FBD of cabinet moving on truck

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In summary, the conversation discusses the location of the normal force in a free body diagram. It is explained that the normal force does not necessarily have to pass through the center of mass, but only needs to be normal to the common surface between the two bodies. The location of the normal force is determined through a moment calculation and is equivalent to the distributed force across the bottom of the block.
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xzibition8612
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Homework Statement



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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.
 

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Nothing says that the normal force must be below the CM. It only has to be normal to the common surface between the two bodies. If you look at how they determined the location of the normal, it was located by means of a moment calculation, in order to get the sum of moments to balance.

In truth, the normal force is distributed across the bottom of the block. It will be very slight at the right edge, and much heavier at the left edge, with higher values where there is a high spot in the contact surface, etc. All they have done is to locate the effective, concentrated normal force. This is a fictitious, single force, equivalent to the distributed force that is actually there.
 

Related to FBD of cabinet moving on truck

What is the concept of FBD in relation to a cabinet moving on a truck?

FBD stands for Free Body Diagram, which is a visual representation of all the forces acting on an object. In the case of a cabinet moving on a truck, the FBD shows the forces of gravity, normal force, friction, and any external forces acting on the cabinet.

What forces are involved in the FBD of a cabinet moving on a truck?

The forces involved in the FBD of a cabinet moving on a truck are gravity, normal force, and friction. Gravity pulls the cabinet downwards, the normal force from the truck bed counteracts the weight of the cabinet, and friction between the cabinet and the truck bed prevents the cabinet from sliding off the truck.

How does the weight of the cabinet and the truck affect the FBD?

The weight of the cabinet and the truck are important factors in the FBD as they determine the magnitude and direction of the forces acting on the cabinet. The weight of the cabinet provides the force of gravity, and the weight of the truck provides the normal force that keeps the cabinet from falling through the truck bed.

What is the role of friction in the FBD of a cabinet moving on a truck?

Friction plays a crucial role in the FBD of a cabinet moving on a truck. It is the force that opposes the motion of the cabinet and prevents it from sliding off the truck. Friction is created by the contact between the cabinet and the truck bed and is affected by the weight of the cabinet, the surface of the truck bed, and any external forces.

How can the FBD of a cabinet moving on a truck be used in real-life applications?

The FBD of a cabinet moving on a truck can be used in real-life applications to analyze and predict the forces acting on the cabinet. This can help in determining the appropriate weight and size of the cabinet to be transported, as well as the type of truck and surface needed to safely transport the cabinet. It can also be used to identify any potential issues or risks in the transportation process.

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