Calculating Int. Forces: Why the Difference?

In summary, if two boxes of different masses are pushed on different ends with the same force, the internal forces between them will differ. This means that if the mass of one box is larger than the other, the force required to push the larger box will be less than the force required to push the smaller box. This may seem counterintuitive, but it is due to the fact that the total mass being accelerated is the same in both cases. This concept can be confusing, but it is important to understand in order to fully comprehend the physics behind it.
  • #1
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I know that you can calculate that if two boxes next to each other of different masses are pushed on end 1 and on end 2 with the same force have different internal forces... But I can't think of the physical meaning why?
 
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  • #2
I have absolutely no idea what you mean by "different internal forces". Perhaps it would help if you told us what you mean by "end 1" and "end 2".


I might guess that you mean you have two boxes, of masses m1[/sup] and m2 abutting and by "pushed on end 1 and end 2" you mean on the one hand pushing on box of mass m1 so that both move or on the other pushing on the box of mass m2 so that they both move.

The obvious points are: Either way, since you are accelerating the same mass, m1+ m2, in the same way, you must apply the same force. However, is m1 < m2, the force that box m2 must apply to it, it you are pushing on box m2, is less than the force box m1 must apply to box m2 if you are pushing on box m1.
 
  • #3
yikes... i should brush up on my english! thank you for trying to understand my broken english and helping me with my problems!
 

FAQ: Calculating Int. Forces: Why the Difference?

How do you calculate internal forces?

Internal forces can be calculated using the formula F = ma, where F represents the force, m represents the mass, and a represents the acceleration. It is important to also consider the direction of the forces when calculating.

What is the difference between internal and external forces?

Internal forces act within an object, while external forces act on an object from outside. Internal forces are typically the result of interactions between different parts of an object, while external forces can be caused by factors such as gravity, friction, or applied forces.

Why is it important to calculate internal forces?

Calculating internal forces allows scientists and engineers to understand the stress and strain placed on an object, which is crucial for designing and building structures that can withstand these forces. It also helps in predicting the behavior of objects under different conditions.

What factors can affect internal forces?

Internal forces can be affected by a variety of factors, such as the material properties of an object, its shape and size, and the external forces acting on it. Temperature, pressure, and environmental conditions can also play a role in determining internal forces.

How can internal forces be reduced?

Internal forces can be reduced by redistributing the stress and strain within an object, increasing its strength and stiffness, or by adding external supports. Designing structures with the appropriate materials and dimensions can also help to minimize internal forces.

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