Help)

[baseballer10p]

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. (This is number 3 in the attached pdf file.)

Homework Equations

Newton's motion equations. [I'm just trying to draw the FBD(s).]

The Attempt at a Solution

These are old homework problems; our professor has already given us solutions to some of these (also attached) but he only gave the kinematics part, which I understand. I just need help drawing the rest of my FBD(s) for this problem. Help please?

Solution:

 

[Valkarie]

The pin forces at the instant shown can be determined using the following Free-Body Diagram (FBD). Since there are three pins, there will be three pin forces. Note that the pin force at point B is the sum of the reaction forces at points C and D. In the FBD below, F1, F2 and F3 represent the pin forces at points B, D and E respectively. \begin{figure}[h!]\centering\includegraphics[scale=0.7]{fbd.jpg}\caption{Free-body diagram for problem 3}\end{figure}

 

[Mene]

To solve this problem, we first need to gather the necessary information. The problem states that we need to obtain the pin-forces on the vertical bar BDE at a specific instant. In order for this problem to have a tractable solution, we need to know the mass of each object, the position and direction of each force acting on the system, and any other relevant information such as the angle of the bar BDE with respect to the ground.

Once we have all the necessary information, we can begin by drawing a free body diagram for each object involved in the problem. This will help us visualize the forces acting on each object and allow us to apply Newton's motion equations to solve for the unknown forces.

For the vertical bar BDE, we can draw a simple diagram with the bar represented as a straight line with point B at the bottom and point E at the top. We can then label the forces acting on the bar, such as the weight of the bar (mg) acting downwards at point E, and the pin-forces at points B and D.

To determine the pin-forces at points B and D, we can use the kinematics part of the problem to determine the acceleration of the bar. Once we have the acceleration, we can apply Newton's second law (F=ma) to solve for the unknown forces at points B and D.

In addition to the forces acting on the bar, we also need to consider the forces acting on any other objects involved in the problem, such as the pin at point D or any external forces acting on the system.

Overall, to solve this problem, we need to carefully consider all the forces acting on the system and apply Newton's motion equations to determine the pin-forces at points B and D on the vertical bar BDE.