Does it take two forces to deform an object?

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I have a question - if 2 forces are required to deform an object then why does a piece of space junk impacting an object in space cause deformation? What is the second force?
 
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:welcome:

Who says it takes two (external) forces to deform an object? Just look at a slow-motion video of bat hitting a ball.
 
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Action and Reaction ?? :wink:
 
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Ignoring the subtleties, inertia becomes dominant for high rate processes.
 
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tomR said:
What is the second force?
Because ##F = ma##.
The first force is ##F##, the force applied by the impacting object.
The second force is ##ma##, or the mass of the object being hit multiplied by the acceleration of that object.

Frabjous said:
inertia becomes dominant for high rate processes.
Typical space junk is moving roughly ten times the velocity of a high velocity rifle bullet. That's a high rate process. The whole impact happens so fast that only the material in the immediate vicinity of the impact is affected. Space junk impact is finished punching a hole (or crater) before the material away from the impact is affected by the impact force.
 
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Related to Does it take two forces to deform an object?

What does it mean to deform an object?

Deforming an object means changing its shape or size due to an applied force. This can be temporary or permanent, depending on the material and the magnitude of the force.

Can a single force deform an object?

Yes, a single force can deform an object. For example, compressing a spring or stretching a rubber band involves a single force applied to the object.

Why do people think two forces are needed to deform an object?

People often think of two forces because many deformations involve opposing forces, such as squeezing an object between two hands. However, a single force can also cause deformation, as seen in bending or stretching scenarios.

What types of materials are more likely to deform with a single force?

Materials that are elastic or ductile, such as rubber, metals, and certain plastics, are more likely to deform with a single force. These materials can stretch, compress, or bend relatively easily.

What is the difference between elastic and plastic deformation?

Elastic deformation is temporary and reversible; the object returns to its original shape when the force is removed. Plastic deformation is permanent; the object does not return to its original shape even after the force is removed.

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