need to know about the rigid bodh diagram
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A body (or any part of it) which is currently stationary will remain stationary if the resultant force and resultant moment are zero for all the forces and couples applied on it.
Newton’s 3rd law: Each action has a reaction equal in magnitude and opposite in direction. This law provides the method used for one body (or part of a body) to interact with another body (or another part of the body).
Free-Body Diagram: A diagram of a body (or a part of it) which shows all the forces and couples applied on it, and which has all the forces and couples labeled for use in the solution of the problem is called a free-body diagram. Follow these steps to draw a free-body diagram.
1. Select the body (or part of a body) that you want to analyze, and draw it.
2. Identify all the forces and couplesthat are applied onto the body and draw them on the body. Place each force and couple at the point that it is applied.
3. Label all the forces and couples with unique labels for use during the solution process.
4. Add any relevant dimensionsonto your picture.
Composite bodies and internal forces: Forces and couples which are a result of interaction between one part of an object and another part of it will not appear in the free-body diagram of the whole object. This is due to Newton’s 3rd law. The two bodies in the following example are welded at A. When the two parts are looked at as a single body, the internal forces and couples are added together, and as a result of Newton’s third law will cancel.
Forces and couples on a free-body diagram: Each force or couple you put on a free-body diagram represents a model of how the body in the free-body diagram is effectedby its surroundings. In selecting the forces and couples that are to be applied on the free-body diagram follow these steps:
1. Identify all the forces which come from the interaction of one body with another. Many of the common supports and their effects are shown in Table 5-1 on page 184. Remember that for each way in which a support restricts the free motion of the body, a force or a moment must be applied to the body to impose the restriction on the motion.
2. Apply the weight of the body to its center of gravity (if it is uniform, then apply it to the centroid).
3. Remember that strings and cables can only pull on an object.
4. Remember that internal loads cancel out and should not be put on the free-body diagram.
5. Remember that if you have selected the direction of forces or couples of interaction on one body, then Newton’s 3rd law states that you must apply the forces or couples in the opposite direction on the other body.
Newton’s 3rd law: Each action has a reaction equal in magnitude and opposite in direction. This law provides the method used for one body (or part of a body) to interact with another body (or another part of the body).
Free-Body Diagram: A diagram of a body (or a part of it) which shows all the forces and couples applied on it, and which has all the forces and couples labeled for use in the solution of the problem is called a free-body diagram. Follow these steps to draw a free-body diagram.
1. Select the body (or part of a body) that you want to analyze, and draw it.
2. Identify all the forces and couplesthat are applied onto the body and draw them on the body. Place each force and couple at the point that it is applied.
3. Label all the forces and couples with unique labels for use during the solution process.
4. Add any relevant dimensionsonto your picture.
Composite bodies and internal forces: Forces and couples which are a result of interaction between one part of an object and another part of it will not appear in the free-body diagram of the whole object. This is due to Newton’s 3rd law. The two bodies in the following example are welded at A. When the two parts are looked at as a single body, the internal forces and couples are added together, and as a result of Newton’s third law will cancel.
Forces and couples on a free-body diagram: Each force or couple you put on a free-body diagram represents a model of how the body in the free-body diagram is effectedby its surroundings. In selecting the forces and couples that are to be applied on the free-body diagram follow these steps:
1. Identify all the forces which come from the interaction of one body with another. Many of the common supports and their effects are shown in Table 5-1 on page 184. Remember that for each way in which a support restricts the free motion of the body, a force or a moment must be applied to the body to impose the restriction on the motion.
2. Apply the weight of the body to its center of gravity (if it is uniform, then apply it to the centroid).
3. Remember that strings and cables can only pull on an object.
4. Remember that internal loads cancel out and should not be put on the free-body diagram.
5. Remember that if you have selected the direction of forces or couples of interaction on one body, then Newton’s 3rd law states that you must apply the forces or couples in the opposite direction on the other body.
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